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 1/4] powerpc: Optimize register usage for esr register
Date: Sat, 7 Aug 2021 08:56:52 +0200 [thread overview]
Message-ID: <127de0c7-5e30-6797-1e72-6414d4a60119@csgroup.eu> (raw)
In-Reply-To: <20210807010239.416055-2-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 dsisr and esr regsiters, we can reference
> esr to get the exception detail when CONFIG_4xx=y or CONFIG_BOOKE=y.
> Otherwise, reference dsisr. 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 ++
> arch/powerpc/kernel/traps.c | 2 +-
> arch/powerpc/platforms/44x/machine_check.c | 4 ++--
> arch/powerpc/platforms/4xx/machine_check.c | 2 +-
> 6 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
> index 3e5d470a6155..c252d04b1206 100644
> --- a/arch/powerpc/include/asm/ptrace.h
> +++ b/arch/powerpc/include/asm/ptrace.h
> @@ -44,7 +44,10 @@ struct pt_regs
> #endif
> unsigned long trap;
> unsigned long dar;
> - unsigned long dsisr;
> + union {
> + unsigned long dsisr;
> + unsigned long esr;
> + };
> unsigned long result;
> };
> };
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index 185beb290580..f74af8f9133c 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->dsisr);
> + pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, 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 0a0a33eb0d28..a222fd4d6334 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace.c
> @@ -375,6 +375,8 @@ void __init pt_regs_check(void)
> offsetof(struct user_pt_regs, dar));
> BUILD_BUG_ON(offsetof(struct pt_regs, dsisr) !=
> offsetof(struct user_pt_regs, dsisr));
> + BUILD_BUG_ON(offsetof(struct pt_regs, esr) !=
> + offsetof(struct user_pt_regs, dsisr));
esr and dsisr are the same, so checking the same thing a second time is pointless.
> BUILD_BUG_ON(offsetof(struct pt_regs, result) !=
> offsetof(struct user_pt_regs, result));
>
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index dfbce527c98e..2164f5705a0b 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -562,7 +562,7 @@ static inline int check_io_access(struct pt_regs *regs)
> #ifdef CONFIG_PPC_ADV_DEBUG_REGS
> /* On 4xx, the reason for the machine check or program exception
> is in the ESR. */
> -#define get_reason(regs) ((regs)->dsisr)
> +#define get_reason(regs) ((regs)->esr)
> #define REASON_FP ESR_FP
> #define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
> #define REASON_PRIVILEGED ESR_PPR
> diff --git a/arch/powerpc/platforms/44x/machine_check.c b/arch/powerpc/platforms/44x/machine_check.c
> index a5c898bb9bab..5d19daacd78a 100644
> --- a/arch/powerpc/platforms/44x/machine_check.c
> +++ b/arch/powerpc/platforms/44x/machine_check.c
> @@ -11,7 +11,7 @@
>
> int machine_check_440A(struct pt_regs *regs)
> {
> - unsigned long reason = regs->dsisr;
> + unsigned long reason = regs->esr;
>
> printk("Machine check in kernel mode.\n");
> if (reason & ESR_IMCP){
> @@ -48,7 +48,7 @@ int machine_check_440A(struct pt_regs *regs)
> #ifdef CONFIG_PPC_47x
> int machine_check_47x(struct pt_regs *regs)
> {
> - unsigned long reason = regs->dsisr;
> + unsigned long reason = regs->esr;
> u32 mcsr;
>
> printk(KERN_ERR "Machine check in kernel mode.\n");
> diff --git a/arch/powerpc/platforms/4xx/machine_check.c b/arch/powerpc/platforms/4xx/machine_check.c
> index a71c29892a91..a905da1d6f41 100644
> --- a/arch/powerpc/platforms/4xx/machine_check.c
> +++ b/arch/powerpc/platforms/4xx/machine_check.c
> @@ -10,7 +10,7 @@
>
> int machine_check_4xx(struct pt_regs *regs)
> {
> - unsigned long reason = regs->dsisr;
> + unsigned long reason = regs->esr;
>
> if (reason & ESR_IMCP) {
> printk("Instruction");
>
next prev parent reply other threads:[~2021-08-07 7:02 UTC|newest]
Thread overview: 10+ 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 ` [PATCH v2 1/4] powerpc: Optimize register usage for esr register sxwjean
2021-08-07 6:56 ` Christophe Leroy [this message]
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 ` [PATCH v2 3/4] powerpc: Optimize register usage for dear register sxwjean
2021-08-07 6:57 ` Christophe Leroy
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
2021-08-27 13:16 ` [PATCH v2 0/4] Some improvements on regs usage Michael Ellerman
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