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authorDmitry Safonov2020-12-14 19:08:05 -0800
committerLinus Torvalds2020-12-15 12:13:41 -0800
commit51df7bcb61518d933beb5c2dfe8251d651ca4259 (patch)
tree5526784592ca133622dc4b2b9f95b35a67747f35 /mm/mremap.c
parent0966aeb404e854e3377a10fcd01be46f19055bc6 (diff)
mm/mremap: account memory on do_munmap() failure
Patch series "mremap: move_vma() fixes". This patch (of 6): move_vma() copies VMA without adding it to account, then unmaps old part of VMA. On failure it unmaps the new VMA. With hacks accounting in munmap is disabled as it's a copy of existing VMA. Account the memory on munmap() failure which was previously copied into a new VMA. Link: https://lkml.kernel.org/r/20201013013416.390574-1-dima@arista.com Link: https://lkml.kernel.org/r/20201013013416.390574-2-dima@arista.com Fixes: commit e2ea83742133 ("[PATCH] mremap: move_vma fixes and cleanup") Signed-off-by: Dmitry Safonov <dima@arista.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Brian Geffon <bgeffon@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 078f731277b6..975a14c4a24e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -600,7 +600,8 @@ static unsigned long move_vma(struct vm_area_struct *vma,
if (do_munmap(mm, old_addr, old_len, uf_unmap) < 0) {
/* OOM: unable to split vma, just get accounts right */
- vm_unacct_memory(excess >> PAGE_SHIFT);
+ if (vm_flags & VM_ACCOUNT)
+ vm_acct_memory(new_len >> PAGE_SHIFT);
excess = 0;
}