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[124.45.193.139]) by smtp.gmail.com with ESMTPSA id y15sm20720606pgi.31.2021.04.06.01.57.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Apr 2021 01:57:01 -0700 (PDT) Date: Tue, 6 Apr 2021 17:56:59 +0900 From: Stafford Horne To: guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, openrisc@lists.librecores.org, sparclinux@vger.kernel.org, Guo Ren , Arnd Bergmann , Jonas Bonn , Stefan Kristiansson Subject: Re: [PATCH v6 6/9] openrisc: qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32 Message-ID: <20210406085659.GF3288043@lianli.shorne-pla.net> References: <1617201040-83905-1-git-send-email-guoren@kernel.org> <1617201040-83905-7-git-send-email-guoren@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1617201040-83905-7-git-send-email-guoren@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-csky@vger.kernel.org On Wed, Mar 31, 2021 at 02:30:37PM +0000, guoren@kernel.org wrote: > From: Guo Ren > > We don't have native hw xchg16 instruction, so let qspinlock > generic code to deal with it. > > Using the full-word atomic xchg instructions implement xchg16 has > the semantic risk for atomic operations. > > This patch cancels the dependency of on qspinlock generic code on > architecture's xchg16. > > Signed-off-by: Guo Ren > Cc: Arnd Bergmann > Cc: Jonas Bonn > Cc: Stefan Kristiansson > Cc: Stafford Horne > Cc: openrisc@lists.librecores.org Acked-by: Stafford Horne > --- > arch/openrisc/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig > index 591acc5990dc..b299e409429f 100644 > --- a/arch/openrisc/Kconfig > +++ b/arch/openrisc/Kconfig > @@ -33,6 +33,7 @@ config OPENRISC > select OR1K_PIC > select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1 > select ARCH_USE_QUEUED_SPINLOCKS > + select ARCH_USE_QUEUED_SPINLOCKS_XCHG32 > select ARCH_USE_QUEUED_RWLOCKS > select OMPIC if SMP > select ARCH_WANT_FRAME_POINTERS > -- > 2.17.1 >