linux-kernel - Re: [PATCH v6 17/19] mips: Add support for generic vDSO

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Message-ID: <200c39f5-3bff-cacb-57c9-e11c57df70f5@android.com>
Date:   Mon, 3 Jun 2019 07:54:24 -0700
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mips@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Collingbourne <pcc@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Huw Davies <huw@...eweavers.com>
Subject: Re: [PATCH v6 17/19] mips: Add support for generic vDSO

On 05/31/2019 01:34 AM, Arnd Bergmann wrote:
> On Thu, May 30, 2019 at 4:16 PM Vincenzo Frascino
> <vincenzo.frascino@....com> wrote:
>
>> --- a/arch/mips/vdso/vdso.lds.S
>> +++ b/arch/mips/vdso/vdso.lds.S
>> @@ -99,6 +99,10 @@ VERSION
>>          global:
>>                  __vdso_clock_gettime;
>>                  __vdso_gettimeofday;
>> +               __vdso_clock_getres;
>> +#if _MIPS_SIM != _MIPS_SIM_ABI64
>> +               __vdso_clock_gettime64;
>> +#endif
>>   #endif
>>          local: *;
>>          };
> Same comment as for the corresponding arm change: I'd leave the ABI
> changes to a separate patch, and probably not add __vdso_clock_getres
> at all.

Removing this would break ABI (would it really, it just replaces the 
syscall ... so it is more of a user space expectation)? already present 
in arm64 before this series.

-- Mark