linux-kernel - Re: [PATCH v2 04/33] locking/atomic: microblaze: use asm-generic exclusively

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Date:   Mon, 31 May 2021 14:31:04 +0200
From:   Michal Simek <monstr@...str.eu>
To:     Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
        will@...nel.org, boqun.feng@...il.com, peterz@...radead.org
Cc:     aou@...s.berkeley.edu, arnd@...db.de, bcain@...eaurora.org,
        benh@...nel.crashing.org, chris@...kel.net, dalias@...c.org,
        davem@...emloft.net, deanbo422@...il.com, deller@....de,
        geert@...ux-m68k.org, gerg@...ux-m68k.org, green.hu@...il.com,
        guoren@...nel.org, ink@...assic.park.msu.ru,
        James.Bottomley@...senPartnership.com, jcmvbkbc@...il.com,
        jonas@...thpole.se, ley.foon.tan@...el.com, linux@...linux.org.uk,
        mattst88@...il.com, mpe@...erman.id.au, nickhu@...estech.com,
        palmerdabbelt@...gle.com, paulus@...ba.org,
        paul.walmsley@...ive.com, rth@...ddle.net, shorne@...il.com,
        stefan.kristiansson@...nalahti.fi, tsbogend@...ha.franken.de,
        vgupta@...opsys.com, ysato@...rs.sourceforge.jp
Subject: Re: [PATCH v2 04/33] locking/atomic: microblaze: use asm-generic
 exclusively



On 5/25/21 4:02 PM, Mark Rutland wrote:
> Microblaze provides its own implementation of atomic_dec_if_positive(),
> but nothing else. For a while now, the conditional inc/dec ops have been
> optional, and the core code will provide generic implementations using
> the code templates in scripts/atomic/fallbacks/.
> 
> For simplicity, and for consistency with the other conditional atomic
> ops, let's drop the microblaze implementation of
> atomic_dec_if_positive(), and use the generic implementation.
> 
> With that, we can also drop the local asm/atomic.h and asm/cmpxchg.h
> headers, as asm-generic/atomic.h is mandatory-y, and we can pull in
> asm-generic/cmpxchg.h via generic-y. This matches what nios2 and nds32
> do today.
> 
> There should be no functional change as a result of this patch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Michal Simek <monstr@...str.eu>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will@...nel.org>

It is fine based on current code status. I didn't have a time to push
implementation for SMP which will require different handling.

Acked-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs