Florent Revest e2c7a05a48 samples: ftrace: Save required argument registers in sample trampolines ... commit 8564c31587 upstream. The ftrace-direct-too sample traces the handle_mm_fault function whose signature changed since the introduction of the sample. Since: commit bce617edec ("mm: do page fault accounting in handle_mm_fault") handle_mm_fault now has 4 arguments. Therefore, the sample trampoline should save 4 argument registers. s390 saves all argument registers already so it does not need a change but x86_64 needs an extra push and pop. This also evolves the signature of the tracing function to make it mirror the signature of the traced function. Link: https://lkml.kernel.org/r/20230427140700.625241-2-revest@chromium.org Cc: stable@vger.kernel.org Fixes: bce617edec ("mm: do page fault accounting in handle_mm_fault") Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Florent Revest <revest@chromium.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-07-23 13:49:44 +02:00
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ftrace	samples: ftrace: Save required argument registers in sample trampolines	2023-07-23 13:49:44 +02:00
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