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authorThomas Gleixner <[email protected]>2017-04-12 22:07:37 +0200
committerThomas Gleixner <[email protected]>2017-04-15 12:20:55 +0200
commit9fe24c4e92d3963d92d7d383e28ed098bd5689d8 (patch)
tree1f331b3ee3445cb7d3946a38b8ee8c57a0dc626e /net
parent205dcc1ecbc566cbc20acf246e68de3b080b3ecf (diff)
cpufreq/sparc-us3: Replace racy task affinity logic
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]> Acked-by: Viresh Kumar <[email protected]> Cc: Fenghua Yu <[email protected]> Cc: Tony Luck <[email protected]> Cc: Herbert Xu <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Sebastian Siewior <[email protected]> Cc: [email protected] Cc: Lai Jiangshan <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Tejun Heo <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Len Brown <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]>
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