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

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Date:   Tue, 28 Sep 2021 19:51:16 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>, 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



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.


>   		map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
>   		v += PAGE_SIZE;
>   		p += PAGE_SIZE;
> 




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