linux-kernel - Re: [PATCH v2 00/15] powerpc/32s: Use BATs/LTLBs for STRICT_KERNEL

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Message-ID: <87ftsi7fwi.fsf@concordia.ellerman.id.au>
Date:   Thu, 21 Feb 2019 00:23:09 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Jonathan Neuschäfer 
        <j.neuschaefer@....net>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 00/15] powerpc/32s: Use BATs/LTLBs for STRICT_KERNEL_RWX

Christophe Leroy <christophe.leroy@....fr> writes:

> Le 15/01/2019 à 11:22, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@....fr> writes:
>>> Le 15/01/2019 à 01:33, Jonathan Neuschäfer a écrit :
>> ...
>>>>
>>>> - patches 7 to 11 fail to build with this error (really a warning, but
>>>>     arch/powerpc doesn't allow warnings by default):
>>>>
>>>> 	  CC      arch/powerpc/mm/ppc_mmu_32.o
>>>> 	../arch/powerpc/mm/ppc_mmu_32.c:133:13: error: ‘clearibat’ defined but not used [-Werror=unused-function]
>>>> 	 static void clearibat(int index)
>>>> 		     ^~~~~~~~~
>>>> 	../arch/powerpc/mm/ppc_mmu_32.c:115:13: error: ‘setibat’ defined but not used [-Werror=unused-function]
>>>> 	 static void setibat(int index, unsigned long virt, phys_addr_t phys,
>>>> 		     ^~~~~~~
>>>> 	cc1: all warnings being treated as errors
>>>
>>> Argh ! I have to squash the patch bringing the new functions with the
>>> one using them (patch 12). The result is a big messy patch which is more
>>> difficult to review but that's life.
>> 
>> You don't *have* to squash them.
>> 
>> We like to preserve bisectability, but it's not a 100% hard requirement.
>> 
>> Someone trying to bisect through those patches can always turn off
>> -Werror with PPC_DISABLE_WERROR. But they probably can just skip them
>> because they just add new code that's not called yet.
>
> Ok thanks for the note.
>
>> 
>> So I won't object if you send them as-is.
>
> Good to know. Anyway I think I will at least re-order so that the patch 
> using the new functions immediatly follows the one adding the functions.
 
Based on that I'm expecting a v3 of this series, right?

cheers