diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2022-10-21 19:41:08 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-09 19:29:20 +0100 |
| commit | 0f0892356fa174bdd8bd655c820ee3658c4c9f01 (patch) | |
| tree | 905f8673a7c67c1947fd197fba64e935cbec53b4 /mm/hugetlb.c | |
| parent | block: Fix some kernel-doc comments (diff) | |
| download | linux-0f0892356fa174bdd8bd655c820ee3658c4c9f01.tar.xz linux-0f0892356fa174bdd8bd655c820ee3658c4c9f01.zip | |
mm: allow multiple error returns in try_grab_page()
In order to add checks for P2PDMA memory into try_grab_page(), expand
the error return from a bool to an int/error code. Update all the
callsites handle change in usage.
Also remove the WARN_ON_ONCE() call at the callsites seeing there
already is a WARN_ON_ONCE() inside the function if it fails.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221021174116.7200-2-logang@deltatee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 546df97c31e4..67f39550520e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -7243,14 +7243,15 @@ retry: page = pte_page(pte) + ((address & ~huge_page_mask(h)) >> PAGE_SHIFT); /* - * try_grab_page() should always succeed here, because: a) we - * hold the pmd (ptl) lock, and b) we've just checked that the - * huge pmd (head) page is present in the page tables. The ptl - * prevents the head page and tail pages from being rearranged - * in any way. So this page must be available at this point, - * unless the page refcount overflowed: + * try_grab_page() should always be able to get the page here, + * because: a) we hold the pmd (ptl) lock, and b) we've just + * checked that the huge pmd (head) page is present in the + * page tables. The ptl prevents the head page and tail pages + * from being rearranged in any way. So this page must be + * available at this point, unless the page refcount + * overflowed: */ - if (WARN_ON_ONCE(!try_grab_page(page, flags))) { + if (try_grab_page(page, flags)) { page = NULL; goto out; } @@ -7288,7 +7289,7 @@ retry: pte = huge_ptep_get((pte_t *)pud); if (pte_present(pte)) { page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); - if (WARN_ON_ONCE(!try_grab_page(page, flags))) { + if (try_grab_page(page, flags)) { page = NULL; goto out; } |