From: Franck Bui-Huu <fbuihuu@gmail.com>
Date: Fri, 29 Sep 2006 09:08:59 +0000 (+0200)
Subject: [MIPS] Let gcc align 'struct pt_regs' on 8 bytes boundary
X-Git-Tag: v3.12-rc1~32941^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0e90f49b112e4c91dee7d61eccc06bcd25b9c534;p=kernel%2Fkernel-generic.git

[MIPS] Let gcc align 'struct pt_regs' on 8 bytes boundary

The stack pointer in MIPS/gcc should always 8 bytes aligned on
entry to any routines. Therefore pt_regs structure must be
aligned to 8-byte boundary too.

Instead of creating dummy fields to achieve this alignment, this
patch let gcc doing it. Therefore 'smtc_pad' field can be safely
removed.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/include/asm-mips/ptrace.h b/include/asm-mips/ptrace.h
index 4fb0fc4..5f3a907 100644
--- a/include/asm-mips/ptrace.h
+++ b/include/asm-mips/ptrace.h
@@ -44,9 +44,8 @@ struct pt_regs {
 	unsigned long cp0_epc;
 #ifdef CONFIG_MIPS_MT_SMTC
 	unsigned long cp0_tcstatus;
-	unsigned long smtc_pad;
 #endif /* CONFIG_MIPS_MT_SMTC */
-};
+} __attribute__ ((aligned (8)));
 
 /* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */
 #define PTRACE_GETREGS		12