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Date: Wed, 26 Feb 2020 06:10:22 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Jason Yan <yanaijie@...wei.com>, mpe@...erman.id.au,
linuxppc-dev@...ts.ozlabs.org, diana.craciun@....com,
benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com,
keescook@...omium.org, kernel-hardening@...ts.openwall.com, oss@...error.net
Cc: linux-kernel@...r.kernel.org, zhaohongjiang@...wei.com
Subject: Re: [PATCH v3 3/6] powerpc/fsl_booke/64: implement KASLR for
fsl_booke64
Le 26/02/2020 à 04:33, Jason Yan a écrit :
>
>
> 在 2020/2/26 10:40, Jason Yan 写道:
>>
>>
>> 在 2020/2/20 21:48, Christophe Leroy 写道:
>>>
>>>
>>> Le 06/02/2020 à 03:58, Jason Yan a écrit :
> Hi Christophe,
>
> When using a standard C if/else, all code compiled for PPC32 and PPC64,
> but this will bring some build error because not all variables both
> defined for PPC32 and PPC64.
>
> [yanaijie@138 linux]$ sh ppc64build.sh
> CALL scripts/atomic/check-atomics.sh
> CALL scripts/checksyscalls.sh
> CHK include/generated/compile.h
> CC arch/powerpc/mm/nohash/kaslr_booke.o
> arch/powerpc/mm/nohash/kaslr_booke.c: In function 'kaslr_choose_location':
> arch/powerpc/mm/nohash/kaslr_booke.c:341:30: error:
> 'CONFIG_LOWMEM_CAM_NUM' undeclared (first use in this function); did you
> mean 'CONFIG_FLATMEM_MANUAL'?
> ram = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, true);
> ^~~~~~~~~~~~~~~~~~~~~
> CONFIG_FLATMEM_MANUAL
This one has to remain inside an #ifdef. That's the only one that has to
remain.
> arch/powerpc/mm/nohash/kaslr_booke.c:341:30: note: each undeclared
> identifier is reported only once for each function it appears in
> arch/powerpc/mm/nohash/kaslr_booke.c: In function 'kaslr_early_init':
> arch/powerpc/mm/nohash/kaslr_booke.c:404:3: error: 'is_second_reloc'
In mmu_decl.h, put the declaration outside the #ifdef CONFIG_PPC32
> undeclared (first use in this function); did you mean '__cond_lock'?
> is_second_reloc = 1;
> ^~~~~~~~~~~~~~~
> __cond_lock
> arch/powerpc/mm/nohash/kaslr_booke.c:411:4: error: implicit declaration
> of function 'create_kaslr_tlb_entry'; did you mean 'reloc_kernel_entry'?
Same, put the declaration outside of the #ifdef
> [-Werror=implicit-function-declaration]
> create_kaslr_tlb_entry(1, tlb_virt, tlb_phys);
> ^~~~~~~~~~~~~~~~~~~~~~
> reloc_kernel_entry
> cc1: all warnings being treated as errors
> make[3]: *** [scripts/Makefile.build:268:
> arch/powerpc/mm/nohash/kaslr_booke.o] Error 1
> make[2]: *** [scripts/Makefile.build:505: arch/powerpc/mm/nohash] Error 2
> make[1]: *** [scripts/Makefile.build:505: arch/powerpc/mm] Error 2
> make: *** [Makefile:1681: arch/powerpc] Error 2
See the patch I sent you. It builds ok for me.
Christophe
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