linux-kernel - [PATCH RFC 4/8] powerpc: stacktrace: Make callbacks use new prototype with frame info

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Message-Id: <20220418132217.1573072-5-zhe.he@windriver.com>
Date:   Mon, 18 Apr 2022 21:22:13 +0800
From:   He Zhe <zhe.he@...driver.com>
To:     catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        tglx@...utronix.de, bp@...en8.de, dave.hansen@...ux.intel.com,
        keescook@...omium.org, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, benh@...nel.crashing.org,
        paulus@...ba.org, borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        hpa@...or.com
Cc:     x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhe.he@...driver.com
Subject: [PATCH RFC 4/8] powerpc: stacktrace: Make callbacks use new prototype with frame info

stack_trace_consume_fn has been changed to
bool (*stack_trace_consume_fn)(void *cookie, struct frame_info *fi);
to be able to pass more information.

Turn to use pc in struct frame_info in arch_stack_walk callbacks without
functinoal change.

Signed-off-by: He Zhe <zhe.he@...driver.com>
---
 arch/powerpc/kernel/stacktrace.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index a2443d61728e..8640e9acfa29 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -28,9 +28,13 @@ void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_entry,
 					   struct task_struct *task, struct pt_regs *regs)
 {
 	unsigned long sp;
+	struct frame_info fi;
 
-	if (regs && !consume_entry(cookie, regs->nip))
-		return;
+	if (regs) {
+		fi.pc = regs->nip;
+		if (!consume_entry(cookie, &fi))
+			return;
+	}
 
 	if (regs)
 		sp = regs->gpr[1];
@@ -41,15 +45,15 @@ void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_entry,
 
 	for (;;) {
 		unsigned long *stack = (unsigned long *) sp;
-		unsigned long newsp, ip;
+		unsigned long newsp;
 
 		if (!validate_sp(sp, task, STACK_FRAME_OVERHEAD))
 			return;
 
 		newsp = stack[0];
-		ip = stack[STACK_FRAME_LR_SAVE];
+		fi.pc = stack[STACK_FRAME_LR_SAVE];
 
-		if (!consume_entry(cookie, ip))
+		if (!consume_entry(cookie, &fi))
 			return;
 
 		sp = newsp;
@@ -71,6 +75,7 @@ int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn consum
 	unsigned long stack_end;
 	int graph_idx = 0;
 	bool firstframe;
+	struct frame_info fi;
 
 	stack_end = stack_page + THREAD_SIZE;
 	if (!is_idle_task(task)) {
@@ -159,7 +164,8 @@ int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn consum
 			return -EINVAL;
 #endif
 
-		if (!consume_entry(cookie, ip))
+		fi.pc = ip;
+		if (!consume_entry(cookie, &fi))
 			return -EINVAL;
 	}
 	return 0;
-- 
2.25.1