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| author | Arjun Roy <arjunroy@google.com> | 2020-06-25 20:30:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-26 00:27:37 -0700 |
| commit | 7f70c2a68a51496289df163f6969d4db7c383f30 (patch) | |
| tree | 9acf8e8fac975ee9a01806f2f03273fab17bf98d /mm/debug_vm_pgtable.c | |
| parent | 243bce09c91b0145aeaedd5afba799d81841c030 (diff) | |
| download | lwn-7f70c2a68a51496289df163f6969d4db7c383f30.tar.gz lwn-7f70c2a68a51496289df163f6969d4db7c383f30.zip | |
mm/memory.c: properly pte_offset_map_lock/unlock in vm_insert_pages()
Calls to pte_offset_map() in vm_insert_pages() are erroneously not
matched with a call to pte_unmap(). This would cause problems on
architectures where that is not a no-op.
This patch does away with the non-traditional locking in the existing
code, and instead uses pte_offset_map_lock/unlock() as usual,
incrementing PTE as necessary. The PTE pointer is kept within bounds
since we clamp it with PTRS_PER_PTE.
Link: http://lkml.kernel.org/r/20200618220446.20284-1-arjunroy.kdev@gmail.com
Fixes: 8cd3984d81d5 ("mm/memory.c: add vm_insert_pages()")
Signed-off-by: Arjun Roy <arjunroy@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/debug_vm_pgtable.c')
0 files changed, 0 insertions, 0 deletions