Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: Re: [PATCH v9] kallsyms: Add self-test facility
From:   "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>
To:     Geert Uytterhoeven <geert@linux-m68k.org>
CC:     Josh Poimboeuf <jpoimboe@kernel.org>,
        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Petr Mladek <pmladek@suse.com>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        <live-patching@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        <linux-modules@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        David Laight <David.Laight@aculab.com>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>
References: <20221115083349.1662-1-thunder.leizhen@huawei.com>
 <CAMuHMdWM6+pC3yUqy+hHRrAf1BCz2sz1KQv2zxS+Wz-639X-aA@mail.gmail.com>
 <ad09966d-9357-1c32-e491-a402af8dac6e@huawei.com>
 <CAMuHMdW=KXfYc3Rqz6LizJcDxRX3BzUFTPpdTpDB68sw+QPJ=A@mail.gmail.com>
 <b00bcc04-0633-bac9-76ab-572f9470901c@huawei.com>
 <CAMuHMdWPSeieR-sGuozd3kWGjVw85EV40irqM9aErXufifzFNA@mail.gmail.com>
 <49070ac3-02bb-a3b3-b929-ede07e3b2c95@huawei.com>
 <e81710a9-2c45-0724-ec5f-727977202858@huawei.com>
 <CAMuHMdWAAQNJd21fhodDONb40LFMae3V_517iT22FykCqG90Og@mail.gmail.com>
 <4aaede14-8bd3-6071-f17b-7efcb5f0de42@huawei.com>
Message-ID: <66ec4021-b633-09ba-73ee-b24cdb3fa25a@huawei.com>
Date:   Fri, 16 Dec 2022 17:36:30 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.7.0
MIME-Version: 1.0
In-Reply-To: <4aaede14-8bd3-6071-f17b-7efcb5f0de42@huawei.com>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk


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@linux-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