From: Guo Ren <guoren@kernel.org> To: Arnd Bergmann <arnd@arndb.de> Cc: Peter Zijlstra <peterz@infradead.org>, linux-riscv <linux-riscv@lists.infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-csky@vger.kernel.org, linux-arch <linux-arch@vger.kernel.org>, Guo Ren <guoren@linux.alibaba.com>, Anup Patel <anup@brainfault.org>, Palmer Dabbelt <palmerdabbelt@google.com> Subject: Re: [PATCH v2 (RESEND) 2/2] riscv: atomic: Using ARCH_ATOMIC in asm/atomic.h Date: Tue, 20 Apr 2021 09:22:33 +0800 [thread overview] Message-ID: <CAJF2gTRkWD6NcfriQhLBYL0eBafNmLx1Kw_Rmaex3851SzVBWQ@mail.gmail.com> (raw) In-Reply-To: <CAK8P3a1ygwS7jTXqYXCfppEEonCASqG_5GM9O_AtE9YgdgNqVQ@mail.gmail.com> On Mon, Apr 19, 2021 at 7:46 PM Arnd Bergmann <arnd@arndb.de> wrote: > > On Sat, Apr 17, 2021 at 6:45 AM <guoren@kernel.org> wrote: > > +#define arch_atomic_read(v) __READ_ONCE((v)->counter) > > +#define arch_atomic_set(v, i) __WRITE_ONCE(((v)->counter), (i)) > > > +#define ATOMIC64_INIT ATOMIC_INIT > > +#define arch_atomic64_read arch_atomic_read > > +#define arch_atomic64_set arch_atomic_set > > #endif > > I think it's a bit confusing to define arch_atomic64_read() etc in terms > of arch_atomic_read(), given that they operate on different types. > > IMHO the clearest would be to define both in terms of the open-coded > version you have for the 32-bit atomics. Okay: +#define arch_atomic64_read __READ_ONCE((v)->counter) +#define arch_atomic64_set __WRITE_ONCE(((v)->counter), (i)) > > Also, given that all three architectures (x86, arm64, riscv) use the same > definitions for the six macros above, maybe those can just get moved > into a common file with a possible override? I'll try it with a separate patch. > > x86 uses an inline function here instead of the macro. This would also > be my preference, but it may add complexity to avoid circular header > dependencies. > > The rest of this patch looks good to me. > > Arnd -- Best Regards Guo Ren ML: https://lore.kernel.org/linux-csky/
WARNING: multiple messages have this Message-ID (diff)
From: Guo Ren <guoren@kernel.org> To: Arnd Bergmann <arnd@arndb.de> Cc: Peter Zijlstra <peterz@infradead.org>, linux-riscv <linux-riscv@lists.infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-csky@vger.kernel.org, linux-arch <linux-arch@vger.kernel.org>, Guo Ren <guoren@linux.alibaba.com>, Anup Patel <anup@brainfault.org>, Palmer Dabbelt <palmerdabbelt@google.com> Subject: Re: [PATCH v2 (RESEND) 2/2] riscv: atomic: Using ARCH_ATOMIC in asm/atomic.h Date: Tue, 20 Apr 2021 09:22:33 +0800 [thread overview] Message-ID: <CAJF2gTRkWD6NcfriQhLBYL0eBafNmLx1Kw_Rmaex3851SzVBWQ@mail.gmail.com> (raw) In-Reply-To: <CAK8P3a1ygwS7jTXqYXCfppEEonCASqG_5GM9O_AtE9YgdgNqVQ@mail.gmail.com> On Mon, Apr 19, 2021 at 7:46 PM Arnd Bergmann <arnd@arndb.de> wrote: > > On Sat, Apr 17, 2021 at 6:45 AM <guoren@kernel.org> wrote: > > +#define arch_atomic_read(v) __READ_ONCE((v)->counter) > > +#define arch_atomic_set(v, i) __WRITE_ONCE(((v)->counter), (i)) > > > +#define ATOMIC64_INIT ATOMIC_INIT > > +#define arch_atomic64_read arch_atomic_read > > +#define arch_atomic64_set arch_atomic_set > > #endif > > I think it's a bit confusing to define arch_atomic64_read() etc in terms > of arch_atomic_read(), given that they operate on different types. > > IMHO the clearest would be to define both in terms of the open-coded > version you have for the 32-bit atomics. Okay: +#define arch_atomic64_read __READ_ONCE((v)->counter) +#define arch_atomic64_set __WRITE_ONCE(((v)->counter), (i)) > > Also, given that all three architectures (x86, arm64, riscv) use the same > definitions for the six macros above, maybe those can just get moved > into a common file with a possible override? I'll try it with a separate patch. > > x86 uses an inline function here instead of the macro. This would also > be my preference, but it may add complexity to avoid circular header > dependencies. > > The rest of this patch looks good to me. > > Arnd -- Best Regards Guo Ren ML: https://lore.kernel.org/linux-csky/ _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2021-04-20 1:22 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-17 4:45 [PATCH v2 (RESEND) 1/2] locking/atomics: Fixup GENERIC_ATOMIC64 conflict with atomic-arch-fallback.h guoren 2021-04-17 4:45 ` guoren 2021-04-17 4:45 ` [PATCH v2 (RESEND) 2/2] riscv: atomic: Using ARCH_ATOMIC in asm/atomic.h guoren 2021-04-17 4:45 ` guoren 2021-04-19 11:45 ` Arnd Bergmann 2021-04-19 11:45 ` Arnd Bergmann 2021-04-20 1:22 ` Guo Ren [this message] 2021-04-20 1:22 ` Guo Ren
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