linux-kernel - [tip:x86/urgent] x32, siginfo: Provide proper overrides for x32 siginfo

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Date:	Mon, 23 Apr 2012 16:50:29 -0700
From:	"tip-bot for H. Peter Anvin" <hpa@...ux.intel.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	bruce.j.beare@...el.com, arnd@...db.de, tglx@...utronix.de,
	hjl.rools@...il.com, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x32, siginfo:
  Provide proper overrides for x32 siginfo_t

Commit-ID:  045b09a0be388ece1469aa02f17252e57c95093e
Gitweb:     http://git.kernel.org/tip/045b09a0be388ece1469aa02f17252e57c95093e
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Mon, 23 Apr 2012 16:34:12 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Mon, 23 Apr 2012 16:36:45 -0700

x32, siginfo: Provide proper overrides for x32 siginfo_t

Provide the proper override macros for x32 siginfo_t.  The combination
of a special type here and an overall alignment constraint actually
ends up with all the types being properly aligned, but the hack is
needed to keep the substructures inside siginfo_t from adding padding.

Note: use __attribute__((aligned())) since __aligned() is not exported
to user space.

Reported-by: H.J. Lu <hjl.rools@...il.com>
Cc: Bruce J. Beare <bruce.j.beare@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
Link: http://lkml.kernel.org/r/CAMe9rOqF6Kh6-NK7oP0Fpzkd4SBAWU%2BG53hwBbSD4iA2UzyxuA@mail.gmail.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/include/asm/siginfo.h |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/siginfo.h b/arch/x86/include/asm/siginfo.h
index fc1aa55..073d445 100644
--- a/arch/x86/include/asm/siginfo.h
+++ b/arch/x86/include/asm/siginfo.h
@@ -2,7 +2,13 @@
 #define _ASM_X86_SIGINFO_H
 
 #ifdef __x86_64__
-# define __ARCH_SI_PREAMBLE_SIZE	(4 * sizeof(int))
+# ifdef __ILP32__ /* x32 */
+typedef long long __kernel_si_clock_t __attribute__((aligned(4)));
+#  define __ARCH_SI_CLOCK_T		__kernel_si_clock_t;
+#  define __ARCH_SI_ATTRIBUTES		__attribute__((aligned(8)))
+# else /* x86-64 */
+#  define __ARCH_SI_PREAMBLE_SIZE	(4 * sizeof(int))
+# endif
 #endif
 
 #include <asm-generic/siginfo.h>
--
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