diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-08-19 21:23:48 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-08-21 13:55:49 +0100 |
| commit | 1eef5d2f1b461c120bcd82077edee5ec706ac53b (patch) | |
| tree | b95a7132189a44d9a826e7b44fbbe5cae74d75fb /arch/arm/include/asm/domain.h | |
| parent | d770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff) | |
ARM: domains: switch to keeping domain value in register
Rather than modifying both the domain access control register and our
per-thread copy, modify only the domain access control register, and
use the per-thread copy to save and restore the register over context
switches. We can also avoid the explicit initialisation of the
init thread_info structure.
This allows us to avoid needing to gain access to the thread information
at the uaccess control sites.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/domain.h')
| -rw-r--r-- | arch/arm/include/asm/domain.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/arm/include/asm/domain.h b/arch/arm/include/asm/domain.h index 6ddbe446425e..7f2941905714 100644 --- a/arch/arm/include/asm/domain.h +++ b/arch/arm/include/asm/domain.h @@ -59,6 +59,17 @@ #ifndef __ASSEMBLY__ +static inline unsigned int get_domain(void) +{ + unsigned int domain; + + asm( + "mrc p15, 0, %0, c3, c0 @ get domain" + : "=r" (domain)); + + return domain; +} + #ifdef CONFIG_CPU_USE_DOMAINS static inline void set_domain(unsigned val) { @@ -70,11 +81,10 @@ static inline void set_domain(unsigned val) #define modify_domain(dom,type) \ do { \ - struct thread_info *thread = current_thread_info(); \ - unsigned int domain = thread->cpu_domain; \ - domain &= ~domain_val(dom, DOMAIN_MANAGER); \ - thread->cpu_domain = domain | domain_val(dom, type); \ - set_domain(thread->cpu_domain); \ + unsigned int domain = get_domain(); \ + domain &= ~domain_val(dom, DOMAIN_MANAGER); \ + domain = domain | domain_val(dom, type); \ + set_domain(domain); \ } while (0) #else |