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mm/memory.c: make apply_to_page_range() more robust

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Arm and arm64 used to trigger this BUG_ON() - this has now been fixed.

But a WARN_ON() here is sufficient to catch future buggy callers.

Signed-off-by: Mika Penttilä <mika.penttila@nextfour.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mika Penttilä 2016-03-15 14:56:45 -07:00 committed by Linus Torvalds
parent 4355c018c2
commit 9cb65bc3b1
1 changed files with 3 additions and 1 deletions
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mm/memory.c
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@ -1876,7 +1876,9 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
unsigned long end = addr + size;
int err;
BUG_ON(addr >= end);
if (WARN_ON(addr >= end))
return -EINVAL;
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end);