On 12-04-17, 22:07, Thomas Gleixner wrote: > The access to the safari config register in the CPU frequency functions > must be executed on the target CPU. This is achieved by temporarily setting > the affinity of the calling user space thread to the requested CPU and > reset it to the original affinity afterwards. > > That's racy vs. CPU hotplug and concurrent affinity settings for that > thread resulting in code executing on the wrong CPU and overwriting the > new affinity setting. > > Replace it by a straight forward smp function call. > > Signed-off-by: Thomas Gleixner <[email protected]> > Cc: "Rafael J. Wysocki" <[email protected]> > Cc: Viresh Kumar <[email protected]> > Cc: "David S. Miller" <[email protected]> > Cc: [email protected] > --- > drivers/cpufreq/sparc-us3-cpufreq.c | 46 > ++++++++++++------------------------ > 1 file changed, 16 insertions(+), 30 deletions(-)
Acked-by: Viresh Kumar <[email protected]> -- viresh
