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authorAxel Lin <axel.lin@ingics.com>2013-12-12 17:12:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-12 18:19:26 -0800
commit386e79066f04850352f144e67edfd5b636c0f95c (patch)
tree3944d1346d3209e713b6768d1a0c28c520639a4f
parenteb3c227289840eed95ddfb0516046f08d8993940 (diff)
include/linux/kernel.h: make might_fault() a nop for !MMU
The machine cannot fault if !MUU, so make might_fault() a nop for !MMU. This fixes below build error if !CONFIG_MMU && (CONFIG_PROVE_LOCKING=y || CONFIG_DEBUG_ATOMIC_SLEEP=y): arch/arm/kernel/built-in.o: In function `arch_ptrace': arch/arm/kernel/ptrace.c:852: undefined reference to `might_fault' arch/arm/kernel/built-in.o: In function `restore_sigframe': arch/arm/kernel/signal.c:173: undefined reference to `might_fault' ... arch/arm/kernel/built-in.o:arch/arm/kernel/signal.c:177: more undefined references to `might_fault' follow make: *** [vmlinux] Error 1 Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/kernel.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d4e98d13eff4..ecb87544cc5d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -193,7 +193,8 @@ extern int _cond_resched(void);
(__x < 0) ? -__x : __x; \
})
-#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)
+#if defined(CONFIG_MMU) && \
+ (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP))
void might_fault(void);
#else
static inline void might_fault(void) { }