arm64: fix padding computation in struct ucontext

The expression to compute the padding needed to fill the uc_sigmask field
to 1024 bits actually computes the padding needed for 1080 bits.
Fortunately, due to the 16-byte alignment of the following field
(uc_mcontext) the definition in glibc contains enough bytes of padding
after uc_sigmask so that the overall offsets and size match in both
definitions.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/ucontext.h b/arch/arm64/include/asm/ucontext.h
index bde960720892a694bda151a3288c9ecd30c8954d..42e04c87742837e1e204492a3a675dfae29fea4f 100644 (file)
--- a/arch/arm64/include/asm/ucontext.h
+++ b/arch/arm64/include/asm/ucontext.h
@@ -22,7 +22,7 @@ struct ucontext {
        stack_t           uc_stack;
        sigset_t          uc_sigmask;
        /* glibc uses a 1024-bit sigset_t */
-       __u8              __unused[(1024 - sizeof(sigset_t)) / 8];
+       __u8              __unused[1024 / 8 - sizeof(sigset_t)];
        /* last for future expansion */
        struct sigcontext uc_mcontext;
 };