linux-kernel - [PATCH RFC 7/8] x86: stacktrace: Make callbacks use new prototype with frame info

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Date:   Mon, 18 Apr 2022 21:22:16 +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 7/8] x86: 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/x86/kernel/stacktrace.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index ee117fcf46ed..c88bfbb5f157 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -16,15 +16,18 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
 		     struct task_struct *task, struct pt_regs *regs)
 {
 	struct unwind_state state;
-	unsigned long addr;
+	struct frame_info fi;
 
-	if (regs && !consume_entry(cookie, regs->ip))
-		return;
+	if (regs) {
+		fi.pc = regs->ip;
+		if (!consume_entry(cookie, &fi))
+			return;
+	}
 
 	for (unwind_start(&state, task, regs, NULL); !unwind_done(&state);
 	     unwind_next_frame(&state)) {
-		addr = unwind_get_return_address(&state);
-		if (!addr || !consume_entry(cookie, addr))
+		fi.pc = unwind_get_return_address(&state);
+		if (!fi.pc || !consume_entry(cookie, &fi))
 			break;
 	}
 }
@@ -34,7 +37,7 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
 {
 	struct unwind_state state;
 	struct pt_regs *regs;
-	unsigned long addr;
+	struct frame_info fi;
 
 	for (unwind_start(&state, task, NULL, NULL);
 	     !unwind_done(&state) && !unwind_error(&state);
@@ -56,17 +59,17 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
 				return -EINVAL;
 		}
 
-		addr = unwind_get_return_address(&state);
+		fi.pc = unwind_get_return_address(&state);
 
 		/*
 		 * A NULL or invalid return address probably means there's some
 		 * generated code which __kernel_text_address() doesn't know
 		 * about.
 		 */
-		if (!addr)
+		if (!fi.pc)
 			return -EINVAL;
 
-		if (!consume_entry(cookie, addr))
+		if (!consume_entry(cookie, &fi))
 			return -EINVAL;
 	}
 
@@ -107,8 +110,10 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
 			  const struct pt_regs *regs)
 {
 	const void __user *fp = (const void __user *)regs->bp;
+	struct frame_info fi;
 
-	if (!consume_entry(cookie, regs->ip))
+	fi.pc = regs->ip;
+	if (!consume_entry(cookie, &fi))
 		return;
 
 	while (1) {
@@ -122,7 +127,8 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
 			break;
 		if (!frame.ret_addr)
 			break;
-		if (!consume_entry(cookie, frame.ret_addr))
+		fi.pc = frame.ret_addr;
+		if (!consume_entry(cookie, &fi))
 			break;
 		fp = frame.next_fp;
 	}
-- 
2.25.1