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Re: [PATCH] mips: Fix build error seen in some configurations

To: Guenter Roeck <>, Ralf Baechle <>
Subject: Re: [PATCH] mips: Fix build error seen in some configurations
From: David Daney <>
Date: Mon, 25 Nov 2013 16:09:52 -0800
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On 11/25/2013 03:21 PM, Guenter Roeck wrote:
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' 
cc1: all warnings being treated as errors

Fixes: c0ff3c53d4f9 ('MIPS: Enable HAVE_ARCH_TRACEHOOK')
Signed-off-by: Guenter Roeck <>

Acked-by: David Daney <>

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

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 81c8913..33e8dbf 100644
--- 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 task_struct *task,
  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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