From: Chen, Kenneth W Date: Wed, 7 Sep 2005 08:00:37 +0000 (-0700) Subject: [IA64] minor performance tune-up in ia64_switch_to X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=02326223247c773bc007629d54622d750c0371c1;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [IA64] minor performance tune-up in ia64_switch_to The reenabling of psr.ic should really belong to dtr mapping code block. It make the fall through code fast since it doesn't need to execute the predicated-off instruction. Logically make more sense as well since psr.ic was turned off in .map code block. Signed-off-by: Ken Chen Signed-off-by: Tony Luck --- diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S index 9be53e1ea404..3c8821024509 100644 --- a/arch/ia64/kernel/entry.S +++ b/arch/ia64/kernel/entry.S @@ -204,9 +204,6 @@ GLOBAL_ENTRY(ia64_switch_to) (p6) br.cond.dpnt .map ;; .done: -(p6) ssm psr.ic // if we had to map, reenable the psr.ic bit FIRST!!! - ;; -(p6) srlz.d ld8 sp=[r21] // load kernel stack pointer of new task mov IA64_KR(CURRENT)=in0 // update "current" application register mov r8=r13 // return pointer to previously running task @@ -234,6 +231,9 @@ GLOBAL_ENTRY(ia64_switch_to) mov IA64_KR(CURRENT_STACK)=r26 // remember last page we mapped... ;; itr.d dtr[r25]=r23 // wire in new mapping... + ssm psr.ic // reenable the psr.ic bit + ;; + srlz.d br.cond.sptk .done END(ia64_switch_to)