linux-kernel - Re: [PATCH] livepatch: Remove klp_arch_set

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Date:   Thu, 2 Jun 2022 12:50:39 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Petr Mladek <pmladek@...e.com>
CC:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] livepatch: Remove klp_arch_set_pc() and asm/livepatch.h

Hi Petr,

Le 23/05/2022 à 17:15, Petr Mladek a écrit :
> On Mon 2022-05-23 06:51:47, Christophe Leroy wrote:
>>
>>
>> Le 29/03/2022 à 13:22, Petr Mladek a écrit :
>>> On Mon 2022-03-28 08:26:48, Christophe Leroy wrote:
>>>> All three versions of klp_arch_set_pc() do exactly the same: they
>>>> call ftrace_instruction_pointer_set().
>>>>
>>>> Call ftrace_instruction_pointer_set() directly and remove
>>>> klp_arch_set_pc().
>>>>
>>>> As klp_arch_set_pc() was the only thing remaining in asm/livepatch.h
>>>> on x86 and s390, remove asm/livepatch.h
>>>>
>>>> livepatch.h remains on powerpc but its content is exclusively used
>>>> by powerpc specific code.
>>>>
>>>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
>>>
>>> Acked-by: Petr Mladek <pmladek@...e.com>
>>>
>>> I am going to take it via livepatch/livepatch.git for 5.19. We are
>>> already in the middle of the merge window and this is not critical.
>>>
>>
>> I haven't seen it in linux-next.
>>
>> Do you still plan to take it for 5.19 ?
> 
> Thanks a lot for pointing this out. I have completely forgot about
> this patch /o\
> 
> I have just pushed it into livepatching/livepatching.git,
> branch for-5.19/cleanup.
> 
> I am going to create pull request for 5.19 by the end of this week
> after it gets a spin in linux-next.
> 

I can't see it yet in linus mainline tree. Any issue ?

Thanks
Christophe