ftrace: Only allocate the ret_stack 'fp' field when needed
This saves some memory when HAVE_FUNCTION_GRAPH_FP_TEST isn't defined. On x86_64 with newer versions of gcc which have -mfentry, it saves 400 bytes per task. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nilay Vaish <nilayvaish@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/5c7747d9ea7b5cb47ef0a8ce8a6cea6bf7aa94bf.1471607358.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -795,7 +795,9 @@ struct ftrace_ret_stack {
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unsigned long func;
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unsigned long long calltime;
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unsigned long long subtime;
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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unsigned long fp;
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#endif
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};
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/*
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@ -171,7 +171,9 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
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current->ret_stack[index].func = func;
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current->ret_stack[index].calltime = calltime;
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current->ret_stack[index].subtime = 0;
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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current->ret_stack[index].fp = frame_pointer;
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#endif
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*depth = current->curr_ret_stack;
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return 0;
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