linux-kernel - Re: Re: [PATCH v2] arch/x86/tools/gen-insn-attr-x86.awk: remove duplicate const

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Message-ID: <50C53441.7050802@hitachi.com>
Date:	Mon, 10 Dec 2012 10:00:49 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Cong Ding <dinggnu@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: Re: [PATCH v2] arch/x86/tools/gen-insn-attr-x86.awk: remove
 duplicate const

(2012/12/10 0:50), H. Peter Anvin wrote:
> No, that would really be wrong - changing the type.

What would be wrong? IMHO, this is just a fix to add a fool
proof 'const' to array instance itself.
...Or, am I missed anything?

Thank you,

> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> 
>> (2012/12/08 8:17), Cong Ding wrote:
>>>>>>>> Patch description please?
>>>>>>> there are 2 consts in the definition of one variable
>>>>>>>
>>>>>>
>>>>>> Please put in an actual patch description.  The first line
>> (subject
>>>>>> line) is a title; the patch should make sense without it.
>>>>> sorry for that. so like this is fine?
>>>>>
>>>>
>>>> Well, except that typically you should explain which variable it is.
>>>> Yes, it is obvious if you look at the patch, but you're making the
>>>> reader spend a few more moments than necessary.
>>>>
>>>> Also, you should explain what the harm is -- if it breaks anything
>>>> or is just a cosmetic issue.
>>> sorry again for lacking of experience...
>>> and I missed another same error, so send version 2.
>>
>> Ah, sorry for my mistake. I would like to make both the value
>> pointed by the pointers and the pointers itself read-only.
>> Thus the right way of the patch should be;
>>
>> -	print "const insn_attr_t const *inat_escape_tables[INAT_ESC_MAX + 1]"
>> \
>> +	print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX +
>> 1]" \
>>
>> Cong, could you update your patch? then I can Ack that.
>>
>> Thank you,
>>
>>>
>>> - cong
>>> ---
>>> From 6cf729b913287a6fc06325ca75ccf0efff9274e8 Mon Sep 17 00:00:00
>> 2001
>>> From: Cong Ding <dinggnu@...il.com>
>>> Date: Fri, 7 Dec 2012 23:14:32 +0000
>>> Subject: [PATCH] arch/x86/tools/gen-insn-attr-x86.awk: remove
>> duplicate const
>>>
>>> fix the following sparse warning:
>>> arch/x86/lib/inat-tables.c:1080:25: warning: duplicate const
>>> arch/x86/lib/inat-tables.c:1095:25: warning: duplicate const
>>> arch/x86/lib/inat-tables.c:1118:25: warning: duplicate const
>>>
>>> for variable inat_escape_tables, inat_group_tables, and
>> inat_avx_tables
>>>
>>> Signed-off-by: Cong Ding <dinggnu@...il.com>
>>> ---
>>>  arch/x86/tools/gen-insn-attr-x86.awk |    6 +++---
>>>  1 files changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/arch/x86/tools/gen-insn-attr-x86.awk
>> b/arch/x86/tools/gen-insn-attr-x86.awk
>>> index ddcf39b..987c7b2 100644
>>> --- a/arch/x86/tools/gen-insn-attr-x86.awk
>>> +++ b/arch/x86/tools/gen-insn-attr-x86.awk
>>> @@ -356,7 +356,7 @@ END {
>>>  		exit 1
>>>  	# print escape opcode map's array
>>>  	print "/* Escape opcode map array */"
>>> -	print "const insn_attr_t const *inat_escape_tables[INAT_ESC_MAX +
>> 1]" \
>>> +	print "const insn_attr_t *inat_escape_tables[INAT_ESC_MAX + 1]" \
>>>  	      "[INAT_LSTPFX_MAX + 1] = {"
>>>  	for (i = 0; i < geid; i++)
>>>  		for (j = 0; j < max_lprefix; j++)
>>> @@ -365,7 +365,7 @@ END {
>>>  	print "};\n"
>>>  	# print group opcode map's array
>>>  	print "/* Group opcode map array */"
>>> -	print "const insn_attr_t const *inat_group_tables[INAT_GRP_MAX +
>> 1]"\
>>> +	print "const insn_attr_t *inat_group_tables[INAT_GRP_MAX + 1]"\
>>>  	      "[INAT_LSTPFX_MAX + 1] = {"
>>>  	for (i = 0; i < ggid; i++)
>>>  		for (j = 0; j < max_lprefix; j++)
>>> @@ -374,7 +374,7 @@ END {
>>>  	print "};\n"
>>>  	# print AVX opcode map's array
>>>  	print "/* AVX opcode map array */"
>>> -	print "const insn_attr_t const *inat_avx_tables[X86_VEX_M_MAX +
>> 1]"\
>>> +	print "const insn_attr_t *inat_avx_tables[X86_VEX_M_MAX + 1]"\
>>>  	      "[INAT_LSTPFX_MAX + 1] = {"
>>>  	for (i = 0; i < gaid; i++)
>>>  		for (j = 0; j < max_lprefix; j++)
>>>
> 


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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