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Thu, 27 Jun 2019 22:33:50 -0700 (PDT) Received: from bobo.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id 125sm1272614pfg.23.2019.06.27.22.33.48 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 27 Jun 2019 22:33:49 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 13/13] powerpc/tm: update comment about interrupt re-entrancy Date: Fri, 28 Jun 2019 15:33:32 +1000 Message-Id: <20190628053332.22366-14-npiggin@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190628053332.22366-1-npiggin@gmail.com> References: <20190628053332.22366-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Since the system reset interrupt began to use its own stack, and machine check interrupts have done so for some time, r1 can be changed without clearing MSR[RI], provided no other interrupts (including SLB misses) are taken. MSR[RI] does have to be cleared when using SCRATCH0, however. Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/tm.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S index 9fabdce255cd..6ba0fdd1e7f8 100644 --- a/arch/powerpc/kernel/tm.S +++ b/arch/powerpc/kernel/tm.S @@ -148,7 +148,7 @@ _GLOBAL(tm_reclaim) /* Stash the stack pointer away for use after reclaim */ std r1, PACAR1(r13) - /* Clear MSR RI since we are about to change r1, EE is already off. */ + /* Clear MSR RI since we are about to use SCRATCH0, EE is already off */ li r5, 0 mtmsrd r5, 1 @@ -474,7 +474,7 @@ restore_gprs: REST_GPR(7, r7) - /* Clear MSR RI since we are about to change r1. EE is already off */ + /* Clear MSR RI since we are about to use SCRATCH0. EE is already off */ li r5, 0 mtmsrd r5, 1 -- 2.20.1