linux-kernel - Re: math_state_restore and kernel_fpu

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Message-ID: <20140119113555.30961.qmail@science.horizon.com>
Date:	19 Jan 2014 06:35:55 -0500
From:	"George Spelvin" <linux@...izon.com>
To:	nate@...tsmathematics.com
Cc:	adilger@...ger.ca, jack@...e.cz, linux@...izon.com,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: math_state_restore and kernel_fpu_end disable interrupts?

THANK YOU!

I've been having a problem with ext4 metadata checksums, which use SSE
for large blocks, and traced it to kernel_fpu_end() disabling interrupts,
but had paused to debug this (I assumed well-tested) piece of kernel
code before pushing it harder.

(Search October-December LKML archives for "3.11.4: kernel BUG at
fs/buffer.c:1268".")

No, I'm pretty sure it's a real bug.  At least, it's biting me on the
ass.

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