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[110.174.173.27]) by smtp.gmail.com with ESMTPSA id n14sm5774398wro.81.2020.07.15.17.56.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2020 17:56:23 -0700 (PDT) Date: Thu, 16 Jul 2020 10:56:15 +1000 From: Nicholas Piggin Subject: Re: [PATCH v2] powerpc: select ARCH_HAS_MEMBARRIER_SYNC_CORE To: Andreas Schwab References: <20200715094829.252208-1-npiggin@gmail.com> <87zh816qgv.fsf@igel.home> In-Reply-To: <87zh816qgv.fsf@igel.home> MIME-Version: 1.0 Message-Id: <1594860957.3hoocg9gu6.astroid@bobo.none> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Mathieu Desnoyers , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Excerpts from Andreas Schwab's message of July 15, 2020 8:08 pm: > On Jul 15 2020, Nicholas Piggin wrote: >=20 >> diff --git a/arch/powerpc/include/asm/exception-64e.h b/arch/powerpc/inc= lude/asm/exception-64e.h >> index 54a98ef7d7fe..071d7ccb830f 100644 >> --- a/arch/powerpc/include/asm/exception-64e.h >> +++ b/arch/powerpc/include/asm/exception-64e.h >> @@ -204,7 +204,11 @@ exc_##label##_book3e: >> LOAD_REG_ADDR(r3,interrupt_base_book3e);\ >> ori r3,r3,vector_offset@l; \ >> mtspr SPRN_IVOR##vector_number,r3; >> - >> +/* >> + * powerpc relies on return from interrupt/syscall being context synchr= onising >> + * (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without addi= tional >> + * additional synchronisation instructions. >=20 > s/additonal// Will fix in a respin. Thanks, Nick