| Message ID | 1313504053-27873-2-git-send-email-dave.martin@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 16 Aug 2011, Dave Martin wrote: > The CPU architecture really should not be changing at runtime, so > make it a global variable instead of a function. > > The cpu_architecture() function in <asm/system.h> remains the > correct way to read this variable from C code. > > Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> > --- > arch/arm/include/asm/system.h | 11 ++++++++++- > arch/arm/kernel/setup.c | 5 ++++- > 2 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h > index 832888d..b0445f7 100644 > --- a/arch/arm/include/asm/system.h > +++ b/arch/arm/include/asm/system.h > @@ -57,6 +57,8 @@ > > #ifndef __ASSEMBLY__ > > +#include <linux/bug.h> > +#include <linux/compiler.h> > #include <linux/linkage.h> > #include <linux/irqflags.h> > > @@ -104,7 +106,14 @@ struct mm_struct; > extern void show_pte(struct mm_struct *mm, unsigned long addr); > extern void __show_regs(struct pt_regs *); > > -extern int cpu_architecture(void); > +extern int __cpu_architecture; > + > +static inline int __pure cpu_architecture(void) > +{ > + BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); > + return __cpu_architecture; > +} > + > extern void cpu_init(void); > > void arm_machine_restart(char mode, const char *cmd); > diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c > index 70bca64..1e0c1b3 100644 > --- a/arch/arm/kernel/setup.c > +++ b/arch/arm/kernel/setup.c > @@ -42,6 +42,7 @@ > #include <asm/cacheflush.h> > #include <asm/cachetype.h> > #include <asm/tlbflush.h> > +#include <asm/system.h> > > #include <asm/prom.h> > #include <asm/mach/arch.h> > @@ -114,6 +115,7 @@ struct cpu_cache_fns cpu_cache __read_mostly; > struct outer_cache_fns outer_cache __read_mostly; > EXPORT_SYMBOL(outer_cache); > #endif > +int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; > > struct stack { > u32 irq[3]; > @@ -210,7 +212,7 @@ static const char *proc_arch[] = { > "?(17)", > }; > > -int cpu_architecture(void) > +static int __init __get_cpu_architecture(void) > { > int cpu_arch; > > @@ -413,6 +415,7 @@ static void __init setup_processor(void) > } > > cpu_name = list->cpu_name; > + __cpu_architecture = __get_cpu_architecture(); > > #ifdef MULTI_CPU > processor = *list->proc; > -- > 1.7.4.1 >
On Tue, Aug 16, 2011 at 12:15:59PM -0400, Nicolas Pitre wrote: > On Tue, 16 Aug 2011, Dave Martin wrote: > > > The CPU architecture really should not be changing at runtime, so > > make it a global variable instead of a function. > > > > The cpu_architecture() function in <asm/system.h> remains the > > correct way to read this variable from C code. > > > > Signed-off-by: Dave Martin <dave.martin@linaro.org> > > Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Thanks ---Dave > > > --- > > arch/arm/include/asm/system.h | 11 ++++++++++- > > arch/arm/kernel/setup.c | 5 ++++- > > 2 files changed, 14 insertions(+), 2 deletions(-) > > > > diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h > > index 832888d..b0445f7 100644 > > --- a/arch/arm/include/asm/system.h > > +++ b/arch/arm/include/asm/system.h > > @@ -57,6 +57,8 @@ > > > > #ifndef __ASSEMBLY__ > > > > +#include <linux/bug.h> > > +#include <linux/compiler.h> > > #include <linux/linkage.h> > > #include <linux/irqflags.h> > > > > @@ -104,7 +106,14 @@ struct mm_struct; > > extern void show_pte(struct mm_struct *mm, unsigned long addr); > > extern void __show_regs(struct pt_regs *); > > > > -extern int cpu_architecture(void); > > +extern int __cpu_architecture; > > + > > +static inline int __pure cpu_architecture(void) > > +{ > > + BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); > > + return __cpu_architecture; > > +} > > + > > extern void cpu_init(void); > > > > void arm_machine_restart(char mode, const char *cmd); > > diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c > > index 70bca64..1e0c1b3 100644 > > --- a/arch/arm/kernel/setup.c > > +++ b/arch/arm/kernel/setup.c > > @@ -42,6 +42,7 @@ > > #include <asm/cacheflush.h> > > #include <asm/cachetype.h> > > #include <asm/tlbflush.h> > > +#include <asm/system.h> > > > > #include <asm/prom.h> > > #include <asm/mach/arch.h> > > @@ -114,6 +115,7 @@ struct cpu_cache_fns cpu_cache __read_mostly; > > struct outer_cache_fns outer_cache __read_mostly; > > EXPORT_SYMBOL(outer_cache); > > #endif > > +int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; > > > > struct stack { > > u32 irq[3]; > > @@ -210,7 +212,7 @@ static const char *proc_arch[] = { > > "?(17)", > > }; > > > > -int cpu_architecture(void) > > +static int __init __get_cpu_architecture(void) > > { > > int cpu_arch; > > > > @@ -413,6 +415,7 @@ static void __init setup_processor(void) > > } > > > > cpu_name = list->cpu_name; > > + __cpu_architecture = __get_cpu_architecture(); > > > > #ifdef MULTI_CPU > > processor = *list->proc; > > -- > > 1.7.4.1 > >
Hello. On 16-08-2011 18:14, Dave Martin wrote: > The CPU architecture really should not be changing at runtime, so > make it a global variable instead of a function. > The cpu_architecture() function in<asm/system.h> remains the > correct way to read this variable from C code. > Signed-off-by: Dave Martin<dave.martin@linaro.org> You're talking of the CPU architecture here but the subject has "cpu_alignment"... WBR, Sergei
On Wed, Aug 17, 2011 at 03:31:21PM +0400, Sergei Shtylyov wrote: > Hello. > > On 16-08-2011 18:14, Dave Martin wrote: > > >The CPU architecture really should not be changing at runtime, so > >make it a global variable instead of a function. > > >The cpu_architecture() function in<asm/system.h> remains the > >correct way to read this variable from C code. > > >Signed-off-by: Dave Martin<dave.martin@linaro.org> > > You're talking of the CPU architecture here but the subject has > "cpu_alignment"... Hmmm, I guess my brain was on autopilot when I wrote that... You're right, it should say cpu_architecture in the subject. I'll fix this before I repost. Thanks ---Dave
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 832888d..b0445f7 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -57,6 +57,8 @@ #ifndef __ASSEMBLY__ +#include <linux/bug.h> +#include <linux/compiler.h> #include <linux/linkage.h> #include <linux/irqflags.h> @@ -104,7 +106,14 @@ struct mm_struct; extern void show_pte(struct mm_struct *mm, unsigned long addr); extern void __show_regs(struct pt_regs *); -extern int cpu_architecture(void); +extern int __cpu_architecture; + +static inline int __pure cpu_architecture(void) +{ + BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); + return __cpu_architecture; +} + extern void cpu_init(void); void arm_machine_restart(char mode, const char *cmd); diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 70bca64..1e0c1b3 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -42,6 +42,7 @@ #include <asm/cacheflush.h> #include <asm/cachetype.h> #include <asm/tlbflush.h> +#include <asm/system.h> #include <asm/prom.h> #include <asm/mach/arch.h> @@ -114,6 +115,7 @@ struct cpu_cache_fns cpu_cache __read_mostly; struct outer_cache_fns outer_cache __read_mostly; EXPORT_SYMBOL(outer_cache); #endif +int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; struct stack { u32 irq[3]; @@ -210,7 +212,7 @@ static const char *proc_arch[] = { "?(17)", }; -int cpu_architecture(void) +static int __init __get_cpu_architecture(void) { int cpu_arch; @@ -413,6 +415,7 @@ static void __init setup_processor(void) } cpu_name = list->cpu_name; + __cpu_architecture = __get_cpu_architecture(); #ifdef MULTI_CPU processor = *list->proc;
The CPU architecture really should not be changing at runtime, so make it a global variable instead of a function. The cpu_architecture() function in <asm/system.h> remains the correct way to read this variable from C code. Signed-off-by: Dave Martin <dave.martin@linaro.org> --- arch/arm/include/asm/system.h | 11 ++++++++++- arch/arm/kernel/setup.c | 5 ++++- 2 files changed, 14 insertions(+), 2 deletions(-)