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[203.221.156.192]) by smtp.gmail.com with ESMTPSA id 77sm13765743pfz.100.2021.01.26.02.18.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Jan 2021 02:18:47 -0800 (PST) Date: Tue, 26 Jan 2021 20:18:42 +1000 From: Nicholas Piggin Subject: Re: [PATCH v4 14/23] powerpc/syscall: Save r3 in regs->orig_r3 To: Benjamin Herrenschmidt , Christophe Leroy , Michael Ellerman , msuchanek@suse.de, Paul Mackerras Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org References: <5d375bea8f519924e110842f6b0d05e83cd04470.1611585031.git.christophe.leroy@csgroup.eu> In-Reply-To: <5d375bea8f519924e110842f6b0d05e83cd04470.1611585031.git.christophe.leroy@csgroup.eu> MIME-Version: 1.0 Message-Id: <1611656262.d3l09kg9o2.astroid@bobo.none> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Excerpts from Christophe Leroy's message of January 26, 2021 12:48 am: > Save r3 in regs->orig_r3 in system_call_exception() >=20 > Signed-off-by: Christophe Leroy > --- > arch/powerpc/kernel/entry_64.S | 1 - > arch/powerpc/kernel/syscall.c | 2 ++ > 2 files changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_6= 4.S > index aa1af139d947..a562a4240aa6 100644 > --- a/arch/powerpc/kernel/entry_64.S > +++ b/arch/powerpc/kernel/entry_64.S > @@ -278,7 +278,6 @@ END_BTB_FLUSH_SECTION > std r10,_LINK(r1) > std r11,_TRAP(r1) > std r12,_CCR(r1) > - std r3,ORIG_GPR3(r1) > addi r10,r1,STACK_FRAME_OVERHEAD > ld r11,exception_marker@toc(r2) > std r11,-16(r10) /* "regshere" marker */ This misses system_call_vectored. Thanks, Nick > diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.= c > index cb415170b8f2..b66cfcbcb755 100644 > --- a/arch/powerpc/kernel/syscall.c > +++ b/arch/powerpc/kernel/syscall.c > @@ -29,6 +29,8 @@ notrace long system_call_exception(long r3, long r4, lo= ng r5, > { > syscall_fn f; > =20 > + regs->orig_gpr3 =3D r3; > + > if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) > BUG_ON(irq_soft_mask_return() !=3D IRQS_ALL_DISABLED); > =20 > --=20 > 2.25.0 >=20 >=20