linux-kernel - Re: [PATCH 2/9] x86/asm/entry/32: Use PUSH instructions to build pt

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Message-ID: <20150401085140.GC23916@gmail.com>
Date:	Wed, 1 Apr 2015 10:51:40 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	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 2/9] x86/asm/entry/32: Use PUSH instructions to build
 pt_regs on stack


* Denys Vlasenko <dvlasenk@...hat.com> wrote:

> This mimics the recent similar 64-bit change.
> Saves ~110 bytes of code.
> 
> Patch was run-tested on 32 and 64 bits, Intel and AMD CPU.
> I also looked at the diff of entry_64.o disassembly, to have
> a different view of the changes.

The other important question would be: what performance difference (if 
any) did you observe before/after the change?

Thanks,

	Ingo
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