linux-kernel - Re: [PATCH v4 3/8] powerpc: Fix vDSO clock

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Message-Id: <47Sfqz4ZrXz9sRK@ozlabs.org>
Date:   Thu,  5 Dec 2019 00:30:55 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        arnd@...db.de
Subject: Re: [PATCH v4 3/8] powerpc: Fix vDSO clock_getres()

On Mon, 2019-12-02 at 07:57:29 UTC, Christophe Leroy wrote:
> From: Vincenzo Frascino <vincenzo.frascino@....com>
> 
> clock_getres in the vDSO library has to preserve the same behaviour
> of posix_get_hrtimer_res().
> 
> In particular, posix_get_hrtimer_res() does:
>     sec = 0;
>     ns = hrtimer_resolution;
> and hrtimer_resolution depends on the enablement of the high
> resolution timers that can happen either at compile or at run time.
> 
> Fix the powerpc vdso implementation of clock_getres keeping a copy of
> hrtimer_resolution in vdso data and using that directly.
> 
> Fixes: a7f290dad32e ("[PATCH] powerpc: Merge vdso's and add vdso support
> to 32 bits kernel")
> Cc: stable@...r.kernel.org
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Christophe Leroy <christophe.leroy@....fr>
> Acked-by: Shuah Khan <skhan@...uxfoundation.org>
> [chleroy: changed CLOCK_REALTIME_RES to CLOCK_HRTIMER_RES]
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/552263456215ada7ee8700ce022d12b0cffe4802

cheers