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| author | Chris Wright <chrisw@osdl.org> | 2005-06-21 17:14:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-21 18:46:16 -0700 |
| commit | 73219d178051691a56d57184d8c7f6d0cbe3c5c1 (patch) | |
| tree | c527691510f5a2b757eac424c5671704084fc9eb /mm/mmap.c | |
| parent | 1363c3cd8603a913a27e2995dccbd70d5312d8e6 (diff) | |
| download | lwn-73219d178051691a56d57184d8c7f6d0cbe3c5c1.tar.gz lwn-73219d178051691a56d57184d8c7f6d0cbe3c5c1.zip | |
[PATCH] mmap topdown fix for large stack limit, large allocation
The topdown changes in 2.6.12-rc1 can cause large allocations with large
stack limit to fail, despite there being space available. The
mmap_base-len is only valid when len >= mmap_base. However, nothing in
topdown allocator checks this. It's only (now) caught at higher level,
which will cause allocation to simply fail. The following change restores
the fallback to bottom-up path, which will allow large allocations with
large stack limit to potentially still succeed.
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 9da23c1ef9dc..da3fa90a0aae 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1267,6 +1267,9 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, return (mm->free_area_cache = addr-len); } + if (mm->mmap_base < len) + goto bottomup; + addr = mm->mmap_base-len; do { @@ -1288,6 +1291,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, addr = vma->vm_start-len; } while (len < vma->vm_start); +bottomup: /* * A failed mmap() very likely causes application failure, * so fall back to the bottom-up function here. This scenario |