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Message-ID: <1382088475.16935.4.camel@phoenix>
Subject: Build error for nommu if CONFIG_DEBUG_ATOMIC_SLEEP is selected
From: Axel Lin <axel.lin@ingics.com>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        "Michael S. Tsirkin" <mst@redhat.com>
Date: Fri, 18 Oct 2013 17:27:55 +0800
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Hi Michael,

I got below build error for nommu if CONFIG_DEBUG_ATOMIC_SLEEP is selected.
Also got the same build error if CONFIG_PROVE_LOCKING is selected.

Seems this issue is introduced by commit 662bbcb2747c2
"mm, sched: Allow uaccess in atomic with pagefault_disable()".

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/signal.c:174: undefined reference to `might_fault'
arch/arm/kernel/signal.c:175: undefined reference to `might_fault'
arch/arm/kernel/signal.c:176: 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

Regards,
Axel