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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-01-09 10:18:50 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-01-09 10:18:50 +0100
commitd8ad075ef60ca33f1bd8e227eed2202108fd6cd8 (patch)
treeaf7763b3cef733e8b98c72067aa457d74af33f5b /arch/s390/lib/uaccess_std.c
parentde338a3795bbcb3c3d77591f65118cbec776cc39 (diff)
[S390] don't call handle_mm_fault() if in an atomic context.
There are several places in the futex code where a spin_lock is held and still uaccesses happen. Deadlocks are avoided by increasing the preempt count. The pagefault handler will then not take any locks but will immediately search the fixup tables. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib/uaccess_std.c')
-rw-r--r--arch/s390/lib/uaccess_std.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c
index bbaca66fa29..56a0214e992 100644
--- a/arch/s390/lib/uaccess_std.c
+++ b/arch/s390/lib/uaccess_std.c
@@ -258,8 +258,6 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
{
int oldval = 0, newval, ret;
- pagefault_disable();
-
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("lr %2,%5\n",
@@ -284,7 +282,6 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
default:
ret = -ENOSYS;
}
- pagefault_enable();
*old = oldval;
return ret;
}