[PATCH] Use kzalloc and rewrite null tests

[PATCH] Use kzalloc and rewrite null tests

[Julia Lawall]

The following patch removes some kzalloc-related macros and rewrites the
associated null tests to use !x rather than x == NULL.  The complete
semantic patch used for this transformation is as follows:

// <smpl>
@disable unlikely@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (unlikely(
+     !
      ptr
-      == NULL
     )) S else S1

@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
+     !
      ptr
-      == NULL
     ) S else S1

@disable unlikely@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (likely(
      ptr
-      != NULL
     )) S else S1

@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
      ptr
-      != NULL
     ) S else S1

// -----------------------------------------------------------------------

@@
expression ptr,size;
@@

- OBD_ALLOC(ptr,size)
+ ptr = kzalloc(size, GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_WAIT(ptr,size)
+ ptr = kzalloc(size, GFP_KERNEL)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR(ptr)
+ ptr = kzalloc(sizeof(*ptr), GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR_WAIT(ptr,size)
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL)
// </smpl>

[PATCH] Use kzalloc and rewrite null tests

[Julia Lawall]

The following patch removes some kzalloc-related macros and rewrites the
associated null tests to use !x rather than x = NULL.  The complete
semantic patch used for this transformation is as follows:

// <smpl>
@disable unlikely@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (unlikely(
+     !
      ptr
-      = NULL
     )) S else S1

@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
+     !
      ptr
-      = NULL
     ) S else S1

@disable unlikely@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (likely(
      ptr
-      != NULL
     )) S else S1

@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
      ptr
-      != NULL
     ) S else S1

// -----------------------------------------------------------------------

@@
expression ptr,size;
@@

- OBD_ALLOC(ptr,size)
+ ptr = kzalloc(size, GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_WAIT(ptr,size)
+ ptr = kzalloc(size, GFP_KERNEL)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR(ptr)
+ ptr = kzalloc(sizeof(*ptr), GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR_WAIT(ptr,size)
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL)
// </smpl>

[PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

This patch removes some kzalloc-related macros and rewrites the
associated null tests to use !x rather than x == NULL.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
+     !
      ptr
-      == NULL
     ) S else S1

@@
expression ptr,size;
@@

- OBD_ALLOC(ptr,size)
+ ptr = kzalloc(size, GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_WAIT(ptr,size)
+ ptr = kzalloc(size, GFP_KERNEL)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR(ptr)
+ ptr = kzalloc(sizeof(*ptr), GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR_WAIT(ptr,size)
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/staging/lustre/lustre/llite/dcache.c       |    4 -
 drivers/staging/lustre/lustre/llite/dir.c          |   48 +++++++++---------
 drivers/staging/lustre/lustre/llite/file.c         |   56 ++++++++++-----------
 drivers/staging/lustre/lustre/llite/llite_close.c  |    8 +--
 drivers/staging/lustre/lustre/llite/llite_lib.c    |   32 ++++++------
 drivers/staging/lustre/lustre/llite/llite_nfs.c    |    4 -
 drivers/staging/lustre/lustre/llite/llite_rmtacl.c |    4 -
 drivers/staging/lustre/lustre/llite/lloop.c        |    4 -
 drivers/staging/lustre/lustre/llite/namei.c        |    2 
 drivers/staging/lustre/lustre/llite/statahead.c    |   14 ++---
 drivers/staging/lustre/lustre/llite/symlink.c      |    2 
 drivers/staging/lustre/lustre/llite/xattr_cache.c  |    4 -
 12 files changed, 91 insertions(+), 91 deletions(-)

diff -u -p a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -202,8 +202,8 @@ ll_sa_entry_alloc(struct ll_statahead_in
 	char		 *dname;
 
 	entry_size = sizeof(struct ll_sa_entry) + (len & ~3) + 4;
-	OBD_ALLOC(entry, entry_size);
-	if (unlikely(entry == NULL))
+	entry = kzalloc(entry_size, GFP_NOFS);
+	if (unlikely(!entry))
 		return ERR_PTR(-ENOMEM);
 
 	CDEBUG(D_READA, "alloc sa entry %.*s(%p) index %llu\n",
@@ -465,7 +465,7 @@ static struct ll_statahead_info *ll_sai_
 	struct ll_statahead_info *sai;
 	int		       i;
 
-	OBD_ALLOC_PTR(sai);
+	sai = kzalloc(sizeof(*sai), GFP_NOFS);
 	if (!sai)
 		return NULL;
 
@@ -802,12 +802,12 @@ static int sa_args_init(struct inode *di
 	struct ldlm_enqueue_info *einfo;
 	struct md_op_data	*op_data;
 
-	OBD_ALLOC_PTR(einfo);
-	if (einfo == NULL)
+	einfo = kzalloc(sizeof(*einfo), GFP_NOFS);
+	if (!einfo)
 		return -ENOMEM;
 
-	OBD_ALLOC_PTR(minfo);
-	if (minfo == NULL) {
+	minfo = kzalloc(sizeof(*minfo), GFP_NOFS);
+	if (!minfo) {
 		OBD_FREE_PTR(einfo);
 		return -ENOMEM;
 	}
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_nfs.c b/drivers/staging/lustre/lustre/llite/llite_nfs.c
--- a/drivers/staging/lustre/lustre/llite/llite_nfs.c
+++ b/drivers/staging/lustre/lustre/llite/llite_nfs.c
@@ -106,8 +106,8 @@ struct inode *search_inode_for_lustre(st
 
 	/* Because inode is NULL, ll_prep_md_op_data can not
 	 * be used here. So we allocate op_data ourselves */
-	OBD_ALLOC_PTR(op_data);
-	if (op_data == NULL)
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data)
 		return ERR_PTR(-ENOMEM);
 
 	op_data->op_fid1 = *fid;
diff -u -p a/drivers/staging/lustre/lustre/llite/dcache.c b/drivers/staging/lustre/lustre/llite/dcache.c
--- a/drivers/staging/lustre/lustre/llite/dcache.c
+++ b/drivers/staging/lustre/lustre/llite/dcache.c
@@ -187,8 +187,8 @@ int ll_d_init(struct dentry *de)
 	if (de->d_fsdata == NULL) {
 		struct ll_dentry_data *lld;
 
-		OBD_ALLOC_PTR(lld);
-		if (likely(lld != NULL)) {
+		lld = kzalloc(sizeof(*lld), GFP_NOFS);
+		if (likely(lld)) {
 			spin_lock(&de->d_lock);
 			if (likely(de->d_fsdata == NULL)) {
 				de->d_fsdata = lld;
diff -u -p a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -163,8 +163,8 @@ static int ll_dir_filler(void *_hash, st
 
 	LASSERT(max_pages > 0 && max_pages <= MD_MAX_BRW_PAGES);
 
-	OBD_ALLOC(page_pool, sizeof(page) * max_pages);
-	if (page_pool != NULL) {
+	page_pool = kzalloc(sizeof(page) * max_pages, GFP_NOFS);
+	if (page_pool) {
 		page_pool[0] = page0;
 	} else {
 		page_pool = &page0;
@@ -638,7 +638,7 @@ static int ll_send_mgc_param(struct obd_
 	struct mgs_send_param *msp;
 	int rc = 0;
 
-	OBD_ALLOC_PTR(msp);
+	msp = kzalloc(sizeof(*msp), GFP_NOFS);
 	if (!msp)
 		return -ENOMEM;
 
@@ -751,8 +751,8 @@ int ll_dir_setstripe(struct inode *inode
 		char *param = NULL;
 		char *buf;
 
-		OBD_ALLOC(param, MGS_PARAM_MAXLEN);
-		if (param == NULL) {
+		param = kzalloc(MGS_PARAM_MAXLEN, GFP_NOFS);
+		if (!param) {
 			rc = -ENOMEM;
 			goto end;
 		}
@@ -1061,8 +1061,8 @@ static int copy_and_ioctl(int cmd, struc
 	void *copy;
 	int rc;
 
-	OBD_ALLOC(copy, size);
-	if (copy == NULL)
+	copy = kzalloc(size, GFP_NOFS);
+	if (!copy)
 		return -ENOMEM;
 
 	if (copy_from_user(copy, data, size)) {
@@ -1152,8 +1152,8 @@ static int quotactl_ioctl(struct ll_sb_i
 	} else {
 		struct obd_quotactl *oqctl;
 
-		OBD_ALLOC_PTR(oqctl);
-		if (oqctl == NULL)
+		oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
+		if (!oqctl)
 			return -ENOMEM;
 
 		QCTL_COPY(oqctl, qctl);
@@ -1173,8 +1173,8 @@ static int quotactl_ioctl(struct ll_sb_i
 		    !oqctl->qc_dqblk.dqb_curspace) {
 			struct obd_quotactl *oqctl_tmp;
 
-			OBD_ALLOC_PTR(oqctl_tmp);
-			if (oqctl_tmp == NULL) {
+			oqctl_tmp = kzalloc(sizeof(*oqctl_tmp), GFP_NOFS);
+			if (!oqctl_tmp) {
 				rc = -ENOMEM;
 				goto out;
 			}
@@ -1412,8 +1412,8 @@ lmv_out_free:
 			return -EINVAL;
 
 		lum_size = lmv_user_md_size(1, LMV_MAGIC_V1);
-		OBD_ALLOC(tmp, lum_size);
-		if (tmp == NULL) {
+		tmp = kzalloc(lum_size, GFP_NOFS);
+		if (!tmp) {
 			rc = -ENOMEM;
 			goto free_lmv;
 		}
@@ -1643,7 +1643,7 @@ free_lmm:
 		    sbi->ll_flags & LL_SBI_RMT_CLIENT)
 			return -EPERM;
 
-		OBD_ALLOC_PTR(oqctl);
+		oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
 		if (!oqctl)
 			return -ENOMEM;
 		oqctl->qc_type = arg;
@@ -1667,7 +1667,7 @@ free_lmm:
 		    sbi->ll_flags & LL_SBI_RMT_CLIENT)
 			return -EPERM;
 
-		OBD_ALLOC_PTR(check);
+		check = kzalloc(sizeof(*check), GFP_NOFS);
 		if (!check)
 			return -ENOMEM;
 
@@ -1701,11 +1701,11 @@ out_poll:
 		struct if_quotactl_18 *qctl_18;
 		struct if_quotactl *qctl_20;
 
-		OBD_ALLOC_PTR(qctl_18);
+		qctl_18 = kzalloc(sizeof(*qctl_18), GFP_NOFS);
 		if (!qctl_18)
 			return -ENOMEM;
 
-		OBD_ALLOC_PTR(qctl_20);
+		qctl_20 = kzalloc(sizeof(*qctl_20), GFP_NOFS);
 		if (!qctl_20) {
 			rc = -ENOMEM;
 			goto out_quotactl_18;
@@ -1755,7 +1755,7 @@ out_quotactl_18:
 	case LL_IOC_QUOTACTL: {
 		struct if_quotactl *qctl;
 
-		OBD_ALLOC_PTR(qctl);
+		qctl = kzalloc(sizeof(*qctl), GFP_NOFS);
 		if (!qctl)
 			return -ENOMEM;
 
@@ -1834,8 +1834,8 @@ out_quotactl:
 		struct hsm_user_request	*hur;
 		ssize_t			 totalsize;
 
-		OBD_ALLOC_PTR(hur);
-		if (hur == NULL)
+		hur = kzalloc(sizeof(*hur), GFP_NOFS);
+		if (!hur)
 			return -ENOMEM;
 
 		/* We don't know the true size yet; copy the fixed-size part */
@@ -1920,8 +1920,8 @@ out_quotactl:
 		struct hsm_copy	*copy;
 		int		 rc;
 
-		OBD_ALLOC_PTR(copy);
-		if (copy == NULL)
+		copy = kzalloc(sizeof(*copy), GFP_NOFS);
+		if (!copy)
 			return -ENOMEM;
 		if (copy_from_user(copy, (char *)arg, sizeof(*copy))) {
 			OBD_FREE_PTR(copy);
@@ -1939,8 +1939,8 @@ out_quotactl:
 		struct hsm_copy	*copy;
 		int		 rc;
 
-		OBD_ALLOC_PTR(copy);
-		if (copy == NULL)
+		copy = kzalloc(sizeof(*copy), GFP_NOFS);
+		if (!copy)
 			return -ENOMEM;
 		if (copy_from_user(copy, (char *)arg, sizeof(*copy))) {
 			OBD_FREE_PTR(copy);
diff -u -p a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -146,8 +146,8 @@ static int ll_close_inode_openhandle(str
 		goto out;
 	}
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data == NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		/* XXX We leak openhandle and request here. */
 		rc = -ENOMEM;
 		goto out;
@@ -659,7 +659,7 @@ restart:
 
 			goto restart;
 		}
-		OBD_ALLOC(*och_p, sizeof (struct obd_client_handle));
+		*och_p = kzalloc(sizeof(struct obd_client_handle), GFP_NOFS);
 		if (!*och_p) {
 			rc = -ENOMEM;
 			goto out_och_free;
@@ -811,8 +811,8 @@ ll_lease_open(struct inode *inode, struc
 		old_handle = fd->fd_och->och_fh;
 	}
 
-	OBD_ALLOC_PTR(och);
-	if (och == NULL)
+	och = kzalloc(sizeof(*och), GFP_NOFS);
+	if (!och)
 		return ERR_PTR(-ENOMEM);
 
 	op_data = ll_prep_md_op_data(NULL, inode, inode, NULL, 0, 0,
@@ -1655,7 +1655,7 @@ int ll_release_openhandle(struct dentry
 
 	LASSERT(it_open_error(DISP_OPEN_OPEN, it) == 0);
 
-	OBD_ALLOC(och, sizeof(*och));
+	och = kzalloc(sizeof(*och), GFP_NOFS);
 	if (!och) {
 		rc = -ENOMEM;
 		goto out;
@@ -1759,8 +1759,8 @@ int ll_fid2path(struct inode *inode, voi
 
 	outsize = sizeof(*gfout) + pathlen;
 
-	OBD_ALLOC(gfout, outsize);
-	if (gfout == NULL)
+	gfout = kzalloc(outsize, GFP_NOFS);
+	if (!gfout)
 		return -ENOMEM;
 
 	if (copy_from_user(gfout, arg, sizeof(*gfout))) {
@@ -1867,8 +1867,8 @@ int ll_data_version(struct inode *inode,
 		goto out;
 	}
 
-	OBD_ALLOC_PTR(obdo);
-	if (obdo == NULL) {
+	obdo = kzalloc(sizeof(*obdo), GFP_NOFS);
+	if (!obdo) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -1955,8 +1955,8 @@ static int ll_swap_layouts(struct file *
 	struct ll_swap_stack	*llss = NULL;
 	int			 rc;
 
-	OBD_ALLOC_PTR(llss);
-	if (llss == NULL)
+	llss = kzalloc(sizeof(*llss), GFP_NOFS);
+	if (!llss)
 		return -ENOMEM;
 
 	llss->inode1 = file1->f_dentry->d_inode;
@@ -2149,8 +2149,8 @@ static int ll_hsm_import(struct inode *i
 		return -EINVAL;
 
 	/* set HSM flags */
-	OBD_ALLOC_PTR(hss);
-	if (hss == NULL) {
+	hss = kzalloc(sizeof(*hss), GFP_NOFS);
+	if (!hss) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -2162,8 +2162,8 @@ static int ll_hsm_import(struct inode *i
 	if (rc != 0)
 		goto out;
 
-	OBD_ALLOC_PTR(attr);
-	if (attr == NULL) {
+	attr = kzalloc(sizeof(*attr), GFP_NOFS);
+	if (!attr) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -2341,8 +2341,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_user_state	*hus;
 		int			 rc;
 
-		OBD_ALLOC_PTR(hus);
-		if (hus == NULL)
+		hus = kzalloc(sizeof(*hus), GFP_NOFS);
+		if (!hus)
 			return -ENOMEM;
 
 		op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
@@ -2366,8 +2366,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_state_set	*hss;
 		int			 rc;
 
-		OBD_ALLOC_PTR(hss);
-		if (hss == NULL)
+		hss = kzalloc(sizeof(*hss), GFP_NOFS);
+		if (!hss)
 			return -ENOMEM;
 
 		if (copy_from_user(hss, (char *)arg, sizeof(*hss))) {
@@ -2385,8 +2385,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_current_action	*hca;
 		int				 rc;
 
-		OBD_ALLOC_PTR(hca);
-		if (hca == NULL)
+		hca = kzalloc(sizeof(*hca), GFP_NOFS);
+		if (!hca)
 			return -ENOMEM;
 
 		op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
@@ -2493,8 +2493,8 @@ ll_file_ioctl(struct file *file, unsigne
 	case LL_IOC_HSM_IMPORT: {
 		struct hsm_user_import *hui;
 
-		OBD_ALLOC_PTR(hui);
-		if (hui == NULL)
+		hui = kzalloc(sizeof(*hui), GFP_NOFS);
+		if (!hui)
 			return -ENOMEM;
 
 		if (copy_from_user(hui, (void *)arg, sizeof(*hui))) {
@@ -3229,8 +3229,8 @@ void *ll_iocontrol_register(llioc_callba
 		return NULL;
 
 	size = sizeof(*in_data) + count * sizeof(unsigned int);
-	OBD_ALLOC(in_data, size);
-	if (in_data == NULL)
+	in_data = kzalloc(size, GFP_NOFS);
+	if (!in_data)
 		return NULL;
 
 	memset(in_data, 0, sizeof(*in_data));
@@ -3618,8 +3618,8 @@ int ll_layout_restore(struct inode *inod
 
 	len = sizeof(struct hsm_user_request) +
 	      sizeof(struct hsm_user_item);
-	OBD_ALLOC(hur, len);
-	if (hur == NULL)
+	hur = kzalloc(len, GFP_NOFS);
+	if (!hur)
 		return -ENOMEM;
 
 	hur->hur_request.hr_action = HUA_RESTORE;
diff -u -p a/drivers/staging/lustre/lustre/llite/lloop.c b/drivers/staging/lustre/lustre/llite/lloop.c
--- a/drivers/staging/lustre/lustre/llite/lloop.c
+++ b/drivers/staging/lustre/lustre/llite/lloop.c
@@ -793,11 +793,11 @@ static int __init lloop_init(void)
 	if (ll_iocontrol_magic == NULL)
 		goto out_mem1;
 
-	OBD_ALLOC_WAIT(loop_dev, max_loop * sizeof(*loop_dev));
+	loop_dev = kzalloc(max_loop * sizeof(*loop_dev), GFP_KERNEL);
 	if (!loop_dev)
 		goto out_mem1;
 
-	OBD_ALLOC_WAIT(disks, max_loop * sizeof(*disks));
+	disks = kzalloc(max_loop * sizeof(*disks), GFP_KERNEL);
 	if (!disks)
 		goto out_mem2;
 
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -75,7 +75,7 @@ static struct ll_sb_info *ll_init_sbi(vo
 	class_uuid_t uuid;
 	int i;
 
-	OBD_ALLOC(sbi, sizeof(*sbi));
+	sbi = kzalloc(sizeof(*sbi), GFP_NOFS);
 	if (!sbi)
 		return NULL;
 
@@ -172,12 +172,12 @@ static int client_common_fill_super(stru
 		return -EINVAL;
 	}
 
-	OBD_ALLOC_PTR(data);
-	if (data == NULL)
+	data = kzalloc(sizeof(*data), GFP_NOFS);
+	if (!data)
 		return -ENOMEM;
 
-	OBD_ALLOC_PTR(osfs);
-	if (osfs == NULL) {
+	osfs = kzalloc(sizeof(*osfs), GFP_NOFS);
+	if (!osfs) {
 		OBD_FREE_PTR(data);
 		return -ENOMEM;
 	}
@@ -293,7 +293,7 @@ static int client_common_fill_super(stru
 	    valid != CLIENT_CONNECT_MDT_REQD) {
 		char *buf;
 
-		OBD_ALLOC_WAIT(buf, PAGE_CACHE_SIZE);
+		buf = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
 		obd_connect_flags2str(buf, PAGE_CACHE_SIZE,
 				      valid ^ CLIENT_CONNECT_MDT_REQD, ",");
 		LCONSOLE_ERROR_MSG(0x170, "Server %s does not support "
@@ -496,8 +496,8 @@ static int client_common_fill_super(stru
 	else if (sbi->ll_flags & LL_SBI_ACL)
 		valid |= OBD_MD_FLACL;
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data == NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		err = -ENOMEM;
 		goto out_lock_cn_cb;
 	}
@@ -993,8 +993,8 @@ int ll_fill_super(struct super_block *sb
 
 	CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
 
-	OBD_ALLOC_PTR(cfg);
-	if (cfg == NULL)
+	cfg = kzalloc(sizeof(*cfg), GFP_NOFS);
+	if (!cfg)
 		return -ENOMEM;
 
 	try_module_get(THIS_MODULE);
@@ -1049,14 +1049,14 @@ int ll_fill_super(struct super_block *sb
 	CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
 	       lprof->lp_md, lprof->lp_dt);
 
-	OBD_ALLOC(dt, strlen(lprof->lp_dt) + instlen + 2);
+	dt = kzalloc(strlen(lprof->lp_dt) + instlen + 2, GFP_NOFS);
 	if (!dt) {
 		err = -ENOMEM;
 		goto out_free;
 	}
 	sprintf(dt, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
 
-	OBD_ALLOC(md, strlen(lprof->lp_md) + instlen + 2);
+	md = kzalloc(strlen(lprof->lp_md) + instlen + 2, GFP_NOFS);
 	if (!md) {
 		err = -ENOMEM;
 		goto out_free;
@@ -1437,8 +1437,8 @@ int ll_setattr_raw(struct dentry *dentry
 	/* We always do an MDS RPC, even if we're only changing the size;
 	 * only the MDS knows whether truncate() should fail with -ETXTBUSY */
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data == NULL)
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data)
 		return -ENOMEM;
 
 	if (!S_ISDIR(inode->i_mode)) {
@@ -2029,7 +2029,7 @@ void ll_umount_begin(struct super_block
 	}
 	obd->obd_force = 1;
 
-	OBD_ALLOC_PTR(ioc_data);
+	ioc_data = kzalloc(sizeof(*ioc_data), GFP_NOFS);
 	if (ioc_data) {
 		obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_md_exp,
 			      sizeof(*ioc_data), ioc_data, NULL);
@@ -2251,7 +2251,7 @@ struct md_op_data *ll_prep_md_op_data(st
 		return ERR_PTR(-ENAMETOOLONG);
 
 	if (op_data == NULL)
-		OBD_ALLOC_PTR(op_data);
+		op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
 
 	if (op_data == NULL)
 		return ERR_PTR(-ENOMEM);
diff -u -p a/drivers/staging/lustre/lustre/llite/xattr_cache.c b/drivers/staging/lustre/lustre/llite/xattr_cache.c
--- a/drivers/staging/lustre/lustre/llite/xattr_cache.c
+++ b/drivers/staging/lustre/lustre/llite/xattr_cache.c
@@ -128,13 +128,13 @@ static int ll_xattr_cache_add(struct lis
 
 	xattr->xe_namelen = strlen(xattr_name) + 1;
 
-	OBD_ALLOC(xattr->xe_name, xattr->xe_namelen);
+	xattr->xe_name = kzalloc(xattr->xe_namelen, GFP_NOFS);
 	if (!xattr->xe_name) {
 		CDEBUG(D_CACHE, "failed to alloc xattr name %u\n",
 		       xattr->xe_namelen);
 		goto err_name;
 	}
-	OBD_ALLOC(xattr->xe_value, xattr_val_len);
+	xattr->xe_value = kzalloc(xattr_val_len, GFP_NOFS);
 	if (!xattr->xe_value) {
 		CDEBUG(D_CACHE, "failed to alloc xattr value %d\n",
 		       xattr_val_len);
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_close.c b/drivers/staging/lustre/lustre/llite/llite_close.c
--- a/drivers/staging/lustre/lustre/llite/llite_close.c
+++ b/drivers/staging/lustre/lustre/llite/llite_close.c
@@ -285,8 +285,8 @@ static void ll_done_writing(struct inode
 
 	LASSERT(exp_connect_som(ll_i2mdexp(inode)));
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data == NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		CERROR("can't allocate op_data\n");
 		return;
 	}
@@ -367,8 +367,8 @@ int ll_close_thread_start(struct ll_clos
 	if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CLOSE_THREAD))
 		return -EINTR;
 
-	OBD_ALLOC(lcq, sizeof(*lcq));
-	if (lcq == NULL)
+	lcq = kzalloc(sizeof(*lcq), GFP_NOFS);
+	if (!lcq)
 		return -ENOMEM;
 
 	spin_lock_init(&lcq->lcq_lock);
diff -u -p a/drivers/staging/lustre/lustre/llite/symlink.c b/drivers/staging/lustre/lustre/llite/symlink.c
--- a/drivers/staging/lustre/lustre/llite/symlink.c
+++ b/drivers/staging/lustre/lustre/llite/symlink.c
@@ -106,7 +106,7 @@ static int ll_readlink_internal(struct i
 		goto failed;
 	}
 
-	OBD_ALLOC(lli->lli_symlink_name, symlen);
+	lli->lli_symlink_name = kzalloc(symlen, GFP_NOFS);
 	/* do not return an error if we cannot cache the symlink locally */
 	if (lli->lli_symlink_name) {
 		memcpy(lli->lli_symlink_name, *symname, symlen);
diff -u -p a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
--- a/drivers/staging/lustre/lustre/llite/namei.c
+++ b/drivers/staging/lustre/lustre/llite/namei.c
@@ -624,7 +624,7 @@ static int ll_atomic_open(struct inode *
 	       dentry->d_name.len, dentry->d_name.name, dir->i_ino,
 	       dir->i_generation, dir, file, open_flags, mode, *opened);
 
-	OBD_ALLOC(it, sizeof(*it));
+	it = kzalloc(sizeof(*it), GFP_NOFS);
 	if (!it)
 		return -ENOMEM;
 
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_rmtacl.c b/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
--- a/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
+++ b/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
@@ -78,7 +78,7 @@ static struct rmtacl_ctl_entry *rce_allo
 {
 	struct rmtacl_ctl_entry *rce;
 
-	OBD_ALLOC_PTR(rce);
+	rce = kzalloc(sizeof(*rce), GFP_NOFS);
 	if (!rce)
 		return NULL;
 
@@ -184,7 +184,7 @@ static struct eacl_entry *ee_alloc(pid_t
 {
 	struct eacl_entry *ee;
 
-	OBD_ALLOC_PTR(ee);
+	ee = kzalloc(sizeof(*ee), GFP_NOFS);
 	if (!ee)
 		return NULL;
 

[PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

This patch removes some kzalloc-related macros and rewrites the
associated null tests to use !x rather than x = NULL.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression ptr;
statement S,S1;
@@

  \(OBD_ALLOC\|OBD_ALLOC_WAIT\|OBD_ALLOC_PTR\|OBD_ALLOC_PTR_WAIT\)(ptr,...);
  if (
+     !
      ptr
-      = NULL
     ) S else S1

@@
expression ptr,size;
@@

- OBD_ALLOC(ptr,size)
+ ptr = kzalloc(size, GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_WAIT(ptr,size)
+ ptr = kzalloc(size, GFP_KERNEL)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR(ptr)
+ ptr = kzalloc(sizeof(*ptr), GFP_NOFS)

@@
expression ptr,size;
@@

- OBD_ALLOC_PTR_WAIT(ptr,size)
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/staging/lustre/lustre/llite/dcache.c       |    4 -
 drivers/staging/lustre/lustre/llite/dir.c          |   48 +++++++++---------
 drivers/staging/lustre/lustre/llite/file.c         |   56 ++++++++++-----------
 drivers/staging/lustre/lustre/llite/llite_close.c  |    8 +--
 drivers/staging/lustre/lustre/llite/llite_lib.c    |   32 ++++++------
 drivers/staging/lustre/lustre/llite/llite_nfs.c    |    4 -
 drivers/staging/lustre/lustre/llite/llite_rmtacl.c |    4 -
 drivers/staging/lustre/lustre/llite/lloop.c        |    4 -
 drivers/staging/lustre/lustre/llite/namei.c        |    2 
 drivers/staging/lustre/lustre/llite/statahead.c    |   14 ++---
 drivers/staging/lustre/lustre/llite/symlink.c      |    2 
 drivers/staging/lustre/lustre/llite/xattr_cache.c  |    4 -
 12 files changed, 91 insertions(+), 91 deletions(-)

diff -u -p a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -202,8 +202,8 @@ ll_sa_entry_alloc(struct ll_statahead_in
 	char		 *dname;
 
 	entry_size = sizeof(struct ll_sa_entry) + (len & ~3) + 4;
-	OBD_ALLOC(entry, entry_size);
-	if (unlikely(entry = NULL))
+	entry = kzalloc(entry_size, GFP_NOFS);
+	if (unlikely(!entry))
 		return ERR_PTR(-ENOMEM);
 
 	CDEBUG(D_READA, "alloc sa entry %.*s(%p) index %llu\n",
@@ -465,7 +465,7 @@ static struct ll_statahead_info *ll_sai_
 	struct ll_statahead_info *sai;
 	int		       i;
 
-	OBD_ALLOC_PTR(sai);
+	sai = kzalloc(sizeof(*sai), GFP_NOFS);
 	if (!sai)
 		return NULL;
 
@@ -802,12 +802,12 @@ static int sa_args_init(struct inode *di
 	struct ldlm_enqueue_info *einfo;
 	struct md_op_data	*op_data;
 
-	OBD_ALLOC_PTR(einfo);
-	if (einfo = NULL)
+	einfo = kzalloc(sizeof(*einfo), GFP_NOFS);
+	if (!einfo)
 		return -ENOMEM;
 
-	OBD_ALLOC_PTR(minfo);
-	if (minfo = NULL) {
+	minfo = kzalloc(sizeof(*minfo), GFP_NOFS);
+	if (!minfo) {
 		OBD_FREE_PTR(einfo);
 		return -ENOMEM;
 	}
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_nfs.c b/drivers/staging/lustre/lustre/llite/llite_nfs.c
--- a/drivers/staging/lustre/lustre/llite/llite_nfs.c
+++ b/drivers/staging/lustre/lustre/llite/llite_nfs.c
@@ -106,8 +106,8 @@ struct inode *search_inode_for_lustre(st
 
 	/* Because inode is NULL, ll_prep_md_op_data can not
 	 * be used here. So we allocate op_data ourselves */
-	OBD_ALLOC_PTR(op_data);
-	if (op_data = NULL)
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data)
 		return ERR_PTR(-ENOMEM);
 
 	op_data->op_fid1 = *fid;
diff -u -p a/drivers/staging/lustre/lustre/llite/dcache.c b/drivers/staging/lustre/lustre/llite/dcache.c
--- a/drivers/staging/lustre/lustre/llite/dcache.c
+++ b/drivers/staging/lustre/lustre/llite/dcache.c
@@ -187,8 +187,8 @@ int ll_d_init(struct dentry *de)
 	if (de->d_fsdata = NULL) {
 		struct ll_dentry_data *lld;
 
-		OBD_ALLOC_PTR(lld);
-		if (likely(lld != NULL)) {
+		lld = kzalloc(sizeof(*lld), GFP_NOFS);
+		if (likely(lld)) {
 			spin_lock(&de->d_lock);
 			if (likely(de->d_fsdata = NULL)) {
 				de->d_fsdata = lld;
diff -u -p a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -163,8 +163,8 @@ static int ll_dir_filler(void *_hash, st
 
 	LASSERT(max_pages > 0 && max_pages <= MD_MAX_BRW_PAGES);
 
-	OBD_ALLOC(page_pool, sizeof(page) * max_pages);
-	if (page_pool != NULL) {
+	page_pool = kzalloc(sizeof(page) * max_pages, GFP_NOFS);
+	if (page_pool) {
 		page_pool[0] = page0;
 	} else {
 		page_pool = &page0;
@@ -638,7 +638,7 @@ static int ll_send_mgc_param(struct obd_
 	struct mgs_send_param *msp;
 	int rc = 0;
 
-	OBD_ALLOC_PTR(msp);
+	msp = kzalloc(sizeof(*msp), GFP_NOFS);
 	if (!msp)
 		return -ENOMEM;
 
@@ -751,8 +751,8 @@ int ll_dir_setstripe(struct inode *inode
 		char *param = NULL;
 		char *buf;
 
-		OBD_ALLOC(param, MGS_PARAM_MAXLEN);
-		if (param = NULL) {
+		param = kzalloc(MGS_PARAM_MAXLEN, GFP_NOFS);
+		if (!param) {
 			rc = -ENOMEM;
 			goto end;
 		}
@@ -1061,8 +1061,8 @@ static int copy_and_ioctl(int cmd, struc
 	void *copy;
 	int rc;
 
-	OBD_ALLOC(copy, size);
-	if (copy = NULL)
+	copy = kzalloc(size, GFP_NOFS);
+	if (!copy)
 		return -ENOMEM;
 
 	if (copy_from_user(copy, data, size)) {
@@ -1152,8 +1152,8 @@ static int quotactl_ioctl(struct ll_sb_i
 	} else {
 		struct obd_quotactl *oqctl;
 
-		OBD_ALLOC_PTR(oqctl);
-		if (oqctl = NULL)
+		oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
+		if (!oqctl)
 			return -ENOMEM;
 
 		QCTL_COPY(oqctl, qctl);
@@ -1173,8 +1173,8 @@ static int quotactl_ioctl(struct ll_sb_i
 		    !oqctl->qc_dqblk.dqb_curspace) {
 			struct obd_quotactl *oqctl_tmp;
 
-			OBD_ALLOC_PTR(oqctl_tmp);
-			if (oqctl_tmp = NULL) {
+			oqctl_tmp = kzalloc(sizeof(*oqctl_tmp), GFP_NOFS);
+			if (!oqctl_tmp) {
 				rc = -ENOMEM;
 				goto out;
 			}
@@ -1412,8 +1412,8 @@ lmv_out_free:
 			return -EINVAL;
 
 		lum_size = lmv_user_md_size(1, LMV_MAGIC_V1);
-		OBD_ALLOC(tmp, lum_size);
-		if (tmp = NULL) {
+		tmp = kzalloc(lum_size, GFP_NOFS);
+		if (!tmp) {
 			rc = -ENOMEM;
 			goto free_lmv;
 		}
@@ -1643,7 +1643,7 @@ free_lmm:
 		    sbi->ll_flags & LL_SBI_RMT_CLIENT)
 			return -EPERM;
 
-		OBD_ALLOC_PTR(oqctl);
+		oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
 		if (!oqctl)
 			return -ENOMEM;
 		oqctl->qc_type = arg;
@@ -1667,7 +1667,7 @@ free_lmm:
 		    sbi->ll_flags & LL_SBI_RMT_CLIENT)
 			return -EPERM;
 
-		OBD_ALLOC_PTR(check);
+		check = kzalloc(sizeof(*check), GFP_NOFS);
 		if (!check)
 			return -ENOMEM;
 
@@ -1701,11 +1701,11 @@ out_poll:
 		struct if_quotactl_18 *qctl_18;
 		struct if_quotactl *qctl_20;
 
-		OBD_ALLOC_PTR(qctl_18);
+		qctl_18 = kzalloc(sizeof(*qctl_18), GFP_NOFS);
 		if (!qctl_18)
 			return -ENOMEM;
 
-		OBD_ALLOC_PTR(qctl_20);
+		qctl_20 = kzalloc(sizeof(*qctl_20), GFP_NOFS);
 		if (!qctl_20) {
 			rc = -ENOMEM;
 			goto out_quotactl_18;
@@ -1755,7 +1755,7 @@ out_quotactl_18:
 	case LL_IOC_QUOTACTL: {
 		struct if_quotactl *qctl;
 
-		OBD_ALLOC_PTR(qctl);
+		qctl = kzalloc(sizeof(*qctl), GFP_NOFS);
 		if (!qctl)
 			return -ENOMEM;
 
@@ -1834,8 +1834,8 @@ out_quotactl:
 		struct hsm_user_request	*hur;
 		ssize_t			 totalsize;
 
-		OBD_ALLOC_PTR(hur);
-		if (hur = NULL)
+		hur = kzalloc(sizeof(*hur), GFP_NOFS);
+		if (!hur)
 			return -ENOMEM;
 
 		/* We don't know the true size yet; copy the fixed-size part */
@@ -1920,8 +1920,8 @@ out_quotactl:
 		struct hsm_copy	*copy;
 		int		 rc;
 
-		OBD_ALLOC_PTR(copy);
-		if (copy = NULL)
+		copy = kzalloc(sizeof(*copy), GFP_NOFS);
+		if (!copy)
 			return -ENOMEM;
 		if (copy_from_user(copy, (char *)arg, sizeof(*copy))) {
 			OBD_FREE_PTR(copy);
@@ -1939,8 +1939,8 @@ out_quotactl:
 		struct hsm_copy	*copy;
 		int		 rc;
 
-		OBD_ALLOC_PTR(copy);
-		if (copy = NULL)
+		copy = kzalloc(sizeof(*copy), GFP_NOFS);
+		if (!copy)
 			return -ENOMEM;
 		if (copy_from_user(copy, (char *)arg, sizeof(*copy))) {
 			OBD_FREE_PTR(copy);
diff -u -p a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -146,8 +146,8 @@ static int ll_close_inode_openhandle(str
 		goto out;
 	}
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data = NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		/* XXX We leak openhandle and request here. */
 		rc = -ENOMEM;
 		goto out;
@@ -659,7 +659,7 @@ restart:
 
 			goto restart;
 		}
-		OBD_ALLOC(*och_p, sizeof (struct obd_client_handle));
+		*och_p = kzalloc(sizeof(struct obd_client_handle), GFP_NOFS);
 		if (!*och_p) {
 			rc = -ENOMEM;
 			goto out_och_free;
@@ -811,8 +811,8 @@ ll_lease_open(struct inode *inode, struc
 		old_handle = fd->fd_och->och_fh;
 	}
 
-	OBD_ALLOC_PTR(och);
-	if (och = NULL)
+	och = kzalloc(sizeof(*och), GFP_NOFS);
+	if (!och)
 		return ERR_PTR(-ENOMEM);
 
 	op_data = ll_prep_md_op_data(NULL, inode, inode, NULL, 0, 0,
@@ -1655,7 +1655,7 @@ int ll_release_openhandle(struct dentry
 
 	LASSERT(it_open_error(DISP_OPEN_OPEN, it) = 0);
 
-	OBD_ALLOC(och, sizeof(*och));
+	och = kzalloc(sizeof(*och), GFP_NOFS);
 	if (!och) {
 		rc = -ENOMEM;
 		goto out;
@@ -1759,8 +1759,8 @@ int ll_fid2path(struct inode *inode, voi
 
 	outsize = sizeof(*gfout) + pathlen;
 
-	OBD_ALLOC(gfout, outsize);
-	if (gfout = NULL)
+	gfout = kzalloc(outsize, GFP_NOFS);
+	if (!gfout)
 		return -ENOMEM;
 
 	if (copy_from_user(gfout, arg, sizeof(*gfout))) {
@@ -1867,8 +1867,8 @@ int ll_data_version(struct inode *inode,
 		goto out;
 	}
 
-	OBD_ALLOC_PTR(obdo);
-	if (obdo = NULL) {
+	obdo = kzalloc(sizeof(*obdo), GFP_NOFS);
+	if (!obdo) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -1955,8 +1955,8 @@ static int ll_swap_layouts(struct file *
 	struct ll_swap_stack	*llss = NULL;
 	int			 rc;
 
-	OBD_ALLOC_PTR(llss);
-	if (llss = NULL)
+	llss = kzalloc(sizeof(*llss), GFP_NOFS);
+	if (!llss)
 		return -ENOMEM;
 
 	llss->inode1 = file1->f_dentry->d_inode;
@@ -2149,8 +2149,8 @@ static int ll_hsm_import(struct inode *i
 		return -EINVAL;
 
 	/* set HSM flags */
-	OBD_ALLOC_PTR(hss);
-	if (hss = NULL) {
+	hss = kzalloc(sizeof(*hss), GFP_NOFS);
+	if (!hss) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -2162,8 +2162,8 @@ static int ll_hsm_import(struct inode *i
 	if (rc != 0)
 		goto out;
 
-	OBD_ALLOC_PTR(attr);
-	if (attr = NULL) {
+	attr = kzalloc(sizeof(*attr), GFP_NOFS);
+	if (!attr) {
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -2341,8 +2341,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_user_state	*hus;
 		int			 rc;
 
-		OBD_ALLOC_PTR(hus);
-		if (hus = NULL)
+		hus = kzalloc(sizeof(*hus), GFP_NOFS);
+		if (!hus)
 			return -ENOMEM;
 
 		op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
@@ -2366,8 +2366,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_state_set	*hss;
 		int			 rc;
 
-		OBD_ALLOC_PTR(hss);
-		if (hss = NULL)
+		hss = kzalloc(sizeof(*hss), GFP_NOFS);
+		if (!hss)
 			return -ENOMEM;
 
 		if (copy_from_user(hss, (char *)arg, sizeof(*hss))) {
@@ -2385,8 +2385,8 @@ ll_file_ioctl(struct file *file, unsigne
 		struct hsm_current_action	*hca;
 		int				 rc;
 
-		OBD_ALLOC_PTR(hca);
-		if (hca = NULL)
+		hca = kzalloc(sizeof(*hca), GFP_NOFS);
+		if (!hca)
 			return -ENOMEM;
 
 		op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
@@ -2493,8 +2493,8 @@ ll_file_ioctl(struct file *file, unsigne
 	case LL_IOC_HSM_IMPORT: {
 		struct hsm_user_import *hui;
 
-		OBD_ALLOC_PTR(hui);
-		if (hui = NULL)
+		hui = kzalloc(sizeof(*hui), GFP_NOFS);
+		if (!hui)
 			return -ENOMEM;
 
 		if (copy_from_user(hui, (void *)arg, sizeof(*hui))) {
@@ -3229,8 +3229,8 @@ void *ll_iocontrol_register(llioc_callba
 		return NULL;
 
 	size = sizeof(*in_data) + count * sizeof(unsigned int);
-	OBD_ALLOC(in_data, size);
-	if (in_data = NULL)
+	in_data = kzalloc(size, GFP_NOFS);
+	if (!in_data)
 		return NULL;
 
 	memset(in_data, 0, sizeof(*in_data));
@@ -3618,8 +3618,8 @@ int ll_layout_restore(struct inode *inod
 
 	len = sizeof(struct hsm_user_request) +
 	      sizeof(struct hsm_user_item);
-	OBD_ALLOC(hur, len);
-	if (hur = NULL)
+	hur = kzalloc(len, GFP_NOFS);
+	if (!hur)
 		return -ENOMEM;
 
 	hur->hur_request.hr_action = HUA_RESTORE;
diff -u -p a/drivers/staging/lustre/lustre/llite/lloop.c b/drivers/staging/lustre/lustre/llite/lloop.c
--- a/drivers/staging/lustre/lustre/llite/lloop.c
+++ b/drivers/staging/lustre/lustre/llite/lloop.c
@@ -793,11 +793,11 @@ static int __init lloop_init(void)
 	if (ll_iocontrol_magic = NULL)
 		goto out_mem1;
 
-	OBD_ALLOC_WAIT(loop_dev, max_loop * sizeof(*loop_dev));
+	loop_dev = kzalloc(max_loop * sizeof(*loop_dev), GFP_KERNEL);
 	if (!loop_dev)
 		goto out_mem1;
 
-	OBD_ALLOC_WAIT(disks, max_loop * sizeof(*disks));
+	disks = kzalloc(max_loop * sizeof(*disks), GFP_KERNEL);
 	if (!disks)
 		goto out_mem2;
 
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -75,7 +75,7 @@ static struct ll_sb_info *ll_init_sbi(vo
 	class_uuid_t uuid;
 	int i;
 
-	OBD_ALLOC(sbi, sizeof(*sbi));
+	sbi = kzalloc(sizeof(*sbi), GFP_NOFS);
 	if (!sbi)
 		return NULL;
 
@@ -172,12 +172,12 @@ static int client_common_fill_super(stru
 		return -EINVAL;
 	}
 
-	OBD_ALLOC_PTR(data);
-	if (data = NULL)
+	data = kzalloc(sizeof(*data), GFP_NOFS);
+	if (!data)
 		return -ENOMEM;
 
-	OBD_ALLOC_PTR(osfs);
-	if (osfs = NULL) {
+	osfs = kzalloc(sizeof(*osfs), GFP_NOFS);
+	if (!osfs) {
 		OBD_FREE_PTR(data);
 		return -ENOMEM;
 	}
@@ -293,7 +293,7 @@ static int client_common_fill_super(stru
 	    valid != CLIENT_CONNECT_MDT_REQD) {
 		char *buf;
 
-		OBD_ALLOC_WAIT(buf, PAGE_CACHE_SIZE);
+		buf = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
 		obd_connect_flags2str(buf, PAGE_CACHE_SIZE,
 				      valid ^ CLIENT_CONNECT_MDT_REQD, ",");
 		LCONSOLE_ERROR_MSG(0x170, "Server %s does not support "
@@ -496,8 +496,8 @@ static int client_common_fill_super(stru
 	else if (sbi->ll_flags & LL_SBI_ACL)
 		valid |= OBD_MD_FLACL;
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data = NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		err = -ENOMEM;
 		goto out_lock_cn_cb;
 	}
@@ -993,8 +993,8 @@ int ll_fill_super(struct super_block *sb
 
 	CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
 
-	OBD_ALLOC_PTR(cfg);
-	if (cfg = NULL)
+	cfg = kzalloc(sizeof(*cfg), GFP_NOFS);
+	if (!cfg)
 		return -ENOMEM;
 
 	try_module_get(THIS_MODULE);
@@ -1049,14 +1049,14 @@ int ll_fill_super(struct super_block *sb
 	CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
 	       lprof->lp_md, lprof->lp_dt);
 
-	OBD_ALLOC(dt, strlen(lprof->lp_dt) + instlen + 2);
+	dt = kzalloc(strlen(lprof->lp_dt) + instlen + 2, GFP_NOFS);
 	if (!dt) {
 		err = -ENOMEM;
 		goto out_free;
 	}
 	sprintf(dt, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
 
-	OBD_ALLOC(md, strlen(lprof->lp_md) + instlen + 2);
+	md = kzalloc(strlen(lprof->lp_md) + instlen + 2, GFP_NOFS);
 	if (!md) {
 		err = -ENOMEM;
 		goto out_free;
@@ -1437,8 +1437,8 @@ int ll_setattr_raw(struct dentry *dentry
 	/* We always do an MDS RPC, even if we're only changing the size;
 	 * only the MDS knows whether truncate() should fail with -ETXTBUSY */
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data = NULL)
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data)
 		return -ENOMEM;
 
 	if (!S_ISDIR(inode->i_mode)) {
@@ -2029,7 +2029,7 @@ void ll_umount_begin(struct super_block
 	}
 	obd->obd_force = 1;
 
-	OBD_ALLOC_PTR(ioc_data);
+	ioc_data = kzalloc(sizeof(*ioc_data), GFP_NOFS);
 	if (ioc_data) {
 		obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_md_exp,
 			      sizeof(*ioc_data), ioc_data, NULL);
@@ -2251,7 +2251,7 @@ struct md_op_data *ll_prep_md_op_data(st
 		return ERR_PTR(-ENAMETOOLONG);
 
 	if (op_data = NULL)
-		OBD_ALLOC_PTR(op_data);
+		op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
 
 	if (op_data = NULL)
 		return ERR_PTR(-ENOMEM);
diff -u -p a/drivers/staging/lustre/lustre/llite/xattr_cache.c b/drivers/staging/lustre/lustre/llite/xattr_cache.c
--- a/drivers/staging/lustre/lustre/llite/xattr_cache.c
+++ b/drivers/staging/lustre/lustre/llite/xattr_cache.c
@@ -128,13 +128,13 @@ static int ll_xattr_cache_add(struct lis
 
 	xattr->xe_namelen = strlen(xattr_name) + 1;
 
-	OBD_ALLOC(xattr->xe_name, xattr->xe_namelen);
+	xattr->xe_name = kzalloc(xattr->xe_namelen, GFP_NOFS);
 	if (!xattr->xe_name) {
 		CDEBUG(D_CACHE, "failed to alloc xattr name %u\n",
 		       xattr->xe_namelen);
 		goto err_name;
 	}
-	OBD_ALLOC(xattr->xe_value, xattr_val_len);
+	xattr->xe_value = kzalloc(xattr_val_len, GFP_NOFS);
 	if (!xattr->xe_value) {
 		CDEBUG(D_CACHE, "failed to alloc xattr value %d\n",
 		       xattr_val_len);
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_close.c b/drivers/staging/lustre/lustre/llite/llite_close.c
--- a/drivers/staging/lustre/lustre/llite/llite_close.c
+++ b/drivers/staging/lustre/lustre/llite/llite_close.c
@@ -285,8 +285,8 @@ static void ll_done_writing(struct inode
 
 	LASSERT(exp_connect_som(ll_i2mdexp(inode)));
 
-	OBD_ALLOC_PTR(op_data);
-	if (op_data = NULL) {
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
 		CERROR("can't allocate op_data\n");
 		return;
 	}
@@ -367,8 +367,8 @@ int ll_close_thread_start(struct ll_clos
 	if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CLOSE_THREAD))
 		return -EINTR;
 
-	OBD_ALLOC(lcq, sizeof(*lcq));
-	if (lcq = NULL)
+	lcq = kzalloc(sizeof(*lcq), GFP_NOFS);
+	if (!lcq)
 		return -ENOMEM;
 
 	spin_lock_init(&lcq->lcq_lock);
diff -u -p a/drivers/staging/lustre/lustre/llite/symlink.c b/drivers/staging/lustre/lustre/llite/symlink.c
--- a/drivers/staging/lustre/lustre/llite/symlink.c
+++ b/drivers/staging/lustre/lustre/llite/symlink.c
@@ -106,7 +106,7 @@ static int ll_readlink_internal(struct i
 		goto failed;
 	}
 
-	OBD_ALLOC(lli->lli_symlink_name, symlen);
+	lli->lli_symlink_name = kzalloc(symlen, GFP_NOFS);
 	/* do not return an error if we cannot cache the symlink locally */
 	if (lli->lli_symlink_name) {
 		memcpy(lli->lli_symlink_name, *symname, symlen);
diff -u -p a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
--- a/drivers/staging/lustre/lustre/llite/namei.c
+++ b/drivers/staging/lustre/lustre/llite/namei.c
@@ -624,7 +624,7 @@ static int ll_atomic_open(struct inode *
 	       dentry->d_name.len, dentry->d_name.name, dir->i_ino,
 	       dir->i_generation, dir, file, open_flags, mode, *opened);
 
-	OBD_ALLOC(it, sizeof(*it));
+	it = kzalloc(sizeof(*it), GFP_NOFS);
 	if (!it)
 		return -ENOMEM;
 
diff -u -p a/drivers/staging/lustre/lustre/llite/llite_rmtacl.c b/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
--- a/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
+++ b/drivers/staging/lustre/lustre/llite/llite_rmtacl.c
@@ -78,7 +78,7 @@ static struct rmtacl_ctl_entry *rce_allo
 {
 	struct rmtacl_ctl_entry *rce;
 
-	OBD_ALLOC_PTR(rce);
+	rce = kzalloc(sizeof(*rce), GFP_NOFS);
 	if (!rce)
 		return NULL;
 
@@ -184,7 +184,7 @@ static struct eacl_entry *ee_alloc(pid_t
 {
 	struct eacl_entry *ee;
 
-	OBD_ALLOC_PTR(ee);
+	ee = kzalloc(sizeof(*ee), GFP_NOFS);
 	if (!ee)
 		return NULL;
 

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Dan Carpenter]

On Thu, Sep 18, 2014 at 10:24:02PM +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> This patch removes some kzalloc-related macros and rewrites the
> associated null tests to use !x rather than x == NULL.
> 

This is sort of exactly what Oleg asked us not to do in his previous
email.  ;P

I think there might be ways to get good enough tracing using standard
kernel features but it's legitimately tricky to update everything to
using mempools or whatever.  Maybe we should give Oleg some breathing
room to do this.

I hate looking at the OBD_ALLOC* macros, but really it's not as if we
don't have allocation helper functions anywhere in the rest of the
kernel.  It's just that the style of the lustre helpers is so very very
ugly.  It took me a while to spot that OBD_ALLOC() zeroes memory, for
example.

It should be relatively easy to re-write the macros so we can change
formats like this:

old:	OBD_ALLOC(ptr, size);
new:	ptr = obd_zalloc(size, GFP_NOFS);

old:	OBD_ALLOC_WAIT(ptr, size);
new:	ptr = obd_zalloc(size, GFP_KERNEL);

old:	OBD_ALLOC_PTR(ptr);
new:	ptr = obd_zalloc(sizeof(*ptr), GFP_NOFS);

etc...

Writing it this way means that we can't put the name of the pointer
we're allocating in the debug output but we could use the file and line
number instead or something.  Oleg, what do you think?

If we decide to mass convert to standard functions later then it's dead
simple to do that with sed.

The __OBD_MALLOC_VERBOSE() is hard to read.  It has side effect bugs if
you try to call OBD_ALLOC(ptr++, size);  The kernel already has a way to
inject kmalloc() failures for a specific module so that bit can be
removed.  Read Documentation/fault-injection/fault-injection.txt

regards,
dan carpenter

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Dan Carpenter]

On Thu, Sep 18, 2014 at 10:24:02PM +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> This patch removes some kzalloc-related macros and rewrites the
> associated null tests to use !x rather than x = NULL.
> 

This is sort of exactly what Oleg asked us not to do in his previous
email.  ;P

I think there might be ways to get good enough tracing using standard
kernel features but it's legitimately tricky to update everything to
using mempools or whatever.  Maybe we should give Oleg some breathing
room to do this.

I hate looking at the OBD_ALLOC* macros, but really it's not as if we
don't have allocation helper functions anywhere in the rest of the
kernel.  It's just that the style of the lustre helpers is so very very
ugly.  It took me a while to spot that OBD_ALLOC() zeroes memory, for
example.

It should be relatively easy to re-write the macros so we can change
formats like this:

old:	OBD_ALLOC(ptr, size);
new:	ptr = obd_zalloc(size, GFP_NOFS);

old:	OBD_ALLOC_WAIT(ptr, size);
new:	ptr = obd_zalloc(size, GFP_KERNEL);

old:	OBD_ALLOC_PTR(ptr);
new:	ptr = obd_zalloc(sizeof(*ptr), GFP_NOFS);

etc...

Writing it this way means that we can't put the name of the pointer
we're allocating in the debug output but we could use the file and line
number instead or something.  Oleg, what do you think?

If we decide to mass convert to standard functions later then it's dead
simple to do that with sed.

The __OBD_MALLOC_VERBOSE() is hard to read.  It has side effect bugs if
you try to call OBD_ALLOC(ptr++, size);  The kernel already has a way to
inject kmalloc() failures for a specific module so that bit can be
removed.  Read Documentation/fault-injection/fault-injection.txt

regards,
dan carpenter

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

Hello!

On Sep 18, 2014, at 7:43 PM, Dan Carpenter wrote:

> On Thu, Sep 18, 2014 at 10:24:02PM +0200, Julia Lawall wrote:
>> From: Julia Lawall <Julia.Lawall@lip6.fr>
>> 
>> This patch removes some kzalloc-related macros and rewrites the
>> associated null tests to use !x rather than x == NULL.
> This is sort of exactly what Oleg asked us not to do in his previous
> email.  ;P

Hey, Thanks for remembering me ;)

> I think there might be ways to get good enough tracing using standard
> kernel features but it's legitimately tricky to update everything to
> using mempools or whatever.  Maybe we should give Oleg some breathing
> room to do this.

In fact I was mostly mourning ENTRY/EXIT/GOTO stuff back then - I don't know how to
replace anything like that even one bit at the scale we need.
the OBD_ALLOC()/FREE() served multiple purposes most of which could be done with other ways now:
1. general accounting for lustre memory usage (all types directly allocated through the macros), with a message present at the module unload if we freed less than allocated - a warning is printed on unload which would set off a search for the leak (hey, at least we know there is a leak somewhat fast, we also know how much was leaked, and we might probably find out how many allocations were not freed if we wanted to add that stats). - I don't know how to replace that, so perhaps a macro for this still be useful.
2. Hunting memory leaks (this is what the variable allocated, where it was allocated, where it was freed, and the address of the allocation printed) - on non-production systems this could be replaced with kernel memory leak detector now - in fact it's even more convenient since you don't need to match up logs with a script to see what allocated what, and there's even a convenient backtrace printed as a bonus. I used it and really liked the result.
This is not really fitting in production, as kmemleak tends to eat memory like there's no tomorrow (at least in my config) and also might need a kernel rebuild. But it's not like getting people
to gather proper debug logs was easy too. So we can probably do away with that.
3. Fault injections - there's now a way to do this in the kernel, so we probably can do away with this too.
4. Sometimes we need large allocations. general kmalloc is less reliable as system lives on and memory fragmentation worsens. So we have this "allocations over 2-4 pages get switched to vmalloc" logic,
if there's a way to do that automatically - that would be great.

> I hate looking at the OBD_ALLOC* macros, but really it's not as if we
> don't have allocation helper functions anywhere in the rest of the
> kernel.  It's just that the style of the lustre helpers is so very very
> ugly.  It took me a while to spot that OBD_ALLOC() zeroes memory, for
> example.
> 
> It should be relatively easy to re-write the macros so we can change
> formats like this:
> 
> old:	OBD_ALLOC(ptr, size);
> new:	ptr = obd_zalloc(size, GFP_NOFS);
> 
> old:	OBD_ALLOC_WAIT(ptr, size);
> new:	ptr = obd_zalloc(size, GFP_KERNEL);
> 
> old:	OBD_ALLOC_PTR(ptr);
> new:	ptr = obd_zalloc(sizeof(*ptr), GFP_NOFS);
> 
> etc...
> 
> Writing it this way means that we can't put the name of the pointer
> we're allocating in the debug output but we could use the file and line
> number instead or something.  Oleg, what do you think?

I think we don't really need the allocated pointer and the name all that much now with kmemleak.
But we still need to remember the allocation amount like we do now (and when freeing them later).
This is where OBD_ALLOC_PTR/OBD_FREE_PTR come handy - the size is derived from structure size
automatically - less space for error or unintentional mismatch (since kfree does not really care
about number of bytes freed).
so if you prefer to just have everything lowercased, we probably can do obd_zalloc and obd_zallc_ptr still?
(of course in some other world, there might have been a "context-aware" general alloc/free functions
that would have known if an allocation came from a module context and did the tallying internally,
and then warned on module unload if something did not match. But I imagine such module context determination
would not be easy to do. Perhaps registered callbacks for pools that could be called on alloc and on free - though such pools would also need to allow to allocate different sized chunks too).

> If we decide to mass convert to standard functions later then it's dead
> simple to do that with sed.

It's more ugly with OBD_FREE*, though, where the size is needed, while kfree/vfee does not take size.
Also if you convert allocs while not converting frees, that makes code even more ugly (see the current patch at hand even for the example of that).

> The __OBD_MALLOC_VERBOSE() is hard to read.  It has side effect bugs if
> you try to call OBD_ALLOC(ptr++, size);  The kernel already has a way to
> inject kmalloc() failures for a specific module so that bit can be
> removed.  Read Documentation/fault-injection/fault-injection.txt

Yes, I think I agree here.

Bye,
    Oleg

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

Hello!

On Sep 18, 2014, at 7:43 PM, Dan Carpenter wrote:

> On Thu, Sep 18, 2014 at 10:24:02PM +0200, Julia Lawall wrote:
>> From: Julia Lawall <Julia.Lawall@lip6.fr>
>> 
>> This patch removes some kzalloc-related macros and rewrites the
>> associated null tests to use !x rather than x = NULL.
> This is sort of exactly what Oleg asked us not to do in his previous
> email.  ;P

Hey, Thanks for remembering me ;)

> I think there might be ways to get good enough tracing using standard
> kernel features but it's legitimately tricky to update everything to
> using mempools or whatever.  Maybe we should give Oleg some breathing
> room to do this.

In fact I was mostly mourning ENTRY/EXIT/GOTO stuff back then - I don't know how to
replace anything like that even one bit at the scale we need.
the OBD_ALLOC()/FREE() served multiple purposes most of which could be done with other ways now:
1. general accounting for lustre memory usage (all types directly allocated through the macros), with a message present at the module unload if we freed less than allocated - a warning is printed on unload which would set off a search for the leak (hey, at least we know there is a leak somewhat fast, we also know how much was leaked, and we might probably find out how many allocations were not freed if we wanted to add that stats). - I don't know how to replace that, so perhaps a macro for this still be useful.
2. Hunting memory leaks (this is what the variable allocated, where it was allocated, where it was freed, and the address of the allocation printed) - on non-production systems this could be replaced with kernel memory leak detector now - in fact it's even more convenient since you don't need to match up logs with a script to see what allocated what, and there's even a convenient backtrace printed as a bonus. I used it and really liked the result.
This is not really fitting in production, as kmemleak tends to eat memory like there's no tomorrow (at least in my config) and also might need a kernel rebuild. But it's not like getting people
to gather proper debug logs was easy too. So we can probably do away with that.
3. Fault injections - there's now a way to do this in the kernel, so we probably can do away with this too.
4. Sometimes we need large allocations. general kmalloc is less reliable as system lives on and memory fragmentation worsens. So we have this "allocations over 2-4 pages get switched to vmalloc" logic,
if there's a way to do that automatically - that would be great.

> I hate looking at the OBD_ALLOC* macros, but really it's not as if we
> don't have allocation helper functions anywhere in the rest of the
> kernel.  It's just that the style of the lustre helpers is so very very
> ugly.  It took me a while to spot that OBD_ALLOC() zeroes memory, for
> example.
> 
> It should be relatively easy to re-write the macros so we can change
> formats like this:
> 
> old:	OBD_ALLOC(ptr, size);
> new:	ptr = obd_zalloc(size, GFP_NOFS);
> 
> old:	OBD_ALLOC_WAIT(ptr, size);
> new:	ptr = obd_zalloc(size, GFP_KERNEL);
> 
> old:	OBD_ALLOC_PTR(ptr);
> new:	ptr = obd_zalloc(sizeof(*ptr), GFP_NOFS);
> 
> etc...
> 
> Writing it this way means that we can't put the name of the pointer
> we're allocating in the debug output but we could use the file and line
> number instead or something.  Oleg, what do you think?

I think we don't really need the allocated pointer and the name all that much now with kmemleak.
But we still need to remember the allocation amount like we do now (and when freeing them later).
This is where OBD_ALLOC_PTR/OBD_FREE_PTR come handy - the size is derived from structure size
automatically - less space for error or unintentional mismatch (since kfree does not really care
about number of bytes freed).
so if you prefer to just have everything lowercased, we probably can do obd_zalloc and obd_zallc_ptr still?
(of course in some other world, there might have been a "context-aware" general alloc/free functions
that would have known if an allocation came from a module context and did the tallying internally,
and then warned on module unload if something did not match. But I imagine such module context determination
would not be easy to do. Perhaps registered callbacks for pools that could be called on alloc and on free - though such pools would also need to allow to allocate different sized chunks too).

> If we decide to mass convert to standard functions later then it's dead
> simple to do that with sed.

It's more ugly with OBD_FREE*, though, where the size is needed, while kfree/vfee does not take size.
Also if you convert allocs while not converting frees, that makes code even more ugly (see the current patch at hand even for the example of that).

> The __OBD_MALLOC_VERBOSE() is hard to read.  It has side effect bugs if
> you try to call OBD_ALLOC(ptr++, size);  The kernel already has a way to
> inject kmalloc() failures for a specific module so that bit can be
> removed.  Read Documentation/fault-injection/fault-injection.txt

Yes, I think I agree here.

Bye,
    Oleg

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

On Sep 18, 2014, at 10:57 PM, Drokin, Oleg wrote:

> would not be easy to do. Perhaps registered callbacks for pools that could be called on alloc and on free - though such pools would also need to allow to allocate different sized chunks too).

Come think of it - we don't even need callbacks here. If a pool would allow to allocate different sized chunks of memory. Then on module unmount there's already a warning for freeing
not yet empty pool, and we can even see all the leaked bits if we really want to (in like a crash dump).
So a module would just need to register such a general pool and use it for all allocations.

Bye,
    Oleg

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

With respect to the upper case lower case issue, does the thing need to be
a macro?  I think that the lowercase is more or less fine, but only if
what is behind it is a function.

I say more or less fine, because normally in the kernel the special
allocators have special purposes, eg allocating and initializing the xyz
structure.  Here what is wanted is a general purpose allocator with lots
of special tracing features, so it is not quite the same thing.  And one
can wonder why all of these special tracing features are not relevant to
the kernel as a whole?

In reading through the description of the needed features, it seems like
only the _ptr extension requires being a macro.  Do we need that?  The
rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
unpleasant to have an assignment hidden in this way.  And currently it is
not used consistently.  There are some OBD_ALLOCs that have the same form.

Sorry for overlooking the frees.  I was focusing on trying one thing at a
time...

julia

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

With respect to the upper case lower case issue, does the thing need to be
a macro?  I think that the lowercase is more or less fine, but only if
what is behind it is a function.

I say more or less fine, because normally in the kernel the special
allocators have special purposes, eg allocating and initializing the xyz
structure.  Here what is wanted is a general purpose allocator with lots
of special tracing features, so it is not quite the same thing.  And one
can wonder why all of these special tracing features are not relevant to
the kernel as a whole?

In reading through the description of the needed features, it seems like
only the _ptr extension requires being a macro.  Do we need that?  The
rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
unpleasant to have an assignment hidden in this way.  And currently it is
not used consistently.  There are some OBD_ALLOCs that have the same form.

Sorry for overlooking the frees.  I was focusing on trying one thing at a
time...

julia

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

Hello!

   First, thanks for your patches and efforts spent on these cleanups.

On Sep 19, 2014, at 12:45 AM, Julia Lawall wrote:

> With respect to the upper case lower case issue, does the thing need to be
> a macro?  I think that the lowercase is more or less fine, but only if
> what is behind it is a function.

I don't have a strong opinion either way as long as we have all the functionality
we need.

> I say more or less fine, because normally in the kernel the special
> allocators have special purposes, eg allocating and initializing the xyz
> structure.  Here what is wanted is a general purpose allocator with lots
> of special tracing features, so it is not quite the same thing.  And one
> can wonder why all of these special tracing features are not relevant to
> the kernel as a whole?

Like I explained in my previous email, many of the tracing features are already
possible to replace with other existing in-kernel mechanisms like kmemleak.

Except the total tally of allocations/frees so that a memleak could be visibly
easily seen on module unload time. I think this would be useful for other
kinds of modules too, not just lustre, so having that as a generic allocator
feature would be cool too.

> In reading through the description of the needed features, it seems like
> only the _ptr extension requires being a macro.  Do we need that?  The

We only need that as a less error-prone way of having
x = obd_kzalloc(sizeof(*x), ….)
…
obd_free(…, sizeof(*x))

Real free function does not take size argument, but we need that for
total allocated/freed accounting. Easy to have disconnect with
the size argument of obd_free to be wrong.

> rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
> unpleasant to have an assignment hidden in this way.  And currently it is
> not used consistently.  There are some OBD_ALLOCs that have the same form.

Yes, those are converted as thy are noticed.

> Sorry for overlooking the frees.  I was focusing on trying one thing at a
> time...

I kind of think it's a related issue.
Touching ones needs to touch the other if not in the same patch then in
a next patch. And that's why I think consideations for what FREEs would need
is needed from the start, so the FREEs removal patch does not goes and patches a bunch of just patched allocs.

Thanks.

Bye,
    Oleg

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

Hello!

   First, thanks for your patches and efforts spent on these cleanups.

On Sep 19, 2014, at 12:45 AM, Julia Lawall wrote:

> With respect to the upper case lower case issue, does the thing need to be
> a macro?  I think that the lowercase is more or less fine, but only if
> what is behind it is a function.

I don't have a strong opinion either way as long as we have all the functionality
we need.

> I say more or less fine, because normally in the kernel the special
> allocators have special purposes, eg allocating and initializing the xyz
> structure.  Here what is wanted is a general purpose allocator with lots
> of special tracing features, so it is not quite the same thing.  And one
> can wonder why all of these special tracing features are not relevant to
> the kernel as a whole?

Like I explained in my previous email, many of the tracing features are already
possible to replace with other existing in-kernel mechanisms like kmemleak.

Except the total tally of allocations/frees so that a memleak could be visibly
easily seen on module unload time. I think this would be useful for other
kinds of modules too, not just lustre, so having that as a generic allocator
feature would be cool too.

> In reading through the description of the needed features, it seems like
> only the _ptr extension requires being a macro.  Do we need that?  The

We only need that as a less error-prone way of having
x = obd_kzalloc(sizeof(*x), ….)
…
obd_free(…, sizeof(*x))

Real free function does not take size argument, but we need that for
total allocated/freed accounting. Easy to have disconnect with
the size argument of obd_free to be wrong.

> rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
> unpleasant to have an assignment hidden in this way.  And currently it is
> not used consistently.  There are some OBD_ALLOCs that have the same form.

Yes, those are converted as thy are noticed.

> Sorry for overlooking the frees.  I was focusing on trying one thing at a
> time...

I kind of think it's a related issue.
Touching ones needs to touch the other if not in the same patch then in
a next patch. And that's why I think consideations for what FREEs would need
is needed from the start, so the FREEs removal patch does not goes and patches a bunch of just patched allocs.

Thanks.

Bye,
    Oleg--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 2642 bytes --]



On Fri, 19 Sep 2014, Drokin, Oleg wrote:

> Hello!
>
>    First, thanks for your patches and efforts spent on these cleanups.
>
> On Sep 19, 2014, at 12:45 AM, Julia Lawall wrote:
>
> > With respect to the upper case lower case issue, does the thing need to be
> > a macro?  I think that the lowercase is more or less fine, but only if
> > what is behind it is a function.
>
> I don't have a strong opinion either way as long as we have all the functionality
> we need.
>
> > I say more or less fine, because normally in the kernel the special
> > allocators have special purposes, eg allocating and initializing the xyz
> > structure.  Here what is wanted is a general purpose allocator with lots
> > of special tracing features, so it is not quite the same thing.  And one
> > can wonder why all of these special tracing features are not relevant to
> > the kernel as a whole?
>
> Like I explained in my previous email, many of the tracing features are already
> possible to replace with other existing in-kernel mechanisms like kmemleak.
>
> Except the total tally of allocations/frees so that a memleak could be visibly
> easily seen on module unload time. I think this would be useful for other
> kinds of modules too, not just lustre, so having that as a generic allocator
> feature would be cool too.
>
> > In reading through the description of the needed features, it seems like
> > only the _ptr extension requires being a macro.  Do we need that?  The
>
> We only need that as a less error-prone way of having
> x = obd_kzalloc(sizeof(*x), ….)
> …
> obd_free(…, sizeof(*x))
>
> Real free function does not take size argument, but we need that for
> total allocated/freed accounting. Easy to have disconnect with
> the size argument of obd_free to be wrong.
>
> > rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
> > unpleasant to have an assignment hidden in this way.  And currently it is
> > not used consistently.  There are some OBD_ALLOCs that have the same form.
>
> Yes, those are converted as thy are noticed.
>
> > Sorry for overlooking the frees.  I was focusing on trying one thing at a
> > time...
>
> I kind of think it's a related issue.
> Touching ones needs to touch the other if not in the same patch then in
> a next patch. And that's why I think consideations for what FREEs would need
> is needed from the start, so the FREEs removal patch does not goes and patches a bunch of just patched allocs.

Sure, it's fine.

Where do you want to go from here?  Should I propose function definitions
for obd_alloc and obd_free?  Could we leave the vmalloc issue for a future
set of changes?

julia

Re: [HPDD-discuss] [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Julia Lawall]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 2706 bytes --]



On Fri, 19 Sep 2014, Drokin, Oleg wrote:

> Hello!
>
>    First, thanks for your patches and efforts spent on these cleanups.
>
> On Sep 19, 2014, at 12:45 AM, Julia Lawall wrote:
>
> > With respect to the upper case lower case issue, does the thing need to be
> > a macro?  I think that the lowercase is more or less fine, but only if
> > what is behind it is a function.
>
> I don't have a strong opinion either way as long as we have all the functionality
> we need.
>
> > I say more or less fine, because normally in the kernel the special
> > allocators have special purposes, eg allocating and initializing the xyz
> > structure.  Here what is wanted is a general purpose allocator with lots
> > of special tracing features, so it is not quite the same thing.  And one
> > can wonder why all of these special tracing features are not relevant to
> > the kernel as a whole?
>
> Like I explained in my previous email, many of the tracing features are already
> possible to replace with other existing in-kernel mechanisms like kmemleak.
>
> Except the total tally of allocations/frees so that a memleak could be visibly
> easily seen on module unload time. I think this would be useful for other
> kinds of modules too, not just lustre, so having that as a generic allocator
> feature would be cool too.
>
> > In reading through the description of the needed features, it seems like
> > only the _ptr extension requires being a macro.  Do we need that?  The
>
> We only need that as a less error-prone way of having
> x = obd_kzalloc(sizeof(*x), ….)
> …
> obd_free(…, sizeof(*x))
>
> Real free function does not take size argument, but we need that for
> total allocated/freed accounting. Easy to have disconnect with
> the size argument of obd_free to be wrong.
>
> > rest of the kernel manages to do x = kzalloc(sizeof(*x),...) ok.  It's
> > unpleasant to have an assignment hidden in this way.  And currently it is
> > not used consistently.  There are some OBD_ALLOCs that have the same form.
>
> Yes, those are converted as thy are noticed.
>
> > Sorry for overlooking the frees.  I was focusing on trying one thing at a
> > time...
>
> I kind of think it's a related issue.
> Touching ones needs to touch the other if not in the same patch then in
> a next patch. And that's why I think consideations for what FREEs would need
> is needed from the start, so the FREEs removal patch does not goes and patches a bunch of just patched allocs.

Sure, it's fine.

Where do you want to go from here?  Should I propose function definitions
for obd_alloc and obd_free?  Could we leave the vmalloc issue for a future
set of changes?

julia

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Dan Carpenter]

On Fri, Sep 19, 2014 at 02:57:03AM +0000, Drokin, Oleg wrote:
> 4. Sometimes we need large allocations. general kmalloc is less
> reliable as system lives on and memory fragmentation worsens. So we
> have this "allocations over 2-4 pages get switched to vmalloc" logic,
> if there's a way to do that automatically - that would be great.

Julia's patch only changes OBD_ALLOC() functions and those are always
kmalloc so that's not an issue here.

The OBD_ALLOC_LARGE() macro is vmalloc() or kmalloc() if the size is
small enough.  We don't really want to choose between kmalloc and
vmalloc automatically.  My instinct is that we should change all the
OBD_ALLOC_LARGE() to vmalloc() and trust it to allocate them in the most
sane way possible.  But I haven't really looked very closely.

regards,
dan carpenter

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Dan Carpenter]

On Fri, Sep 19, 2014 at 02:57:03AM +0000, Drokin, Oleg wrote:
> 4. Sometimes we need large allocations. general kmalloc is less
> reliable as system lives on and memory fragmentation worsens. So we
> have this "allocations over 2-4 pages get switched to vmalloc" logic,
> if there's a way to do that automatically - that would be great.

Julia's patch only changes OBD_ALLOC() functions and those are always
kmalloc so that's not an issue here.

The OBD_ALLOC_LARGE() macro is vmalloc() or kmalloc() if the size is
small enough.  We don't really want to choose between kmalloc and
vmalloc automatically.  My instinct is that we should change all the
OBD_ALLOC_LARGE() to vmalloc() and trust it to allocate them in the most
sane way possible.  But I haven't really looked very closely.

regards,
dan carpenter

Re: [PATCH] staging: lustre: llite: Use kzalloc and rewrite null tests

[Drokin, Oleg]

On Sep 19, 2014, at 5:11 AM, Dan Carpenter wrote:

> On Fri, Sep 19, 2014 at 02:57:03AM +0000, Drokin, Oleg wrote:
>> 4. Sometimes we need large allocations. general kmalloc is less
>> reliable as system lives on and memory fragmentation worsens. So we
>> have this "allocations over 2-4 pages get switched to vmalloc" logic,
>> if there's a way to do that automatically - that would be great.
> 
> Julia's patch only changes OBD_ALLOC() functions and those are always
> kmalloc so that's not an issue here.

That's true. Though it would be strange to convert just a subset of those
allocating macros, and the solution for the OBD_ALLOC_LARGE would
also be needed.
> 
> The OBD_ALLOC_LARGE() macro is vmalloc() or kmalloc() if the size is
> small enough.  We don't really want to choose between kmalloc and
> vmalloc automatically.  My instinct is that we should change all the
> OBD_ALLOC_LARGE() to vmalloc() and trust it to allocate them in the most
> sane way possible.  But I haven't really looked very closely.

We found that vmalloc (at least with larger allocs, I did not look into details)
has quite a big penalty with some internal lock that creates big contention at
production loads.
So of course the desire is there to reduce our allocations when we can.
(additionally on 32 bit arches there's always this issue of vmalloc region
possibly not being large enough to allocate everything we might want whenever
we see a way for that).

Thanks.

Bye,
    Oleg