Patch "riscv: stacktrace: fix usage of ftrace_graph_ret_addr()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    riscv: stacktrace: fix usage of ftrace_graph_ret_addr()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     riscv-stacktrace-fix-usage-of-ftrace_graph_ret_addr.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 67e8ffc11e313593fe1941073c59908e69cc4240
Author: Puranjay Mohan <puranjay@xxxxxxxxxx>
Date:   Tue Jun 18 14:58:20 2024 +0000

    riscv: stacktrace: fix usage of ftrace_graph_ret_addr()
    
    [ Upstream commit 393da6cbb2ff89aadc47683a85269f913aa1c139 ]
    
    ftrace_graph_ret_addr() takes an `idx` integer pointer that is used to
    optimize the stack unwinding. Pass it a valid pointer to utilize the
    optimizations that might be available in the future.
    
    The commit is making riscv's usage of ftrace_graph_ret_addr() match
    x86_64.
    
    Signed-off-by: Puranjay Mohan <puranjay@xxxxxxxxxx>
    Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240618145820.62112-1-puranjay@xxxxxxxxxx
    Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index 94721c484d638..95b4ad1b6708c 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -34,6 +34,7 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
 			     bool (*fn)(void *, unsigned long), void *arg)
 {
 	unsigned long fp, sp, pc;
+	int graph_idx = 0;
 	int level = 0;
 
 	if (regs) {
@@ -70,7 +71,7 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
 			pc = regs->ra;
 		} else {
 			fp = frame->fp;
-			pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
+			pc = ftrace_graph_ret_addr(current, &graph_idx, frame->ra,
 						   &frame->ra);
 			if (pc == (unsigned long)ret_from_exception) {
 				if (unlikely(!__kernel_text_address(pc) || !fn(arg, pc)))




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