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

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Date:	Mon, 25 Nov 2013 16:09:52 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Ralf Baechle <ralf@...ux-mips.org>
CC:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: Fix build error seen in some configurations

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' [-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>

> ---
>   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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