[PATCH bpf-next v3 1/6] riscv: Use arch_stack_walk() for the kernel callchain

[Varun R Mallya <varunrmallya@gmail.com>]

Replace walk_stackframe() with generic arch_stack_walk() which
already wraps walk_stackframe() and is the generic mechanism used in
archs like arm64 to build the kernel callchain.

Also decouples perf from the internal walk_stackframe unwinder which
is modified in later commits to accept a different function signature,
which warranted this change.

Signed-off-by: Varun R Mallya <varunrmallya@gmail.com>
---
 arch/riscv/kernel/perf_callchain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c
index b465bc9eb870..93a12d53aa26 100644
--- a/arch/riscv/kernel/perf_callchain.c
+++ b/arch/riscv/kernel/perf_callchain.c
@@ -2,6 +2,7 @@
 /* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
 
 #include <linux/perf_event.h>
+#include <linux/stacktrace.h>
 #include <linux/uaccess.h>
 
 #include <asm/stacktrace.h>
@@ -44,5 +45,5 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 		return;
 	}
 
-	walk_stackframe(NULL, regs, fill_callchain, entry);
+	arch_stack_walk(fill_callchain, entry, current, regs);
 }
-- 
2.55.0