linux-kernel - Re: [patch V2 17/17] lib/vdso: Allow architectures to provide the vdso data pointer

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Message-ID: <2940ba48-e53b-d6af-d893-95e5e1d026f4@arm.com>
Date:   Mon, 17 Feb 2020 12:09:26 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, John Stultz <john.stultz@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>, Andrei Vagin <avagin@...il.com>
Subject: Re: [patch V2 17/17] lib/vdso: Allow architectures to provide the
 vdso data pointer

On 07/02/2020 12:39, Thomas Gleixner wrote:
> From: Christophe Leroy <christophe.leroy@....fr>
> 
> On powerpc, __arch_get_vdso_data() clobbers the link register, requiring
> the caller to save it.
> 
> As the parent function already has to set a stack frame and saves the link
> register before calling the C vdso function, retrieving the vdso data
> pointer there is less overhead.
> 
> Split out the functional code from the __cvdso.*() interfaces into new
> static functions which can either be called from the existing interfaces
> with the vdso data pointer supplied via __arch_get_vdso_data() or directly
> from ASM code.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Link: https://lore.kernel.org/r/abf97996602ef07223fec30c005df78e5ed41b2e.1580399657.git.christophe.leroy@c-s.fr
> 
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@....com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@....com>

[...]

-- 
Regards,
Vincenzo

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