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FAILED: patch "[PATCH] x86/function_graph: Simplify with function_graph_enter()" failed to apply to 4.4-stable tree

PATCH [email protected] 1 participant 1 message Dec 3, 2018

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The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 07f7175b43827640d1e69c9eded89aa089a234b4 Mon Sep 17 00:00:00 2001

From: "Steven Rostedt (VMware)" <[email protected]>
Date: Sun, 18 Nov 2018 17:14:10 -0500
Subject: [PATCH] x86/function_graph: Simplify with function_graph_enter()

The function_graph_enter() function does the work of calling the function graph hook function and the management of the shadow stack, simplifying the work done in the architecture dependent prepare_ftrace_return().

Have x86 use the new code, and remove the shadow stack management as well as having to set up the trace structure.

This is needed to prepare for a fix of a design bug on how the curr_ret_stack is used.

Cc Thomas Gleixner <[email protected]>
Cc Ingo Molnar <[email protected]>
Cc Borislav Petkov <[email protected]>
Cc "H. Peter Anvin" <[email protected]>
Cc [email protected]
Cc [email protected]
Fixes 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by Masami Hiramatsu <[email protected]>
Signed-off-by Steven Rostedt (VMware) <[email protected]>
arch/x86/kernel/ftrace.c +1 -14
index 01ebcb6f263e..7ee8067cbf45 100644
@@ -994,7 +994,6 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent,
 {
 	unsigned long old;
 	int faulted;
-	struct ftrace_graph_ent trace;
 	unsigned long return_hooker = (unsigned long)
 				&return_to_handler;
 

@@ -1046,19 +1045,7 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent,
 		return;
 	}
 
-	trace.func = self_addr;
-	trace.depth = current->curr_ret_stack + 1;
-
-	/* Only trace if the calling function expects to */
-	if (!ftrace_graph_entry(&trace)) {
+	if (function_graph_enter(old, self_addr, frame_pointer, parent))
 		*parent = old;
-		return;
-	}
-
-	if (ftrace_push_return_trace(old, self_addr, &trace.depth,
-				     frame_pointer, parent) == -EBUSY) {
-		*parent = old;
-		return;
-	}
 }
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */