__local_irq_save() and local_save_flags() are used to mask interruptions. They read all psr bits that requres whole bit emulation. On the other hand, reading only psr.i, the single bit, can be virtualized cheaply.

Signed-off-by: Isaku Yamahata <yama...@valinux.co.jp> --- include/asm-ia64/intrinsics.h | 2 ++ include/asm-ia64/system.h | 10 ++++++++-- 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/asm-ia64/intrinsics.h b/include/asm-ia64/intrinsics.h index 9b83f8f..a3b9689 100644 --- a/include/asm-ia64/intrinsics.h +++ b/include/asm-ia64/intrinsics.h @@ -18,6 +18,8 @@ # include <asm/gcc_intrin.h> #endif

+#define ia64_get_psr_i() (ia64_getreg(_IA64_REG_PSR) & IA64_PSR_I) + #define ia64_set_rr0_to_rr4(val0, val1, val2, val3, val4) \ do { \ ia64_set_rr(0x0000000000000000UL, (val0)); \ diff --git a/include/asm-ia64/system.h b/include/asm-ia64/system.h index 26e250b..ed38c43 100644 --- a/include/asm-ia64/system.h +++ b/include/asm-ia64/system.h @@ -122,10 +122,16 @@ extern struct ia64_boot_param { * write a floating-point register right before reading the PSR * and that writes to PSR.mfl */ +#ifdef CONFIG_PARAVIRT +#define __local_save_flags() ia64_get_psr_i() +#else +#define __local_save_flags() ia64_getreg(_IA64_REG_PSR) +#endif + #define __local_irq_save(x) \ do { \ ia64_stop(); \ - (x) = ia64_getreg(_IA64_REG_PSR); \ + (x) = __local_save_flags(); \ ia64_stop(); \ ia64_rsm(IA64_PSR_I); \ } while (0) @@ -173,7 +179,7 @@ do { \ #endif /* !CONFIG_IA64_DEBUG_IRQ */

#define local_irq_enable() ({ ia64_stop(); ia64_ssm(IA64_PSR_I); ia64_srlz_d();
}) -#define local_save_flags(flags) ({ ia64_stop(); (flags) =
ia64_getreg(_IA64_REG_PSR); }) +#define local_save_flags(flags) ({ ia64_stop(); (flags) = __local_save_flags();
})

#define irqs_disabled() \ ({ \ -- 1.5.3