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[60.241.117.97]) by smtp.gmail.com with ESMTPSA id o65sm5941422pfg.187.2020.04.03.06.26.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Apr 2020 06:26:49 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 03/14] powerpc/64s/exceptions: Change irq reconcile for NMIs from reusing _DAR to RESULT Date: Fri, 3 Apr 2020 23:26:11 +1000 Message-Id: <20200403132622.130394-4-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200403132622.130394-1-npiggin@gmail.com> References: <20200403132622.130394-1-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: Mahesh Salgaonkar , Ganesh Goudar , Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" A spare interrupt stack slot is needed to save irq state when reconciling NMIs (sreset and decrementer soft-nmi). _DAR is used for this, but we want to reconcile machine checks as well, which do use _DAR. Switch to using RESULT instead, as it's used by system calls. Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/exceptions-64s.S | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 3322000316ab..a42b73efb1a9 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -939,13 +939,13 @@ EXC_COMMON_BEGIN(system_reset_common) * the right thing. We do not want to reconcile because that goes * through irq tracing which we don't want in NMI. * - * Save PACAIRQHAPPENED to _DAR (otherwise unused), and set HARD_DIS + * Save PACAIRQHAPPENED to RESULT (otherwise unused), and set HARD_DIS * as we are running with MSR[EE]=0. */ li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) lbz r10,PACAIRQHAPPENED(r13) - std r10,_DAR(r1) + std r10,RESULT(r1) ori r10,r10,PACA_IRQ_HARD_DIS stb r10,PACAIRQHAPPENED(r13) @@ -966,7 +966,7 @@ EXC_COMMON_BEGIN(system_reset_common) /* * Restore soft mask settings. */ - ld r10,_DAR(r1) + ld r10,RESULT(r1) stb r10,PACAIRQHAPPENED(r13) ld r10,SOFTE(r1) stb r10,PACAIRQSOFTMASK(r13) @@ -2743,7 +2743,7 @@ EXC_COMMON_BEGIN(soft_nmi_common) li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) lbz r10,PACAIRQHAPPENED(r13) - std r10,_DAR(r1) + std r10,RESULT(r1) ori r10,r10,PACA_IRQ_HARD_DIS stb r10,PACAIRQHAPPENED(r13) @@ -2757,7 +2757,7 @@ EXC_COMMON_BEGIN(soft_nmi_common) /* * Restore soft mask settings. */ - ld r10,_DAR(r1) + ld r10,RESULT(r1) stb r10,PACAIRQHAPPENED(r13) ld r10,SOFTE(r1) stb r10,PACAIRQSOFTMASK(r13) -- 2.23.0