From: Christophe Leroy <christophe.leroy@csgroup.eu> To: sxwjean@me.com, linuxppc-dev@lists.ozlabs.org Cc: oleg@redhat.com, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, ravi.bangoria@linux.ibm.com, aneesh.kumar@linux.ibm.com, efremov@linux.com, linux-kernel@vger.kernel.org, Xiongwei Song <sxwjean@gmail.com> Subject: Re: [PATCH v2 3/4] powerpc: Optimize register usage for dear register Date: Sat, 7 Aug 2021 08:57:24 +0200 [thread overview] Message-ID: <dfd24c4a-c43f-912c-5876-f1cac704f336@csgroup.eu> (raw) In-Reply-To: <20210807010239.416055-4-sxwjean@me.com> Le 07/08/2021 à 03:02, sxwjean@me.com a écrit : > From: Xiongwei Song <sxwjean@gmail.com> > > Create an anonymous union for dar and dear regsiters, we can reference > dear to get the effective address when CONFIG_4xx=y or CONFIG_BOOKE=y. > Otherwise, reference dar. This makes code more clear. > > Signed-off-by: Xiongwei Song <sxwjean@gmail.com> > --- > arch/powerpc/include/asm/ptrace.h | 5 ++++- > arch/powerpc/kernel/process.c | 2 +- > arch/powerpc/kernel/ptrace/ptrace.c | 2 ++ > 3 files changed, 7 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h > index c252d04b1206..fa725e3238c2 100644 > --- a/arch/powerpc/include/asm/ptrace.h > +++ b/arch/powerpc/include/asm/ptrace.h > @@ -43,7 +43,10 @@ struct pt_regs > unsigned long mq; > #endif > unsigned long trap; > - unsigned long dar; > + union { > + unsigned long dar; > + unsigned long dear; > + }; > union { > unsigned long dsisr; > unsigned long esr; > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c > index f74af8f9133c..50436b52c213 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -1499,7 +1499,7 @@ static void __show_regs(struct pt_regs *regs) > trap == INTERRUPT_DATA_STORAGE || > trap == INTERRUPT_ALIGNMENT) { > if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE)) > - pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->esr); > + pr_cont("DEAR: "REG" ESR: "REG" ", regs->dear, regs->esr); > else > pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr); > } > diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c > index a222fd4d6334..7c7093c17c45 100644 > --- a/arch/powerpc/kernel/ptrace/ptrace.c > +++ b/arch/powerpc/kernel/ptrace/ptrace.c > @@ -373,6 +373,8 @@ void __init pt_regs_check(void) > offsetof(struct user_pt_regs, trap)); > BUILD_BUG_ON(offsetof(struct pt_regs, dar) != > offsetof(struct user_pt_regs, dar)); > + BUILD_BUG_ON(offsetof(struct pt_regs, dear) != > + offsetof(struct user_pt_regs, dar)); dar and dear are the same, so checking the same thing a second time is pointless. > BUILD_BUG_ON(offsetof(struct pt_regs, dsisr) != > offsetof(struct user_pt_regs, dsisr)); > BUILD_BUG_ON(offsetof(struct pt_regs, esr) != >
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu> To: sxwjean@me.com, linuxppc-dev@lists.ozlabs.org Cc: ravi.bangoria@linux.ibm.com, Xiongwei Song <sxwjean@gmail.com>, oleg@redhat.com, npiggin@gmail.com, linux-kernel@vger.kernel.org, efremov@linux.com, paulus@samba.org, aneesh.kumar@linux.ibm.com Subject: Re: [PATCH v2 3/4] powerpc: Optimize register usage for dear register Date: Sat, 7 Aug 2021 08:57:24 +0200 [thread overview] Message-ID: <dfd24c4a-c43f-912c-5876-f1cac704f336@csgroup.eu> (raw) In-Reply-To: <20210807010239.416055-4-sxwjean@me.com> Le 07/08/2021 à 03:02, sxwjean@me.com a écrit : > From: Xiongwei Song <sxwjean@gmail.com> > > Create an anonymous union for dar and dear regsiters, we can reference > dear to get the effective address when CONFIG_4xx=y or CONFIG_BOOKE=y. > Otherwise, reference dar. This makes code more clear. > > Signed-off-by: Xiongwei Song <sxwjean@gmail.com> > --- > arch/powerpc/include/asm/ptrace.h | 5 ++++- > arch/powerpc/kernel/process.c | 2 +- > arch/powerpc/kernel/ptrace/ptrace.c | 2 ++ > 3 files changed, 7 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h > index c252d04b1206..fa725e3238c2 100644 > --- a/arch/powerpc/include/asm/ptrace.h > +++ b/arch/powerpc/include/asm/ptrace.h > @@ -43,7 +43,10 @@ struct pt_regs > unsigned long mq; > #endif > unsigned long trap; > - unsigned long dar; > + union { > + unsigned long dar; > + unsigned long dear; > + }; > union { > unsigned long dsisr; > unsigned long esr; > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c > index f74af8f9133c..50436b52c213 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -1499,7 +1499,7 @@ static void __show_regs(struct pt_regs *regs) > trap == INTERRUPT_DATA_STORAGE || > trap == INTERRUPT_ALIGNMENT) { > if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE)) > - pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->esr); > + pr_cont("DEAR: "REG" ESR: "REG" ", regs->dear, regs->esr); > else > pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr); > } > diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c > index a222fd4d6334..7c7093c17c45 100644 > --- a/arch/powerpc/kernel/ptrace/ptrace.c > +++ b/arch/powerpc/kernel/ptrace/ptrace.c > @@ -373,6 +373,8 @@ void __init pt_regs_check(void) > offsetof(struct user_pt_regs, trap)); > BUILD_BUG_ON(offsetof(struct pt_regs, dar) != > offsetof(struct user_pt_regs, dar)); > + BUILD_BUG_ON(offsetof(struct pt_regs, dear) != > + offsetof(struct user_pt_regs, dar)); dar and dear are the same, so checking the same thing a second time is pointless. > BUILD_BUG_ON(offsetof(struct pt_regs, dsisr) != > offsetof(struct user_pt_regs, dsisr)); > BUILD_BUG_ON(offsetof(struct pt_regs, esr) != >
next prev parent reply other threads:[~2021-08-07 7:02 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-07 1:02 [PATCH v2 0/4] Some improvements on regs usage sxwjean 2021-08-07 1:02 ` sxwjean 2021-08-07 1:02 ` [PATCH v2 1/4] powerpc: Optimize register usage for esr register sxwjean 2021-08-07 1:02 ` sxwjean 2021-08-07 6:56 ` Christophe Leroy 2021-08-07 6:56 ` Christophe Leroy 2021-08-10 8:33 ` Xiongwei Song 2021-08-10 8:33 ` Xiongwei Song 2021-08-07 1:02 ` [PATCH v2 2/4] powerpc/64e: Get esr offset with _ESR macro sxwjean 2021-08-07 1:02 ` sxwjean 2021-08-07 1:02 ` [PATCH v2 3/4] powerpc: Optimize register usage for dear register sxwjean 2021-08-07 1:02 ` sxwjean 2021-08-07 6:57 ` Christophe Leroy [this message] 2021-08-07 6:57 ` Christophe Leroy 2021-08-10 8:33 ` Xiongwei Song 2021-08-10 8:33 ` Xiongwei Song 2021-08-07 1:02 ` [PATCH v2 4/4] powerpc/64e: Get dear offset with _DEAR macro sxwjean 2021-08-07 1:02 ` sxwjean 2021-08-27 13:16 ` [PATCH v2 0/4] Some improvements on regs usage Michael Ellerman 2021-08-27 13:16 ` Michael Ellerman
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=dfd24c4a-c43f-912c-5876-f1cac704f336@csgroup.eu \ --to=christophe.leroy@csgroup.eu \ --cc=aneesh.kumar@linux.ibm.com \ --cc=benh@kernel.crashing.org \ --cc=efremov@linux.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linuxppc-dev@lists.ozlabs.org \ --cc=mpe@ellerman.id.au \ --cc=npiggin@gmail.com \ --cc=oleg@redhat.com \ --cc=paulus@samba.org \ --cc=ravi.bangoria@linux.ibm.com \ --cc=sxwjean@gmail.com \ --cc=sxwjean@me.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.