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| author | Matt Mackall <mpm@selenic.com> | 2008-10-08 21:51:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-09 21:18:27 +0200 |
| commit | 70096a561d1e09120bae1f293f3632cedbfd5c68 (patch) | |
| tree | 6c5f7474089ceeff06aa515a5b39cb38e7318efe /mm | |
| parent | Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus (diff) | |
| download | linux-70096a561d1e09120bae1f293f3632cedbfd5c68.tar.xz linux-70096a561d1e09120bae1f293f3632cedbfd5c68.zip | |
SLOB: fix bogus ksize calculation fix
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slob.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/slob.c b/mm/slob.c index 62b679dc660f..cb675d126791 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -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; } |