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mm, hmm: use devm semantics for hmm_devmem_{add, remove}

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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>
This commit is contained in:
Dan Williams 2018-12-28 00:35:07 -08:00 • committed by Linus Torvalds
parent 69324b8f48
commit 58ef15b765
2 changed files with 28 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/hmm.h
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@ -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_ops *ops,
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