linux-kernel - Re: [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup to SHT

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Message-Id: <C605557D-951C-4FA7-9CE2-940B92FD198D@linux.alibaba.com>
Date:   Fri, 7 Aug 2020 12:22:56 +0800
From:   changhuaixin <changhuaixin@...ux.alibaba.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     changhuaixin <changhuaixin@...ux.alibaba.com>, bp@...en8.de,
        hpa@...or.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, luto@...capital.net,
        michal.lkml@...kovi.net, mingo@...hat.com,
        Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
        x86@...nel.org, yamada.masahiro@...ionext.com, jpoimboe@...hat.com
Subject: Re: [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup
 to SHT_PROGBITS



> On Aug 6, 2020, at 11:08 PM, Ingo Molnar <mingo@...nel.org> wrote:
> 
> 
> * changhuaixin <changhuaixin@...ux.alibaba.com> wrote:
> 
>> Hi, Ingo
>> 
>> Another way to write SHT_PROGBITS is using elf_create_section to write orc_lookup table headers, when orc_unwind_ip table and orc_unwind table are written. Is this a better solution?
>> 
>> diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
>> index 3f98dcfbc177..860d4dcec8e6 100644
>> --- a/tools/objtool/orc_gen.c
>> +++ b/tools/objtool/orc_gen.c
>> @@ -183,6 +183,10 @@ int create_orc_sections(struct objtool_file *file)
>>        u_sec = elf_create_section(file->elf, ".orc_unwind",
>>                                   sizeof(struct orc_entry), idx);
>> 
>> +       /* make flags of section orc_lookup right */
>> +       if (!elf_create_section(file->elf, ".orc_lookup", sizeof(int), 0))
>> +               return -1;
>> +
>>        /* populate sections */
>>        idx = 0;
>>        for_each_sec(file, sec) {
> 
> Looks much nicer IMO.
> 
> Mind turning this into a proper patch that does it plus reverts the 
> hack?
> 
A new patchset is sent.

Thanks,
huaixin

> Thanks,
> 
> 	Ingo