Hi, Please let us know, is below patch good to have or not for non ssbs systems.
On 8/4/2020 7:44 PM, Gaurav Kohli wrote:
In a system where no cpu's implement SSBS, for them no need to set pstate. This might help to save few cpu cycles during context switch. Signed-off-by: Gaurav Kohli <gko...@codeaurora.org> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 6089638..79f80f1 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -477,6 +477,13 @@ static void ssbs_thread_switch(struct task_struct *next) struct pt_regs *regs = task_pt_regs(next);/*+ * For Targets which don't have SSBS support, they + * can return from here. + */ + if (!IS_ENABLED(CONFIG_ARM64_SSBD)) + return; + + /* * Nothing to do for kernel threads, but 'regs' may be junk * (e.g. idle task) so check the flags and bail early. */
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