linux-kernel - Re: [patch 2/5] lib/vdso: Move fallback invocation to the callers

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Message-ID: <CALCETrWvxV9NnmFpdNiAHqf4Anz-Q4wdF0hTXwFg9q3g7cEKhw@mail.gmail.com>
Date:   Sun, 28 Jul 2019 07:37:18 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Bolle <pebolle@...cali.nl>, Will Deacon <will@...nel.org>
Subject: Re: [patch 2/5] lib/vdso: Move fallback invocation to the callers

On Sun, Jul 28, 2019 at 6:20 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> To allow syscall fallbacks using the legacy 32bit syscall for 32bit VDSO
> builds, move the fallback invocation out into the callers.
>
> Split the common code out of __cvdso_clock_gettime/getres() and invoke the
> syscall fallback in the 64bit and 32bit variants.
>
> Preparatory work for using legacy syscalls in 32bit VDSO. No functional
> change.

Reviewed-by: Andy Lutomirski <luto@...nel.org>