linux-kernel - Re: [PATCH v9] kallsyms: Add self-test facility

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Message-ID: <66ec4021-b633-09ba-73ee-b24cdb3fa25a@huawei.com>
Date:   Fri, 16 Dec 2022 17:36:30 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        <linux-modules@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        David Laight <David.Laight@...lab.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH v9] kallsyms: Add self-test facility



On 2022/12/16 15:42, Leizhen (ThunderTown) wrote:
> 
> 
> On 2022/12/15 22:51, Geert Uytterhoeven wrote:
>> Hi Zhen,
>>
>>
>> On 30f3bb09778de64 with your debug patch v2:
> 
> I've set up the qemu environment, and I'll try to solve it by tomorrow at the latest.

It seems that the problem is still strcmp(). After I commented strcmp() in
arch/m68k/include/asm/string.h, and force it to use the one in lib/string.c,
it works well.

The output i=0, because compare_symbol_name() always return zero in below loop.
'low' decreases to 0, then the loop ends.
The reason is not clear. I'm still analyzing it.

        low = mid;
        while (low) {
                seq = get_symbol_seq(low - 1);
                off = get_symbol_offset(seq);
                kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
                if (compare_symbol_name(name, namebuf))
                        break;
                low--;
        }
        *start = low;


> 
>>
>>
>> Gr{oetje,eeting}s,
>>
>>                         Geert
>>
>> --
>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>>
>> In personal conversations with technical people, I call myself a hacker. But
>> when I'm talking to journalists I just say "programmer" or something like that.
>>                                 -- Linus Torvalds
>>
>> .
>>
> 

-- 
Regards,
  Zhen Lei