linux-kernel - Re: [PATCH] sh: Implement __get_user_u64() required for 64-bit get

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Date:   Sun, 28 Jun 2020 00:26:01 +0900
From:   Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     linux-sh@...r.kernel.org, Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>,
        NIIBE Yutaka <gniibe@...j.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: Implement __get_user_u64() required for 64-bit get_user()

On Thu, 11 Jun 2020 16:58:11 +0900,
John Paul Adrian Glaubitz wrote:
> 
> Trying to build the kernel with CONFIG_INFINIBAND_USER_ACCESS enabled fails
> 
>      ERROR: "__get_user_unknown" [drivers/infiniband/core/ib_uverbs.ko] undefined!
> 
> with on SH since the kernel misses a 64-bit implementation of get_user().
> 
> Implement the missing 64-bit get_user() as __get_user_u64(), matching the
> already existing __put_user_u64() which implements the 64-bit put_user().
> 
> Signed-off-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> ---
>  arch/sh/include/asm/uaccess_32.h | 53 ++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/arch/sh/include/asm/uaccess_32.h b/arch/sh/include/asm/uaccess_32.h
> index 624cf55acc27..5d7ddc092afd 100644
> --- a/arch/sh/include/asm/uaccess_32.h
> +++ b/arch/sh/include/asm/uaccess_32.h
> @@ -26,6 +26,9 @@ do {								\
>  	case 4:							\
>  		__get_user_asm(x, ptr, retval, "l");		\
>  		break;						\
> +	case 8:							\
> +		__get_user_u64(x, ptr, retval);			\
> +		break;						\
>  	default:						\
>  		__get_user_unknown();				\
>  		break;						\
> @@ -66,6 +69,56 @@ do {							\
>  
>  extern void __get_user_unknown(void);
>  
> +#if defined(CONFIG_CPU_LITTLE_ENDIAN)
> +#define __get_user_u64(x, addr, err) \
> +({ \
> +__asm__ __volatile__( \
> +	"1:\n\t" \
> +	"mov.l	%2,%R1\n\t" \
> +	"mov.l	%T2,%S1\n\t" \
> +	"2:\n" \
> +	".section	.fixup,\"ax\"\n" \
> +	"3:\n\t" \
> +	"mov  #0,%R1\n\t"   \
> +	"mov  #0,%S1\n\t"   \
> +	"mov.l	4f, %0\n\t" \
> +	"jmp	@%0\n\t" \
> +	" mov	%3, %0\n\t" \
> +	".balign	4\n" \
> +	"4:	.long	2b\n\t" \
> +	".previous\n" \
> +	".section	__ex_table,\"a\"\n\t" \
> +	".long	1b, 3b\n\t" \
> +	".long	1b + 2, 3b\n\t" \
> +	".previous" \
> +	:"=&r" (err), "=&r" (x) \
> +	:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
> +#else
> +#define __get_user_u64(x, addr, err) \
> +({ \
> +__asm__ __volatile__( \
> +	"1:\n\t" \
> +	"mov.l	%2,%S1\n\t" \
> +	"mov.l	%T2,%R1\n\t" \
> +	"2:\n" \
> +	".section	.fixup,\"ax\"\n" \
> +	"3:\n\t" \
> +	"mov  #0,%S1\n\t"   \
> +	"mov  #0,%R1\n\t"   \
> +	"mov.l	4f, %0\n\t" \
> +	"jmp	@%0\n\t" \
> +	" mov	%3, %0\n\t" \
> +	".balign	4\n" \
> +	"4:	.long	2b\n\t" \
> +	".previous\n" \
> +	".section	__ex_table,\"a\"\n\t" \
> +	".long	1b, 3b\n\t" \
> +	".long	1b + 2, 3b\n\t" \
> +	".previous" \
> +	:"=&r" (err), "=&r" (x) \
> +	:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
> +#endif
> +
>  #define __put_user_size(x,ptr,size,retval)		\
>  do {							\
>  	retval = 0;					\
> -- 
> 2.27.0
> 

Acked-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>

-- 
Yosinori Sato