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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, "Dan Williams" <dan.j.williams@intel.com>,
	"Christoph Hellwig" <hch@lst.de>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Logan Gunthorpe" <logang@deltatee.com>,
	"Balbir Singh" <bsingharora@gmail.com>,
	"Michal Hocko" <mhocko@suse.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Linus Torvalds" <torvalds@linux-foundation.org>
Subject: [PATCH 4.20 13/65] mm, hmm: use devm semantics for hmm_devmem_{add, remove}
Date: Fri, 11 Jan 2019 15:14:59 +0100
Message-ID: <20190111131058.239240598@linuxfoundation.org> (raw)
In-Reply-To: <20190111131055.331350141@linuxfoundation.org>

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Williams <dan.j.williams@intel.com>

commit 58ef15b765af0d2cbe6799ec564f1dc485010ab8 upstream.

devm semantics arrange for resources to be torn down when
device-driver-probe fails or when device-driver-release completes.
Similar to devm_memremap_pages() there is no need to support an explicit
remove operation when the users properly adhere to devm semantics.

Note that devm_kzalloc() automatically handles allocating node-local
memory.

Link: http://lkml.kernel.org/r/154275559545.76910.9186690723515469051.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/hmm.h |    4 -
 mm/hmm.c            |  127 +++++++++-------------------------------------------
 2 files changed, 25 insertions(+), 106 deletions(-)

--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -512,8 +512,7 @@ struct hmm_devmem {
  * enough and allocate struct page for it.
  *
  * The device driver can wrap the hmm_devmem struct inside a private device
- * driver struct. The device driver must call hmm_devmem_remove() before the
- * device goes away and before freeing the hmm_devmem struct memory.
+ * driver struct.
  */
 struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
 				  struct device *device,
@@ -521,7 +520,6 @@ struct hmm_devmem *hmm_devmem_add(const
 struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
 					   struct device *device,
 					   struct resource *res);
-void hmm_devmem_remove(struct hmm_devmem *devmem);
 
 /*
  * hmm_devmem_page_set_drvdata - set per-page driver data field
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -987,7 +987,6 @@ static void hmm_devmem_ref_exit(void *da
 
 	devmem = container_of(ref, struct hmm_devmem, ref);
 	percpu_ref_exit(ref);
-	devm_remove_action(devmem->device, &hmm_devmem_ref_exit, data);
 }
 
 static void hmm_devmem_ref_kill(void *data)
@@ -998,7 +997,6 @@ static void hmm_devmem_ref_kill(void *da
 	devmem = container_of(ref, struct hmm_devmem, ref);
 	percpu_ref_kill(ref);
 	wait_for_completion(&devmem->completion);
-	devm_remove_action(devmem->device, &hmm_devmem_ref_kill, data);
 }
 
 static int hmm_devmem_fault(struct vm_area_struct *vma,
@@ -1036,7 +1034,7 @@ static void hmm_devmem_radix_release(str
 	mutex_unlock(&hmm_devmem_lock);
 }
 
-static void hmm_devmem_release(struct device *dev, void *data)
+static void hmm_devmem_release(void *data)
 {
 	struct hmm_devmem *devmem = data;
 	struct resource *resource = devmem->resource;
@@ -1044,11 +1042,6 @@ static void hmm_devmem_release(struct de
 	struct zone *zone;
 	struct page *page;
 
-	if (percpu_ref_tryget_live(&devmem->ref)) {
-		dev_WARN(dev, "%s: page mapping is still live!\n", __func__);
-		percpu_ref_put(&devmem->ref);
-	}
-
 	/* pages are dead and unused, undo the arch mapping */
 	start_pfn = (resource->start & ~(PA_SECTION_SIZE - 1)) >> PAGE_SHIFT;
 	npages = ALIGN(resource_size(resource), PA_SECTION_SIZE) >> PAGE_SHIFT;
@@ -1174,19 +1167,6 @@ error:
 	return ret;
 }
 
-static int hmm_devmem_match(struct device *dev, void *data, void *match_data)
-{
-	struct hmm_devmem *devmem = data;
-
-	return devmem->resource == match_data;
-}
-
-static void hmm_devmem_pages_remove(struct hmm_devmem *devmem)
-{
-	devres_release(devmem->device, &hmm_devmem_release,
-		       &hmm_devmem_match, devmem->resource);
-}
-
 /*
  * hmm_devmem_add() - hotplug ZONE_DEVICE memory for device memory
  *
@@ -1214,8 +1194,7 @@ struct hmm_devmem *hmm_devmem_add(const
 
 	dev_pagemap_get_ops();
 
-	devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem),
-				   GFP_KERNEL, dev_to_node(device));
+	devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
 	if (!devmem)
 		return ERR_PTR(-ENOMEM);
 
@@ -1229,11 +1208,11 @@ struct hmm_devmem *hmm_devmem_add(const
 	ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
 			      0, GFP_KERNEL);
 	if (ret)
-		goto error_percpu_ref;
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit, &devmem->ref);
 	if (ret)
-		goto error_devm_add_action;
+		return ERR_PTR(ret);
 
 	size = ALIGN(size, PA_SECTION_SIZE);
 	addr = min((unsigned long)iomem_resource.end,
@@ -1253,16 +1232,12 @@ struct hmm_devmem *hmm_devmem_add(const
 
 		devmem->resource = devm_request_mem_region(device, addr, size,
 							   dev_name(device));
-		if (!devmem->resource) {
-			ret = -ENOMEM;
-			goto error_no_resource;
-		}
+		if (!devmem->resource)
+			return ERR_PTR(-ENOMEM);
 		break;
 	}
-	if (!devmem->resource) {
-		ret = -ERANGE;
-		goto error_no_resource;
-	}
+	if (!devmem->resource)
+		return ERR_PTR(-ERANGE);
 
 	devmem->resource->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
 	devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
@@ -1271,28 +1246,13 @@ struct hmm_devmem *hmm_devmem_add(const
 
 	ret = hmm_devmem_pages_create(devmem);
 	if (ret)
-		goto error_pages;
-
-	devres_add(device, devmem);
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref);
-	if (ret) {
-		hmm_devmem_remove(devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem);
+	if (ret)
 		return ERR_PTR(ret);
-	}
 
 	return devmem;
-
-error_pages:
-	devm_release_mem_region(device, devmem->resource->start,
-				resource_size(devmem->resource));
-error_no_resource:
-error_devm_add_action:
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-error_percpu_ref:
-	devres_free(devmem);
-	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(hmm_devmem_add);
 
@@ -1308,8 +1268,7 @@ struct hmm_devmem *hmm_devmem_add_resour
 
 	dev_pagemap_get_ops();
 
-	devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem),
-				   GFP_KERNEL, dev_to_node(device));
+	devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
 	if (!devmem)
 		return ERR_PTR(-ENOMEM);
 
@@ -1323,12 +1282,12 @@ struct hmm_devmem *hmm_devmem_add_resour
 	ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
 			      0, GFP_KERNEL);
 	if (ret)
-		goto error_percpu_ref;
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit,
+			&devmem->ref);
 	if (ret)
-		goto error_devm_add_action;
-
+		return ERR_PTR(ret);
 
 	devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
 	devmem->pfn_last = devmem->pfn_first +
@@ -1336,60 +1295,22 @@ struct hmm_devmem *hmm_devmem_add_resour
 
 	ret = hmm_devmem_pages_create(devmem);
 	if (ret)
-		goto error_devm_add_action;
+		return ERR_PTR(ret);
 
-	devres_add(device, devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem);
+	if (ret)
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref);
-	if (ret) {
-		hmm_devmem_remove(devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_kill,
+			&devmem->ref);
+	if (ret)
 		return ERR_PTR(ret);
-	}
 
 	return devmem;
-
-error_devm_add_action:
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-error_percpu_ref:
-	devres_free(devmem);
-	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(hmm_devmem_add_resource);
 
 /*
- * hmm_devmem_remove() - remove device memory (kill and free ZONE_DEVICE)
- *
- * @devmem: hmm_devmem struct use to track and manage the ZONE_DEVICE memory
- *
- * This will hot-unplug memory that was hotplugged by hmm_devmem_add on behalf
- * of the device driver. It will free struct page and remove the resource that
- * reserved the physical address range for this device memory.
- */
-void hmm_devmem_remove(struct hmm_devmem *devmem)
-{
-	resource_size_t start, size;
-	struct device *device;
-	bool cdm = false;
-
-	if (!devmem)
-		return;
-
-	device = devmem->device;
-	start = devmem->resource->start;
-	size = resource_size(devmem->resource);
-
-	cdm = devmem->resource->desc == IORES_DESC_DEVICE_PUBLIC_MEMORY;
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-	hmm_devmem_pages_remove(devmem);
-
-	if (!cdm)
-		devm_release_mem_region(device, start, size);
-}
-EXPORT_SYMBOL(hmm_devmem_remove);
-
-/*
  * A device driver that wants to handle multiple devices memory through a
  * single fake device can use hmm_device to do so. This is purely a helper
  * and it is not needed to make use of any HMM functionality.



  parent reply index

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-11 14:14 [PATCH 4.20 00/65] 4.20.2-stable review Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 01/65] scsi: zfcp: fix posting too many status read buffers leading to adapter shutdown Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 02/65] scsi: lpfc: do not set queue->page_count to 0 if pc_sli4_params.wqpcnt is invalid Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 03/65] fork: record start_time late Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 04/65] zram: fix double free backing device Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 05/65] hwpoison, memory_hotplug: allow hwpoisoned pages to be offlined Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 06/65] mm, devm_memremap_pages: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 07/65] mm, devm_memremap_pages: kill mapping "System RAM" support Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 08/65] mm, devm_memremap_pages: fix shutdown handling Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 09/65] memcg, oom: notify on oom killer invocation from the charge path Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 10/65] sunrpc: fix cache_head leak due to queued request Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 11/65] sunrpc: use SVC_NET() in svcauth_gss_* functions Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 12/65] mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support Greg Kroah-Hartman
2019-01-11 14:14 ` Greg Kroah-Hartman [this message]
2019-01-11 14:15 ` [PATCH 4.20 14/65] mm, hmm: replace hmm_devmem_pages_create() with devm_memremap_pages() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 15/65] mm, hmm: mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL_GPL Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 16/65] mm, swap: fix swapoff with KSM pages Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 17/65] media: cx23885: only reset DMA on problematic CPUs Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 18/65] ALSA: cs46xx: Potential NULL dereference in probe Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 19/65] ALSA: usb-audio: Avoid access before bLength check in build_audio_procunit() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 20/65] ALSA: usb-audio: Check mixer unit descriptors more strictly Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 21/65] ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 22/65] ALSA: usb-audio: Always check descriptor sizes in parser code Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 23/65] srcu: Lock srcu_data structure in srcu_gp_start() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 24/65] driver core: Add missing dev->bus->need_parent_lock checks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 25/65] Fix failure path in alloc_pid() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 26/65] block: deactivate blk_stat timer in wbt_disable_default() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 27/65] block: mq-deadline: Fix write completion handling Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 28/65] dm: do not allow readahead to limit IO size Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 29/65] dlm: fixed memory leaks after failed ls_remove_names allocation Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 30/65] dlm: possible memory leak on error path in create_lkb() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 31/65] dlm: lost put_lkb on error path in receive_convert() and receive_unlock() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 32/65] dlm: memory leaks on error path in dlm_user_request() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 33/65] gfs2: Get rid of potential double-freeing in gfs2_create_inode Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 34/65] gfs2: Fix loop in gfs2_rbm_find Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 35/65] b43: Fix error in cordic routine Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 36/65] selinux: policydb - fix byte order and alignment issues Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 37/65] PCI / PM: Allow runtime PM without callback functions Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 38/65] lockd: Show pid of lockd for remote locks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 39/65] xprtrdma: Yet another double DMA-unmap Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 40/65] nfsd4: zero-length WRITE should succeed Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 41/65] Revert "powerpc/tm: Unset MSR[TS] if not recheckpointing" Greg Kroah-Hartman
2019-01-12 21:35   ` Christoph Biedl
2019-01-13  7:11     ` Greg Kroah-Hartman
2019-01-14  0:00       ` Michael Ellerman
2019-01-14  8:10         ` Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 42/65] powerpc/tm: Set MSR[TS] just prior to recheckpoint Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 43/65] iio: adc: qcom-spmi-adc5: Initialize prescale properly Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 44/65] iio: dac: ad5686: fix bit shift read register Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 45/65] 9p/net: put a lower bound on msize Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 46/65] rxe: fix error completion wr_id and qp_num Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 47/65] stm class: Fix a module refcount leak in policy creation error path Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 48/65] RDMA/srpt: Fix a use-after-free in the channel release code Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 49/65] RDMA/iwcm: Dont copy past the end of dev_name() string Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 50/65] iommu/vt-d: Handle domain agaw being less than iommu agaw Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 51/65] sched/fair: Fix infinite loop in update_blocked_averages() by reverting a9e7f6544b9c Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 52/65] ceph: dont update importing caps mseq when handing cap export Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 53/65] video: fbdev: pxafb: Fix "WARNING: invalid free of devm_ allocated data" Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 54/65] drivers/perf: hisi: Fixup one DDRC PMU register offset Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 55/65] powerpc/4xx/ocm: Fix compilation error due to PAGE_KERNEL usage Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 56/65] selftests: Fix test errors related to lib.mk khdr target Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 57/65] genwqe: Fix size check Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 58/65] intel_th: msu: Fix an off-by-one in attribute store Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 59/65] power: supply: olpc_battery: correct the temperature units Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 60/65] of: of_node_get()/of_node_put() nodes held in phandle cache Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 61/65] of: __of_detach_node() - remove node from " Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 62/65] lib: fix build failure in CONFIG_DEBUG_VIRTUAL test Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 63/65] drm/nouveau/drm/nouveau: Check rc from drm_dp_mst_topology_mgr_resume() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 64/65] drm/vc4: Set ->is_yuv to false when num_planes == 1 Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 65/65] drm/rockchip: psr: do not dereference encoder before it is null checked Greg Kroah-Hartman
2019-01-11 21:35 ` [PATCH 4.20 00/65] 4.20.2-stable review shuah
2019-01-12  8:03   ` Greg Kroah-Hartman
2019-01-12  8:28 ` Naresh Kamboju
2019-01-12 17:35   ` Greg Kroah-Hartman
2019-01-12 17:45 ` Guenter Roeck

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