linux-kernel - Re: [PATCH 1/2] x86/asm/entry/64: Tidy up JZ insns after TESTs

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Message-ID: <553F5B6E.4040307@redhat.com>
Date:	Tue, 28 Apr 2015 12:05:34 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/asm/entry/64: Tidy up JZ insns after TESTs

On 04/28/2015 12:16 AM, H. Peter Anvin wrote:
> On 04/27/2015 06:21 AM, Denys Vlasenko wrote:
>>
>> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
>> index e952f6b..8f8b22a 100644
>> --- a/arch/x86/kernel/entry_64.S
>> +++ b/arch/x86/kernel/entry_64.S
>> @@ -666,7 +666,7 @@ END(irq_entries_start)
>>  	leaq -RBP(%rsp),%rdi	/* arg1 for \func (pointer to pt_regs) */
>>  
>>  	testl $3, CS-RBP(%rsp)
>> -	je 1f
>> +	jz	1f
>>  	SWAPGS
>>  1:
> 
> Please don't insert tabs between opcode and operand unless that is the
> style of the surrounding code.

The next patch inserts tab in the preceding TEST insn too,
converting entire mini-block of code to "tab" style.

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