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| author |   Rusty Russell <rusty@rustcorp.com.au> | 2009-06-11 22:59:58 +0930 |
|---|---|---|
| committer |   Dave Jones <davej@redhat.com> | 2009-06-15 11:49:43 -0400 |
| commit | 394122ab144dae4b276d74644a2f11c44a60ac5c (patch) | |
| tree | 849d4f1e03cab2abacc68a25160ef023ee3da879 /arch/x86/kernel/cpu/cpufreq/speedstep-lib.c | |
| parent | [CPUFREQ] powernow-k8: get drv data for correct CPU (diff) | |
| download | linux-dev-394122ab144dae4b276d74644a2f11c44a60ac5c.tar.xz linux-dev-394122ab144dae4b276d74644a2f11c44a60ac5c.zip | |
[CPUFREQ] cpumask: avoid playing with cpus_allowed in speedstep-ich.c
Impact: don't play with current's cpumask
It's generally a very bad idea to mug some process's cpumask: it could
legitimately and reasonably be changed by root, which could break us
(if done before our code) or them (if we restore the wrong value).
We use smp_call_function_single: this had the advantage of being more
efficient, too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
To: cpufreq@vger.kernel.org
Cc: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/speedstep-lib.c')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/speedstep-lib.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c b/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c index 2e3c6862657b..f4c290b8482f 100644 --- a/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c +++ b/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c @@ -226,6 +226,7 @@ static unsigned int pentium4_get_frequency(void) } +/* Warning: may get called from smp_call_function_single. */ unsigned int speedstep_get_frequency(unsigned int processor) { switch (processor) { |