Commit 386e7906 authored Dec 12, 2013 by Axel Lin Committed by Linus Torvalds Dec 12, 2013

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>

parent eb3c2272

include/linux/kernel.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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) { }