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86bcbafcb7
Unlike most architectures (and only in keeping with powerpc), arm64 has a non __sched() function on the path to our cpu_switch_to() assembly function. It is expected that for a blocked task, in_sched_functions() can be used to skip all functions between the raw context switch assembly and the scheduler functions that call into __switch_to(). This is the behaviour expected by stack_trace_consume_entry_nosched(), and the behaviour we'd like to have such that we an simplify arm64's __get_wchan() implementation to use arch_stack_walk(). This patch mark's arm64's __switch_to as __sched. This *will not* change the behaviour of arm64's current __get_wchan() implementation, which always performs an initial unwind step which skips __switch_to(). This *will* change the behaviour of stack_trace_consume_entry_nosched() and stack_trace_save_tsk() to match their expected behaviour on blocked tasks, skipping all scheduler-internal functions including __switch_to(). Other than the above, there should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20211129142849.3056714-4-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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