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parisc: Reduce overhead of parisc_requires_coherency() 

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2015-12-12 18:22:03 +01:00
parent 602c9c9a01
commit fc63257503
2 changed files with 17 additions and 10 deletions
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17
arch/parisc/include/asm/processor.h
View File

@ -311,18 +311,17 @@ extern unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
#define cpu_relax_lowlatency() cpu_relax()
/* Used as a macro to identify the combined VIPT/PIPT cached
* CPUs which require a guarantee of coherency (no inequivalent
* aliases with different data, whether clean or not) to operate */
static inline int parisc_requires_coherency(void)
{
/*
* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
* cached CPUs which require a guarantee of coherency (no inequivalent aliases
* with different data, whether clean or not) to operate
*/
#ifdef CONFIG_PA8X00
return (boot_cpu_data.cpu_type == mako) ||
(boot_cpu_data.cpu_type == mako2);
extern int _parisc_requires_coherency;
#define parisc_requires_coherency() _parisc_requires_coherency
#else
return 0;
#define parisc_requires_coherency() (0)
#endif
}
#endif /* __ASSEMBLY__ */

10
arch/parisc/kernel/processor.c
View File

@ -44,6 +44,10 @@
struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);
#ifdef CONFIG_PA8X00
int _parisc_requires_coherency __read_mostly;
EXPORT_SYMBOL(_parisc_requires_coherency);
#endif
DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
@ -277,8 +281,12 @@ void __init collect_boot_cpu_data(void)
boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
}
#ifdef CONFIG_PA8X00
_parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
(boot_cpu_data.cpu_type == mako2);
#endif
}
/**