linux-kernel - [PATCH 3.13 27/46] MIPS: Fix build error seen in some configurations

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Message-Id: <20140328173138.320067821@linuxfoundation.org>
Date:	Fri, 28 Mar 2014 10:32:11 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	David Daney <david.daney@...ium.com>,
	John Crispin <blogic@...nwrt.org>
Subject: [PATCH 3.13 27/46] MIPS: Fix build error seen in some configurations

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit 63238f2cc5518e1c45a3418fc0ac0f560dafe7ef upstream.

The following build error is seen if CONFIG_32BIT is undefined,
CONFIG_64BIT is defined, and CONFIG_MIPS32_O32 is undefined.

asm/syscall.h: In function 'mips_get_syscall_arg':
arch/mips/include/asm/syscall.h:32:16: error: unused variable 'usp' [-Werror=unused-variable]
cc1: all warnings being treated as errors

Fixes: c0ff3c53d4f9 ('MIPS: Enable HAVE_ARCH_TRACEHOOK')
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: David Daney <david.daney@...ium.com>
Signed-off-by: John Crispin <blogic@...nwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6160/
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/include/asm/syscall.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -29,7 +29,7 @@ static inline long syscall_get_nr(struct
 static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
 	struct task_struct *task, struct pt_regs *regs, unsigned int n)
 {
-	unsigned long usp = regs->regs[29];
+	unsigned long usp __maybe_unused = regs->regs[29];
 
 	switch (n) {
 	case 0: case 1: case 2: case 3:


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