Hi!

On Wed, Apr 15, 2020 at 09:25:59AM +0000, Christophe Leroy wrote:
> +#define __put_user_goto(x, ptr, label) \
> +     __put_user_nocheck_goto((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), 
> label)

This line gets too long, can you break it up somehow?

> +#define __put_user_asm_goto(x, addr, label, op)                      \
> +     asm volatile goto(                                      \
> +             "1:     " op "%U1%X1 %0,%1      # put_user\n"   \
> +             EX_TABLE(1b, %l2)                               \
> +             :                                               \
> +             : "r" (x), "m" (*addr)                          \
> +             :                                               \
> +             : label)

Same "%Un" problem as in the other patch.  You could use "m<>" here,
but maybe just dropping "%Un" is better.

> +#ifdef __powerpc64__
> +#define __put_user_asm2_goto(x, ptr, label)                  \
> +     __put_user_asm_goto(x, ptr, label, "std")
> +#else /* __powerpc64__ */
> +#define __put_user_asm2_goto(x, addr, label)                 \
> +     asm volatile goto(                                      \
> +             "1:     stw%U1%X1 %0, %1\n"                     \
> +             "2:     stw%U1%X1 %L0, %L1\n"                   \
> +             EX_TABLE(1b, %l2)                               \
> +             EX_TABLE(2b, %l2)                               \
> +             :                                               \
> +             : "r" (x), "m" (*addr)                          \
> +             :                                               \
> +             : label)
> +#endif /* __powerpc64__ */

Here, you should drop it for sure.

Rest looks fine.

Reviewed-by: Segher Boessenkool <seg...@kernel.crashing.org>


Segher

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