linux-kernel - Re: [PATCH v2 2/4] MIPS: VDSO: Add implementation of clock

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Message-ID: <20170706140911.GG6973@jhogan-linux.le.imgtec.org>
Date:   Thu, 6 Jul 2017 15:09:12 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     "Maciej W. Rozycki" <macro@...tec.com>
CC:     Aleksandar Markovic <aleksandar.markovic@...rk.com>,
        <linux-mips@...ux-mips.org>,
        Goran Ferenc <goran.ferenc@...tec.com>,
        Miodrag Dinic <miodrag.dinic@...tec.com>,
        Aleksandar Markovic <aleksandar.markovic@...tec.com>,
        Douglas Leung <douglas.leung@...tec.com>,
        <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...tec.com>,
        Petar Jovanovic <petar.jovanovic@...tec.com>,
        Raghu Gandham <raghu.gandham@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH v2 2/4] MIPS: VDSO: Add implementation of clock_gettime()
 fallback

On Thu, Jul 06, 2017 at 02:12:37PM +0100, Maciej W. Rozycki wrote:
> On Thu, 6 Jul 2017, James Hogan wrote:
> > > (and would have to forcibly use the 32-bit encoding in the microMIPS
> > > case)?
> > 
> > I don't believe there is a 16-bit SYSCALL encoding in microMIPS, at
> > least I can't see one in the 5.04 manual.
> 
>  I referred to the preceding instruction, presumably LI, that does have a 
> 16-bit variant in the microMIPS instruction set.

Ah yes, I see what you mean.

Hopefully microMIPS support is new enough for that not to matter.

It appears that the restart behaviour was improved in v2.6.36 in commit
8f5a00eb422e ("MIPS: Sanitize restart logics"), whereas first mentions
of micromips are in v3.9, in commit f8fa4811dbb2 ("MIPS: Add support for
the M14KEc core.").

Cheers
James

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