linux-kernel - [C/R v20][PATCH 88/96] use correct ccr bit for syscall error status

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Message-Id: <1268842164-5590-89-git-send-email-orenl@cs.columbia.edu>
Date:	Wed, 17 Mar 2010 12:09:16 -0400
From:	Oren Laadan <orenl@...columbia.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	containers@...ts.linux-foundation.org, Nathan Lynch <ntl@...ox.com>
Subject: [C/R v20][PATCH 88/96] use correct ccr bit for syscall error status

From: Nathan Lynch <ntl@...ox.com>

The powerpc implementations of syscall_get_error and
syscall_set_return_value should use CCR0:S0 (0x10000000) for testing
and setting syscall error status.  Fortunately these APIs don't seem
to be used at the moment.

Signed-off-by: Nathan Lynch <ntl@...ox.com>
Acked-by: Serge E. Hallyn <serue@...ibm.com>
---
 arch/powerpc/include/asm/syscall.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
index efa7f0b..23913e9 100644
--- a/arch/powerpc/include/asm/syscall.h
+++ b/arch/powerpc/include/asm/syscall.h
@@ -30,7 +30,7 @@ static inline void syscall_rollback(struct task_struct *task,
 static inline long syscall_get_error(struct task_struct *task,
 				     struct pt_regs *regs)
 {
-	return (regs->ccr & 0x1000) ? -regs->gpr[3] : 0;
+	return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0;
 }
 
 static inline long syscall_get_return_value(struct task_struct *task,
@@ -44,10 +44,10 @@ static inline void syscall_set_return_value(struct task_struct *task,
 					    int error, long val)
 {
 	if (error) {
-		regs->ccr |= 0x1000L;
+		regs->ccr |= 0x10000000L;
 		regs->gpr[3] = -error;
 	} else {
-		regs->ccr &= ~0x1000L;
+		regs->ccr &= ~0x10000000L;
 		regs->gpr[3] = val;
 	}
 }
-- 
1.6.3.3

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