aio: mark __aio_sigset::sigmask const

io_pgetevents() will not change the signal mask.  Mark it const to make
it clear and to reduce the need for casts in user code.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Avi Kivity <avi@scylladb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[hch: reapply the patch that got incorrectly reverted]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
index d4e768d..3c5038b 100644 (file)
--- a/include/uapi/linux/aio_abi.h
+++ b/include/uapi/linux/aio_abi.h
@@ -111,7 +111,7 @@ struct iocb {
 #undef IFLITTLE
 
 struct __aio_sigset {
-       sigset_t __user *sigmask;
+       const sigset_t __user   *sigmask;
        size_t          sigsetsize;
 };