linux-kernel - Re: [PATCH v2 15/15] x86: convert to setup_initial_init

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Date:   Tue, 8 Jun 2021 09:39:54 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, <x86@...nel.org>
Subject: Re: [PATCH v2 15/15] x86: convert to setup_initial_init_mm()


On 2021/6/8 8:26, Andrew Morton wrote:
> On Fri, 4 Jun 2021 15:06:33 +0800 Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
>> Use setup_initial_init_mm() helper to simplify code.
>>
>> ...
>>
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -868,10 +868,7 @@ void __init setup_arch(char **cmdline_p)
>>   
>>   	if (!boot_params.hdr.root_flags)
>>   		root_mountflags &= ~MS_RDONLY;
>> -	init_mm.start_code = (unsigned long) _text;
>> -	init_mm.end_code = (unsigned long) _etext;
>> -	init_mm.end_data = (unsigned long) _edata;
>> -	init_mm.brk = _brk_end;
>> +	setup_initial_init_mm(_text, _etext, _edata, _brk_end);
>>   
>>   	code_resource.start = __pa_symbol(_text);
>>   	code_resource.end = __pa_symbol(_etext)-1;
> arch/x86/kernel/setup.c:873:47: warning: passing argument 4 of 'setup_initial_init_mm' makes pointer from integer without a cast [-Wint-conversion]
>    873 |  setup_initial_init_mm(_text, _etext, _edata, _brk_end);
>        |                                               ^~~~~~~~
>        |                                               |
>        |                                               long unsigned int
> In file included from ./include/linux/pid_namespace.h:7,
>                   from ./include/linux/ptrace.h:10,
>                   from ./include/linux/elfcore.h:11,
>                   from ./include/linux/crash_core.h:6,
>                   from ./include/linux/kexec.h:18,
>                   from ./include/linux/crash_dump.h:5,
>                   from arch/x86/kernel/setup.c:9:
> ./include/linux/mm.h:248:29: note: expected 'void *' but argument is of type 'long unsigned int'
>    248 |       void *end_data, void *brk);
>        |                       ~~~~~~^~~
>
>
> afaict the other architectures will warn this way, not sure.

I check all archs again, the x86/m68k/powerpc/h8300 has use some value 
which is not pointer ,

other are changed, but forget this one.  I do compile, but I don't know 
why I missed it, sorry about

this.


>
> Please check all that, refresh ,retest and resend?
> .
>