Re: [PATCH] powerpc/32: Remove redundant test in transfer_to_handler()

[Christophe LEROY <christophe.leroy@c-s.fr>]

Le 14/04/2017 à 15:31, Christophe Leroy a écrit :
> As stated in the comment on top of transfer_to_handler(),
> all callers set cr0.eq if the exception occurred in kernel mode
> (i.e. MSR:PR = 0)
>
> Therefore, it is not needed to do the test again

Indeed, all callers set cr0.eq as required .... except that some of
them just destroy it by inserting another test before calling 
transfer_to_handler().

So this patch cannot be applied as is at the time being.

Christophe

>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
>  arch/powerpc/kernel/entry_32.S | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
> index a38600949f3a..0651a7438fa6 100644
> --- a/arch/powerpc/kernel/entry_32.S
> +++ b/arch/powerpc/kernel/entry_32.S
> @@ -141,7 +141,6 @@ transfer_to_handler:
>  	stw	r2,GPR2(r11)
>  	stw	r12,_NIP(r11)
>  	stw	r9,_MSR(r11)
> -	andi.	r2,r9,MSR_PR
>  	mfctr	r12
>  	mfspr	r2,SPRN_XER
>  	stw	r12,_CTR(r11)
>