Message-ID: <555F7E20.3040903@imgtec.com>
Date: Fri, 22 May 2015 12:06:08 -0700
From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
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To: Ralf Baechle <ralf@linux-mips.org>
CC: <linux-mips@linux-mips.org>, <rusty@rustcorp.com.au>,
        <alexinbeijing@gmail.com>, <paul.burton@imgtec.com>,
        <david.daney@cavium.com>, <alex@alex-smith.me.uk>,
        <linux-kernel@vger.kernel.org>, <james.hogan@imgtec.com>,
        <markos.chandras@imgtec.com>, <macro@linux-mips.org>,
        <eunb.song@samsung.com>, <manuel.lauss@gmail.com>,
        <andreas.herrmann@caviumnetworks.com>
Subject: Re: [PATCH 1/2] MIPS: MSA: bugfix - disable MSA during thread switch
 correctly
References: <20150519211222.35859.52798.stgit@ubuntu-yegoshin> <20150519211351.35859.80332.stgit@ubuntu-yegoshin> <20150522093812.GH6941@linux-mips.org> <555F776E.3070904@imgtec.com>
In-Reply-To: <555F776E.3070904@imgtec.com>
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Ralf,

If there was TIF_USEDMSA in "prev" task then it means that all MSA HW is 
in use.
And switch_to() checks this and transfers it to resume() to indicate 
that MSA processing should be done.

Macro call "msa_save_all    a0" right before disabling MSA in Config5 
does a save of MSA registers. If it doesn't cause an exception then it 
means that Config5 does exist and Config5.MIPS_CONF5_MSAEN does exist too.

- Leonid.

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