Re: linux-next: build failure after merge of the staging tree

[Peng Tao <bergwolf@gmail.com>]

On Tue, Jun 4, 2013 at 1:42 PM, Greg KH <greg@kroah.com> wrote:
> On Tue, Jun 04, 2013 at 02:57:00PM +1000, Stephen Rothwell wrote:
>> Hi Greg,
>>
>> After merging the staging tree, today's linux-next build (x86_64
>> allmodconfig) failed like this:
>>
>> In file included from drivers/staging/lustre/lustre/fid/../include/linux/lustre_compat25.h:44:0,
>>                  from drivers/staging/lustre/lustre/fid/../include/linux/lvfs.h:48,
>>                  from drivers/staging/lustre/lustre/fid/../include/lvfs.h:45,
>>                  from drivers/staging/lustre/lustre/fid/../include/obd_support.h:41,
>>                  from drivers/staging/lustre/lustre/fid/../include/linux/obd.h:44,
>>                  from drivers/staging/lustre/lustre/fid/../include/obd.h:40,
>>                  from drivers/staging/lustre/lustre/fid/fid_store.c:48:
>> drivers/staging/lustre/lustre/fid/../include/linux/lustre_patchless_compat.h: In function 'truncate_complete_page':
>> drivers/staging/lustre/lustre/fid/../include/linux/lustre_patchless_compat.h:56:3: error: too few arguments to function 'page->mapping->a_ops->invalidatepage'
>>    page->mapping->a_ops->invalidatepage(page, 0);
>>    ^
>>
>> Lots of times.
>>
>> Caused by the Lustre client patches interacting with commit d47992f86b30
>> ("mm: change invalidatepage prototype to accept length") from the ext4
>> tree.
>>
>> I added this merge fix patch:
>>
>> From 3873636f50eb89ba5e4f8e4e0523fd62f681edc8 Mon Sep 17 00:00:00 2001
>> From: Stephen Rothwell <sfr@canb.auug.org.au>
>> Date: Tue, 4 Jun 2013 14:41:00 +1000
>> Subject: [PATCH] staging/lustre: fix for invalidatepage() API change
>>
>> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
>> ---
>>  drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h b/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h
>> index f050808..67c4644 100644
>> --- a/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h
>> +++ b/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h
>> @@ -53,7 +53,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
>>               return;
>>
>>       if (PagePrivate(page))
>> -             page->mapping->a_ops->invalidatepage(page, 0);
>> +             page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
>>
>>       cancel_dirty_page(page, PAGE_SIZE);
>>       ClearPageMappedToDisk(page);
>> --
>> 1.8.1
>>
>> diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
>> index 27e4e64..f1a1c5f 100644
>> --- a/drivers/staging/lustre/lustre/llite/rw26.c
>> +++ b/drivers/staging/lustre/lustre/llite/rw26.c
>> @@ -72,7 +72,8 @@
>>   * aligned truncate). Lustre leaves partially truncated page in the cache,
>>   * relying on struct inode::i_size to limit further accesses.
>>   */
>> -static void ll_invalidatepage(struct page *vmpage, unsigned long offset)
>> +static void ll_invalidatepage(struct page *vmpage, unsigned int offset,
>> +                           unsigned int length)
>>  {
>>       struct inode     *inode;
>>       struct lu_env    *env;
>> @@ -89,7 +90,7 @@ static void ll_invalidatepage(struct page *vmpage, unsigned long offset)
>>        * below because they are run with page locked and all our io is
>>        * happening with locked page too
>>        */
>> -     if (offset == 0) {
>> +     if (offset == 0 && length == PAGE_CACHE_SIZE) {
>>               env = cl_env_get(&refcheck);
>>               if (!IS_ERR(env)) {
>>                       inode = vmpage->mapping->host;
>
> That patch makes sense.
>
> But then:
>
>> But then got these errors:
>>
>> drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c: In function 'cfs_cpt_bind':
>> drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c:630:3: error: implicit declaration of function 'set_cpus_allowed' [-Werror=implicit-function-declaration]
>>    rc = set_cpus_allowed(current, *cpumask);
>>    ^
>> cc1: some warnings being treated as errors
>> drivers/staging/lustre/lustre/obdclass/lu_object.c: In function 'key_fini':
>> drivers/staging/lustre/lustre/obdclass/lu_object.c:1354:4: error: implicit declaration of function 'module_refcount' [-Werror=implicit-function-declaration]
>>     LINVRNT(module_refcount(key->lct_owner) > 0);
>>     ^
>> In file included from drivers/staging/lustre/include/linux/libcfs/libcfs.h:203:0,
>>                  from drivers/staging/lustre/lustre/obdclass/lu_object.c:47:
>> drivers/staging/lustre/lustre/obdclass/lu_object.c: In function 'lu_context_keys_dump':
>> drivers/staging/lustre/lustre/obdclass/lu_object.c:1936:42: error: dereferencing pointer to incomplete type
>>            key->lct_owner ? key->lct_owner->name : "",
>>                                           ^
>> drivers/staging/lustre/include/linux/libcfs/libcfs_debug.h:221:41: note: in definition of macro '__CDEBUG'
>>    libcfs_debug_msg(&msgdata, format, ## __VA_ARGS__);     \
>>                                          ^
>> drivers/staging/lustre/include/linux/libcfs/libcfs_debug.h:238:30: note: in expansion of macro 'CDEBUG_LIMIT'
>>  #define CERROR(format, ...)  CDEBUG_LIMIT(D_ERROR, format, ## __VA_ARGS__)
>>                               ^
>> drivers/staging/lustre/lustre/obdclass/lu_object.c:1932:4: note: in expansion of macro 'CERROR'
>>     CERROR("[%d]: %p %x (%p,%p,%p) %d %d \"%s\"@%p\n",
>>     ^
>> cc1: some warnings being treated as errors
>> drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c: In function 'ptlrpcd':
>> drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c:398:4: error: implicit declaration of function 'set_cpus_allowed' [-Werror=implicit-function-declaration]
>>     cfs_set_cpus_allowed(current,
>>     ^
>> cc1: some warnings being treated as errors
>
> That must be some #include files needed for ppc.
>
>> So I gave up and just reverted commit 52f6317528c6 ("staging/lustre: drop
>> CONFIG_BROKEN dependency") (thus disabling the code again) for now.
>
> That makes sense.
>
> Any of the lustre developers want to send me patches to fix the build
> issues up please?
Hi Greg,

I have just sent you a patch fixing the build failure. It was because
of some CONFIG_ options that Lustre was not well tested against.

1. set_cpus_allowed() is not available with CONFIG_CPUMASK_OFFSTACK on
2. CONFIG_MODULES may not be defined and it causes accessing
module->name field to fail.
3. CONFIG_MODULE_UNLOAD may not be defined, and it causes missing
module_refcount()

--
Thanks,
Tao