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The only reason uaccess routines might sleep is if they fault. Make this explicit. Arnd Bergmann suggested that the following code if (!is_kernel_addr((unsigned long)__pu_addr)) might_fault(); can be further simplified by adding a version of might_fault that includes the kernel addr check. Will be considered as a further optimization in future. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1369577426-26721-7-git-send-email-mst@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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