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| author | Chen, Kenneth W <kenneth.w.chen@intel.com> | 2005-09-07 01:00:37 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-09-07 13:56:23 -0700 |
| commit | 02326223247c773bc007629d54622d750c0371c1 (patch) | |
| tree | debb5e8b570310f150cfd5e6504c814b584d159f /arch | |
| parent | 295bd89279aad6959f0d363ee8e946d4766f9ad8 (diff) | |
| download | linux-stable-02326223247c773bc007629d54622d750c0371c1.tar.gz linux-stable-02326223247c773bc007629d54622d750c0371c1.tar.bz2 linux-stable-02326223247c773bc007629d54622d750c0371c1.zip | |
[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 <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/kernel/entry.S | 6 |
1 files changed, 3 insertions, 3 deletions
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) |