linux-kernel - Re: [PATCH v3 9/9] powerpc/mm: Use is_kernel_text() and is_kernel

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Date:   Wed, 29 Sep 2021 09:14:30 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>, <arnd@...db.de>,
        <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <rostedt@...dmis.org>,
        <mingo@...hat.com>, <davem@...emloft.net>, <ast@...nel.org>,
        <ryabinin.a.a@...il.com>, <akpm@...ux-foundation.org>
CC:     <bpf@...r.kernel.org>, <paulus@...ba.org>
Subject: Re: [PATCH v3 9/9] powerpc/mm: Use is_kernel_text() and
 is_kernel_inittext() helper



On 2021/9/29 1:51, Christophe Leroy wrote:
> 
> 
> Le 26/09/2021 à 09:20, Kefeng Wang a écrit :
>> Use is_kernel_text() and is_kernel_inittext() helper to simplify code,
>> also drop etext, _stext, _sinittext, _einittext declaration which
>> already declared in section.h.
>>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: linuxppc-dev@...ts.ozlabs.org
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>>   arch/powerpc/mm/pgtable_32.c | 7 ++-----
>>   1 file changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
>> index dcf5ecca19d9..13c798308c2e 100644
>> --- a/arch/powerpc/mm/pgtable_32.c
>> +++ b/arch/powerpc/mm/pgtable_32.c
>> @@ -33,8 +33,6 @@
>>   #include <mm/mmu_decl.h>
>> -extern char etext[], _stext[], _sinittext[], _einittext[];
>> -
>>   static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data;
>>   notrace void __init early_ioremap_init(void)
>> @@ -104,14 +102,13 @@ static void __init __mapin_ram_chunk(unsigned 
>> long offset, unsigned long top)
>>   {
>>       unsigned long v, s;
>>       phys_addr_t p;
>> -    int ktext;
>> +    bool ktext;
>>       s = offset;
>>       v = PAGE_OFFSET + s;
>>       p = memstart_addr + s;
>>       for (; s < top; s += PAGE_SIZE) {
>> -        ktext = ((char *)v >= _stext && (char *)v < etext) ||
>> -            ((char *)v >= _sinittext && (char *)v < _einittext);
>> +        ktext = (is_kernel_text(v) || is_kernel_inittext(v));
> 
> I think we could use core_kernel_next() instead.
Indead. oops, sorry for the build error, will update, thanks.

> 
> Build failure on mpc885_ads_defconfig
> 
> arch/powerpc/mm/pgtable_32.c: In function '__mapin_ram_chunk':
> arch/powerpc/mm/pgtable_32.c:111:26: error: implicit declaration of 
> function 'is_kernel_text'; did you mean 'is_kernel_inittext'? 
> [-Werror=implicit-function-declaration]
>    111 |                 ktext = (is_kernel_text(v) || 
> is_kernel_inittext(v));
>        |                          ^~~~~~~~~~~~~~
>        |                          is_kernel_inittext
> cc1: all warnings being treated as errors
> make[2]: *** [scripts/Makefile.build:277: arch/powerpc/mm/pgtable_32.o] 
> Error 1
> make[1]: *** [scripts/Makefile.build:540: arch/powerpc/mm] Error 2
> make: *** [Makefile:1868: arch/powerpc] Error 2
> 
> 
> .