linux-kernel - Re: [PATCH] powerpc/fsl_booke/32: fix build with CONFIG_RANDOMIZE

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Date:   Sun, 14 Jun 2020 04:20:25 +0700
From:   Arseny Solokha <asolokha@...kras.ru>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Arseny Solokha <asolokha@...kras.ru>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jason Yan <yanaijie@...wei.com>,
        <linuxppc-dev@...ts.ozlabs.org>, Scott Wood <oss@...error.net>,
        Christophe Leroy <christophe.leroy@....fr>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH] powerpc/fsl_booke/32: fix build with CONFIG_RANDOMIZE_BASE

> Le 13/06/2020 à 18:28, Arseny Solokha a écrit :
>> Building the current 5.8 kernel for a e500 machine with
>> CONFIG_RANDOMIZE_BASE set yields the following failure:
>>
>>    arch/powerpc/mm/nohash/kaslr_booke.c: In function 'kaslr_early_init':
>>    arch/powerpc/mm/nohash/kaslr_booke.c:387:2: error: implicit declaration
>> of function 'flush_icache_range'; did you mean 'flush_tlb_range'?
>> [-Werror=implicit-function-declaration]
>>
>> Indeed, including asm/cacheflush.h into kaslr_booke.c fixes the build.
>>
>> The issue dates back to the introduction of that file and probably went
>> unnoticed because there's no in-tree defconfig with CONFIG_RANDOMIZE_BASE
>> set.
>
> I don't get this problem with mpc85xx_defconfig + RELOCATABLE +
> RANDOMIZE_BASE.

Ah, OK. So the critical difference between mpc85xx_defconfig and our custom
config is that the former sets CONFIG_BLOCK while ours doesn't. Then we have the
following dependence chain:

arch/powerpc/mm/nohash/kaslr_booke.c
  include/linux/swap.h
    include/linux/memcontrol.h
      include/linux/writeback.h
        include/linux/blk-cgroup.h
          include/linux/blkdev.h

          #ifdef CONFIG_BLOCK
          #include <linux/pagemap.h>
          #endif

          include/linux/pagemap.h
            include/linux/highmem.h
              arch/powerpc/include/asm/cacheflush.h

and that's how the latter doesn't get included in
arch/powerpc/mm/nohash/kaslr_booke.c, because in our config CONFIG_BLOCK is not
defined in the first place.

Arseny

> Christophe
>
>>
>> Fixes: 2b0e86cc5de6 ("powerpc/fsl_booke/32: implement KASLR infrastructure")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Arseny Solokha <asolokha@...kras.ru>
>> ---
>>   arch/powerpc/mm/nohash/kaslr_booke.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c
>> index 4a75f2d9bf0e..bce0e5349978 100644
>> --- a/arch/powerpc/mm/nohash/kaslr_booke.c
>> +++ b/arch/powerpc/mm/nohash/kaslr_booke.c
>> @@ -14,6 +14,7 @@
>>   #include <linux/memblock.h>
>>   #include <linux/libfdt.h>
>>   #include <linux/crash_core.h>
>> +#include <asm/cacheflush.h>
>>   #include <asm/pgalloc.h>
>>   #include <asm/prom.h>
>>   #include <asm/kdump.h>
>>