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

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Date:   Tue, 15 Jan 2019 21:22:32 +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 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.

So I won't object if you send them as-is.

cheers