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mm/hmm: improve and rename hmm_vma_fault() to hmm_range_fault()

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Minor optimization around hmm_pte_need_fault().  Rename for consistency
between code, comments and documentation.  Also improves the comments on
all the possible returns values.  Improve the function by returning the
number of populated entries in pfns array.

Link: http://lkml.kernel.org/r/20190403193318.16478-6-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jérôme Glisse
2019-05-13 17:19:58 -07:00
committed by Linus Torvalds
parent 25f23a0c71
commit 73231612dc
3 changed files with 52 additions and 60 deletions
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13
include/linux/hmm.h
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@@ -391,7 +391,18 @@ bool hmm_vma_range_done(struct hmm_range *range);
*
* See the function description in mm/hmm.c for further documentation.
*/
int hmm_vma_fault(struct hmm_range *range, bool block);
long hmm_range_fault(struct hmm_range *range, bool block);
/* This is a temporary helper to avoid merge conflict between trees. */
static inline int hmm_vma_fault(struct hmm_range *range, bool block)
{
long ret = hmm_range_fault(range, block);
if (ret == -EBUSY)
ret = -EAGAIN;
else if (ret == -EAGAIN)
ret = -EBUSY;
return ret < 0 ? ret : 0;
}
/* Below are for HMM internal use only! Not to be used by device driver! */
void hmm_mm_destroy(struct mm_struct *mm);