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cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer interrupt #3

Closed liyi-ibm closed 6 years ago

liyi-ibm commented 6 years ago

When testing 4.14.24-2 kernel, there is Hard Lockup reported here:https://github.com/open-power/boston-openpower/issues/1166#issuecomment-385947994. The cause is: https://github.com/open-power/boston-openpower/issues/1180

liyi-ibm commented 6 years ago

To fix, backport patch from linux upstream: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.17-rc3&id=c0f7f5b6c69107ca92909512533e70258ee19188, as commit: https://github.com/liyi-ibm/linux/commit/cfc63d3b369115e2fea3ac9b369b2b56ea1c26de

liyi-ibm commented 6 years ago

Fix by https://github.com/liyi-ibm/linux/commit/cfc63d3b369115e2fea3ac9b369b2b56ea1c26de, tested and close.