Christophe Leroy <christophe.le...@c-s.fr> writes:
> After reactivation of data translation by modifying MSR[DR], a isync
> is required to ensure the translation is effective.
>
> Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
> ---
> Rebased on powerpc/merge-test
>
> @mpe: If not too late:
> - change to head_32.h should be squashed into "powerpc/32: prepare for
> CONFIG_VMAP_STACK"
> - change to head_32.S should be squashed into "powerpc/32s: Enable
> CONFIG_VMAP_STACK"
>
> Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
> ---
> arch/powerpc/kernel/head_32.S | 1 +
> arch/powerpc/kernel/head_32.h | 2 ++
> 2 files changed, 3 insertions(+)
>
> diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
> index 73a035b40dbf..a6a5fbbf8504 100644
> --- a/arch/powerpc/kernel/head_32.h
> +++ b/arch/powerpc/kernel/head_32.h
> @@ -43,6 +43,7 @@
> .ifeq \for_rtas
> li r11, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */
> mtmsr r11
> + isync
Actually this one leads to:
/home/michael/linux/arch/powerpc/kernel/head_8xx.S: Assembler messages:
/home/michael/linux/arch/powerpc/kernel/head_8xx.S:151: Error: attempt to
move .org backwards
make[3]: *** [/home/michael/linux/scripts/Makefile.build:348:
arch/powerpc/kernel/head_8xx.o] Error 1
For mpc885_ads_defconfig.
That's the alignment exception overflowing into the program check
handler:
/* Alignment exception */
. = 0x600
Alignment:
EXCEPTION_PROLOG handle_dar_dsisr=1
save_dar_dsisr_on_stack r4, r5, r11
li r6, RPN_PATTERN
mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
Can't see an obvious/easy way to fix it.
cheers
> .endif
> subi r11, r1, INT_FRAME_SIZE /* use r1 if kernel */
> #else
