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Message-ID: <51c3944e-5570-4e76-a7ac-c89b30c4c989@email.android.com>
Date: Sun, 09 Dec 2012 17:34:27 -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: [PATCH v2] arch/x86/tools/gen-insn-attr-x86.awk: remove duplicate const
You're changing the array from an array of insn_attr_t to pointers to insn_attr_t?
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
>(2012/12/10 10:03), H. Peter Anvin wrote:
>> Yes, if you add a * it becomes an array of pointers.
>
>Right, I would like to make each pointer in the array read-only.
>
>And, of course, the data itself which pointed by the pointer
>is already protected.
>You can see this in (builddir)/arch/x86/lib/inat_table.c
>----
>/* Table: 2-byte opcode (0x0f) */
>const insn_attr_t inat_escape_table_1[INAT_OPCODE_TABLE_SIZE] = {
>[...]
>/* Escape opcode map array */
>const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX +
>1][INAT_LSTPFX_MAX +
> 1] = {
> [1][0] = inat_escape_table_1,
>----
>
>So I think Cong's v3 is good :)
>
>Thank you,
>
>>
>> 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++)
>>>>>>
>>>>
>>
--
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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