On 12-04-17, 22:07, Thomas Gleixner wrote: > The get() and target() callbacks must run on the affected cpu. This is > achieved by temporarily setting the affinity of the calling thread to the > requested CPU and reset it to the original affinity afterwards. > > That's racy vs. concurrent affinity settings for that thread resulting in > code executing on the wrong CPU and overwriting the new affinity setting. > > Replace it by work_on_cpu(). All call pathes which invoke the callbacks are > already protected against CPU hotplug. > > Signed-off-by: Thomas Gleixner <[email protected]> > Cc: "Rafael J. Wysocki" <[email protected]> > Cc: Viresh Kumar <[email protected]> > Cc: Tony Luck <[email protected]> > Cc: Fenghua Yu <[email protected]> > Cc: [email protected] > --- > drivers/cpufreq/ia64-acpi-cpufreq.c | 91 > +++++++++++++++--------------------- > 1 file changed, 38 insertions(+), 53 deletions(-)
Acked-by: Viresh Kumar <[email protected]> -- viresh
