linux-kernel - Re: [PATCH v4 14/23] powerpc/syscall: Save r3 in regs->orig

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Date:   Mon, 8 Feb 2021 18:47:00 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Nicholas Piggin <npiggin@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>, msuchanek@...e.de,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 14/23] powerpc/syscall: Save r3 in regs->orig_r3



Le 26/01/2021 à 11:18, Nicholas Piggin a écrit :
> Excerpts from Christophe Leroy's message of January 26, 2021 12:48 am:
>> Save r3 in regs->orig_r3 in system_call_exception()
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
>> ---
>>   arch/powerpc/kernel/entry_64.S | 1 -
>>   arch/powerpc/kernel/syscall.c  | 2 ++
>>   2 files changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
>> index aa1af139d947..a562a4240aa6 100644
>> --- a/arch/powerpc/kernel/entry_64.S
>> +++ b/arch/powerpc/kernel/entry_64.S
>> @@ -278,7 +278,6 @@ END_BTB_FLUSH_SECTION
>>   	std	r10,_LINK(r1)
>>   	std	r11,_TRAP(r1)
>>   	std	r12,_CCR(r1)
>> -	std	r3,ORIG_GPR3(r1)
>>   	addi	r10,r1,STACK_FRAME_OVERHEAD
>>   	ld	r11,exception_marker@toc(r2)
>>   	std	r11,-16(r10)		/* "regshere" marker */
> 
> This misses system_call_vectored.

Oops yes, this patch was cooked before SCV where introduced. Fixes in v5.

Thanks
Christophe