diff options
| author | David Howells <dhowells@redhat.com> | 2006-01-06 00:11:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:33 -0800 |
| commit | 7ee1dd3fee22f15728f545d266403fc977e1eb99 (patch) | |
| tree | e2f9f42b0731d5006fa329a590069be6787af1de /kernel/futex.c | |
| parent | 5c40f7f373889930d176a515ec375b60a70b5b49 (diff) | |
| download | lwn-7ee1dd3fee22f15728f545d266403fc977e1eb99.tar.gz lwn-7ee1dd3fee22f15728f545d266403fc977e1eb99.zip | |
[PATCH] FRV: Make futex code compilable on nommu [try #2]
Make the futex code compilable and usable on NOMMU by making the attempt to
handle page faults conditional on CONFIG_MMU. If this is not enabled, then
we can assume that EFAULT returned from futex_atomic_op_inuser() is not
recoverable, and that the address lies outside of valid memory.
handle_mm_fault() is made to BUG if called on NOMMU without attempting to
invoke the actual handler (__handle_mm_fault).
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/futex.c')
| -rw-r--r-- | kernel/futex.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 5e71a6bf6f6b..5efa2f978032 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -356,6 +356,13 @@ retry: if (bh1 != bh2) spin_unlock(&bh2->lock); +#ifndef CONFIG_MMU + /* we don't get EFAULT from MMU faults if we don't have an MMU, + * but we might get them from range checking */ + ret = op_ret; + goto out; +#endif + if (unlikely(op_ret != -EFAULT)) { ret = op_ret; goto out; |