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Date: Sat, 02 Apr 2011 02:22:45 -0400 From: Len Brown <lenb@...nel.org> To: linux-pm@...ts.linux-foundation.org Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>, x86@...nel.org, Jiri Kosina <jkosina@...e.cz>, stable@...nel.org Subject: [PATCH 03/18] x86 idle APM: deprecate CONFIG_APM_CPU_IDLE From: Len Brown <len.brown@...el.com> We don't want to export the pm_idle function pointer to modules. Currently CONFIG_APM_CPU_IDLE w/ CONFIG_APM_MODULE forces us to. CONFIG_APM_CPU_IDLE is of dubious value, it runs only on 32-bit uniprocessor laptops that are over 10 years old. It calls into the BIOS during idle, and is known to cause a number of machines to fail. Removing CONFIG_APM_CPU_IDLE and will allow us to stop exporting pm_idle. Any systems that were calling into the APM BIOS at run-time will simply use HLT instead. cc: x86@...nel.org cc: Jiri Kosina <jkosina@...e.cz> cc: stable@...nel.org Signed-off-by: Len Brown <len.brown@...el.com> --- Documentation/feature-removal-schedule.txt | 10 ++++++++++ arch/x86/kernel/apm_32.c | 2 ++ 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index 54db467..bab1acb 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -14,6 +14,16 @@ Who: Len Brown <len.brown@...el.com> --------------------------- +What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle +When: 2.6.40 +Why: This optional sub-feature of APM is of dubious reliability, + and ancient APM laptops are likely better served by calling HLT. + Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting + the pm_idle function pointer to modules. +Who: Len Brown <len.brown@...el.com> + +---------------------------- + What: PRISM54 When: 2.6.34 diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index 0e4f24c..072546c 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -359,6 +359,7 @@ struct apm_user { * idle percentage above which bios idle calls are done */ #ifdef CONFIG_APM_CPU_IDLE +#warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2.6.40 #define DEFAULT_IDLE_THRESHOLD 95 #else #define DEFAULT_IDLE_THRESHOLD 100 @@ -902,6 +903,7 @@ static void apm_cpu_idle(void) unsigned int jiffies_since_last_check = jiffies - last_jiffies; unsigned int bucket; + WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2.6.40"); recalc: if (jiffies_since_last_check > IDLE_CALC_LIMIT) { use_apm_idle = 0; -- 1.7.5.rc0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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