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[PATCH] FRV: Make futex code compilable on nommu [try #2]

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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>
This commit is contained in:
David Howells 2006-01-06 00:11:44 -08:00 • committed by Linus Torvalds
parent 5c40f7f373
commit 7ee1dd3fee
2 changed files with 26 additions and 3 deletions
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7
kernel/futex.c
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@ -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;