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

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Date:	Sun, 09 Dec 2012 17:03:39 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.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

Yes, if you add a * it becomes an array of pointers.

Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

>(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++)
>>>>
>> 

-- 
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