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[203.221.156.192]) by smtp.gmail.com with ESMTPSA id y16sm12102240pgg.20.2021.01.30.05.09.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 Jan 2021 05:09:40 -0800 (PST) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v7 10/42] powerpc/32: transfer can avoid saving r4/r5 over trace call Date: Sat, 30 Jan 2021 23:08:20 +1000 Message-Id: <20210130130852.2952424-11-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210130130852.2952424-1-npiggin@gmail.com> References: <20210130130852.2952424-1-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: Athira Rajeev , Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Now that handlers get all registers from pt_regs, r4 and r5 are no longer live here and may be clobbered. Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/entry_32.S | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 238eacfda7b0..d6ea3f2d6cc0 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -276,8 +276,7 @@ reenable_mmu: * We save a bunch of GPRs, * r3 can be different from GPR3(r1) at this point, r9 and r11 * contains the old MSR and handler address respectively, - * r4 & r5 can contain page fault arguments that need to be passed - * along as well. r0, r6-r8, r12, CCR, CTR, XER etc... are left + * r0, r4-r8, r12, CCR, CTR, XER etc... are left * clobbered as they aren't useful past this point. */ @@ -285,15 +284,11 @@ reenable_mmu: stw r9,8(r1) stw r11,12(r1) stw r3,16(r1) - stw r4,20(r1) - stw r5,24(r1) /* If we are disabling interrupts (normal case), simply log it with * lockdep */ 1: bl trace_hardirqs_off - lwz r5,24(r1) - lwz r4,20(r1) lwz r3,16(r1) lwz r11,12(r1) lwz r9,8(r1) -- 2.23.0