linux-kernel - Re: [PATCH v2] ARM: module: Add all unwind tables when load module

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Date:   Fri, 1 Apr 2022 10:10:30 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
CC:     <alexander.sverdlin@...ia.com>, <ardb@...nel.org>,
        <linus.walleij@...aro.org>, <nico@...xnic.net>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: module: Add all unwind tables when load module

Very appreciate for your patient review! For my first patch it really 
helps a lot :D

v3 update pushed now.

Sorry forgot CC for last mail.


On 2022/3/31 18:38, Russell King (Oracle) wrote:
> On Thu, Mar 31, 2022 at 05:09:09PM +0800, Chen Zhongjin wrote:
>>   	for (s = sechdrs; s < sechdrs_end; s++) {
>>   		const char *secname = secstrs + s->sh_name;
>> +		const Elf_Shdr *txt_sec = find_mod_section(hdr, sechdrs,
>> +				strcmp(".ARM.exidx", secname) ?
>> +				secname + strlen(".ARM.exidx") : ".text");
> In addition to my comments on the above...
>
>>   
>> -		if (!(s->sh_flags & SHF_ALLOC))
>> +		if (!(s->sh_flags & SHF_ALLOC) ||
>> +			s->sh_type != ELF_SECTION_UNWIND)
> Please align "s->sh_type" with the ! on the line above (don't use a tab
> for this!)
>
>>   			continue;
>>   
>> -		if (strcmp(".ARM.exidx.init.text", secname) == 0)
>> -			maps[ARM_SEC_INIT].unw_sec = s;
>> -		else if (strcmp(".ARM.exidx", secname) == 0)
>> -			maps[ARM_SEC_CORE].unw_sec = s;
>> -		else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
>> -			maps[ARM_SEC_EXIT].unw_sec = s;
>> -		else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
>> -			maps[ARM_SEC_UNLIKELY].unw_sec = s;
>> -		else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
>> -			maps[ARM_SEC_HOT].unw_sec = s;
>> -		else if (strcmp(".init.text", secname) == 0)
>> -			maps[ARM_SEC_INIT].txt_sec = s;
>> -		else if (strcmp(".text", secname) == 0)
>> -			maps[ARM_SEC_CORE].txt_sec = s;
>> -		else if (strcmp(".exit.text", secname) == 0)
>> -			maps[ARM_SEC_EXIT].txt_sec = s;
>> -		else if (strcmp(".text.unlikely", secname) == 0)
>> -			maps[ARM_SEC_UNLIKELY].txt_sec = s;
>> -		else if (strcmp(".text.hot", secname) == 0)
>> -			maps[ARM_SEC_HOT].txt_sec = s;
>> +		if (txt_sec) {
>> +			struct unwind_table *table =
>> +				unwind_table_add(s->sh_addr,
>> +						s->sh_size,
>> +						txt_sec->sh_addr,
>> +						txt_sec->sh_size);
> blank line here please.
>
>> +			list_add(&table->mod_list, &unwind_list->mod_list);
> and here.
>
> Otherwise, looks good. Thanks.
>