linux-kernel - Re: [PATCH] x86/entry: Improve system call entry comments

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Message-ID: <56DF1E4F.6050809@zytor.com>
Date:	Tue, 8 Mar 2016 10:47:43 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Brian Gerst <brgerst@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/entry: Improve system call entry comments

On 03/08/16 10:45, Andy Lutomirski wrote:
> 
> s/modern/most, perhaps?
> 
> I'm hoping that some day Bionic goes away and gets replaced by musl.
> 
> Of course, musl doesn't always use fast syscalls because it needs a
> vdso facility that doesn't currently exist.  I'll deal with that
> eventually.
> 

You don't actually need actual DSO support to support fast system calls
on i386.  Even klibc uses them now, and the additional code to support
it is trivial.

	-hpa