linux-kernel - Re: [PATCH 4/6] lib/test_bitmap: switch test_bitmap_parselist to ktime

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Date:   Wed, 20 Feb 2019 15:10:44 -0800 (PST)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     yury.norov@...il.com
CC:     andriy.shevchenko@...ux.intel.com, yury.norov@...il.com,
        akpm@...ux-foundation.org, Arnd Bergmann <arnd@...db.de>,
        dmitry.torokhov@...il.com, keescook@...omium.org,
        willy@...radead.org, mpe@...erman.id.au, linux@...musvillemoes.dk,
        penguin-kernel@...ove.SAKURA.ne.jp, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH 4/6] lib/test_bitmap: switch test_bitmap_parselist to ktime_get()

On Wed, 20 Feb 2019 06:20:48 PST (-0800), yury.norov@...il.com wrote:
> On Wed, Feb 20, 2019 at 03:52:36PM +0200, Andy Shevchenko wrote:
>> On Wed, Feb 20, 2019 at 03:51:01PM +0200, Andy Shevchenko wrote:
>> > On Wed, Feb 20, 2019 at 11:37:03AM +0300, Yury Norov wrote:
>> > > test_bitmap_parselist currently uses get_cycles which is not
>> > > implemented on some platforms, so use ktime_get() instead.
>> >
>> > This sounds like a fix that should go first in the series.
>>
>> Ah, okay, it's already first for test module.
>> Perhaps Fixes tag and actually one or more examples of such architectures?
>
> Hi Andy, thanks for your time on it.
>
> Only arm, arm64, openrisc, riscv and sparc64 #define get_cycles.
> So IIUC, others take stub from include/asm-generic/timex.h.

Should we (RISC-V) be doing something else?  It seems odd to be in such a 
minority here, but we do have a ISA-mandated timer so the get_cycles() 
implementation is super easy.

> sparc32, xtensa, m68k, um, and in some cases x86, mips and nios2
> provide zero-stubs explicitly.
>
> Yury
>
>> --
>> With Best Regards,
>> Andy Shevchenko
>>