lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

Browse Source 
* git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (29 commits)
  [POWERPC] Fix rheap alignment problem
  [POWERPC] Use check_legacy_ioport() for ISAPnP
  [POWERPC] Avoid NULL pointer in gpio1_interrupt
  [POWERPC] Enable generic rtc hook for the MPC8349 mITX
  [POWERPC] Add powerpc get/set_rtc_time interface to new generic rtc class
  [POWERPC] Create a "wrapper" script and use it in arch/powerpc/boot
  [POWERPC] fix spin lock nesting in hvc_iseries
  [POWERPC] EEH failure to mark pci slot as frozen.
  [POWERPC] update powerpc defconfig files after libata kconfig breakage
  [POWERPC] enable sysrq in pmac32_defconfig
  [POWERPC] UPIO_TSI cleanup
  [POWERPC] rewrite mkprep and mkbugboot in sane C
  [POWERPC] maple/pci iomem annotations
  [POWERPC] powerpc oprofile __user annotations
  [POWERPC] cell spufs iomem annotations
  [POWERPC] NULL noise removal: spufs
  [POWERPC] ppc math-emu needs -fno-builtin-fabs for math.c and fabs.c
  [POWERPC] update mpc8349_itx_defconfig and remove some debug settings
  [POWERPC] Always call cede in pseries dedicated idle loop
  [POWERPC] Fix loop logic in irq_alloc_virt()
  ...
This commit is contained in:
Linus Torvalds
2006-10-03 08:52:26 -07:00
parent b4a9071af6 5e98082358
commit ccaa36f735
61 changed files with 3368 additions and 722 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
arch/powerpc/platforms/pseries/setup.c
View File

@@ -477,7 +477,6 @@ static void pseries_dedicated_idle_sleep(void)
{
unsigned int cpu = smp_processor_id();
unsigned long start_snooze;
unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
/*
* Indicate to the HV that we are idle. Now would be
@@ -490,9 +489,9 @@ static void pseries_dedicated_idle_sleep(void)
* has been checked recently. If we should poll for a little
* while, do so.
*/
if (*smt_snooze_delay) {
if (__get_cpu_var(smt_snooze_delay)) {
start_snooze = get_tb() +
*smt_snooze_delay * tb_ticks_per_usec;
__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
@@ -512,24 +511,7 @@ static void pseries_dedicated_idle_sleep(void)
goto out;
}
/*
* If not SMT, cede processor. If CPU is running SMT
* cede if the other thread is not idle, so that it can
* go single-threaded. If the other thread is idle,
* we ask the hypervisor if it has pending work it
* wants to do and cede if it does. Otherwise we keep
* polling in order to reduce interrupt latency.
*
* Doing the cede when the other thread is active will
* result in this thread going dormant, meaning the other
* thread gets to run in single-threaded (ST) mode, which
* is slightly faster than SMT mode with this thread at
* very low priority. The cede enables interrupts, which
* doesn't matter here.
*/
if (!cpu_has_feature(CPU_FTR_SMT) || !lppaca[cpu ^ 1].idle
|| poll_pending() == H_PENDING)
cede_processor();
cede_processor();
out:
HMT_medium();