[PATCH] POWER: Add context-synchronizing instructions to pkey_write [BZ #25954]

[Paul E Murphy]

On 5/11/20 5:12 AM, Florian Weimer via Libc-alpha wrote:

> @@ -37,7 +37,7 @@ pkey_read (void)
>   static inline void
>   pkey_write (unsigned long int value)
>   {
> -  __asm__ volatile ("mtspr 13, %0" : : "r" (value));
> +  __asm__ volatile ("isync; mtspr 13, %0; isync" : : "r" (value));
>   }
> 
>   /* Number of the largest supported key.  This depends on the width of

LGTM.