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SLOB: fix bogus ksize calculation fix

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This fixes the previous fix, which was completely wrong on closer
inspection. This version has been manually tested with a user-space
test harness and generates sane values. A nearly identical patch has
been boot-tested.

The problem arose from changing how kmalloc/kfree handled alignment
padding without updating ksize to match. This brings it in sync.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matt Mackall 2008-10-08 14:51:57 -05:00 committed by Linus Torvalds
parent 69849375d6
commit 70096a561d
1 changed files with 5 additions and 3 deletions
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8
mm/slob.c
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@ -514,9 +514,11 @@ size_t ksize(const void *block)
return 0;
sp = (struct slob_page *)virt_to_page(block);
if (slob_page(sp))
return (((slob_t *)block - 1)->units - 1) * SLOB_UNIT;
else
if (slob_page(sp)) {
int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
unsigned int *m = (unsigned int *)(block - align);
return SLOB_UNITS(*m) * SLOB_UNIT;
} else
return sp->page.private;
}