linux-kernel - Re: [RFC PATCH] Drop some asm from copy_user

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Message-ID: <20150513104330.GG1517@pd.tnic>
Date:	Wed, 13 May 2015 12:43:30 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Lutomirski <luto@...capital.net>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] Drop some asm from copy_user_64.S

On Wed, May 13, 2015 at 12:31:40PM +0200, Ingo Molnar wrote:
> So why should an alternatives-CALL, inlined directly into call sites,
> cost more kernel space?

Not the alternatives CALL alone but inlining _copy_*_user with all the
preparation glue around it would. Basically what we're doing currently.

See how uninlining copy_user_generic() dropped text size from 12375798 to
12269658.

But let me do some more staring...

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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