linux-kernel - Re: [PATCH] mbcache: LLVMLinux: Remove double calculation from mbcache

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Message-ID: <536087D5.1040409@zytor.com>
Date:	Tue, 29 Apr 2014 22:19:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	behanw@...verseincode.com, viro@...iv.linux.org.uk
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, dwmw2@...radead.org,
	Mark Charlebois <charlebm@...il.com>
Subject: Re: [PATCH] mbcache: LLVMLinux: Remove double calculation from mbcache

On 04/29/2014 06:13 PM, H. Peter Anvin wrote:
> I suspect this will generate FP instructions on x86 which will corrupt user space state.  This is thus a critical bug!!

It looks like at least x86-64 gcc does the evaluation at compile time
and there aren't any fp instructions left in the code. However, it
should still be fixed.

	-hpa

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