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From:   Stephen Boyd <swboyd@chromium.org>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, Jiri Olsa <jolsa@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Jessica Yu <jeyu@kernel.org>,
        Evan Green <evgreen@chromium.org>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Matthew Wilcox <willy@infradead.org>
Subject: [PATCH v3 06/12] x86/dumpstack: Use %pSb for backtrace printing
Date:   Tue, 30 Mar 2021 20:05:14 -0700
Message-Id: <20210331030520.3816265-7-swboyd@chromium.org>
In-Reply-To: <20210331030520.3816265-1-swboyd@chromium.org>
References: <20210331030520.3816265-1-swboyd@chromium.org>
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Let's use the new printk format to print the stacktrace entry when
printing a backtrace to the kernel logs. This will include any module's
build ID[1] in it so that offline/crash debugging can easily locate the
debuginfo for a module via something like debuginfod[2].

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: <x86@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Link: https://fedoraproject.org/wiki/Releases/FeatureBuildId [1]
Link: https://sourceware.org/elfutils/Debuginfod.html [2]
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/x86/kernel/dumpstack.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 299c20f0a38b..7ad5eea99b2b 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -143,9 +143,9 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl)
 void show_ip(struct pt_regs *regs, const char *loglvl)
 {
 #ifdef CONFIG_X86_32
-	printk("%sEIP: %pS\n", loglvl, (void *)regs->ip);
+	printk("%sEIP: %pSb\n", loglvl, (void *)regs->ip);
 #else
-	printk("%sRIP: %04x:%pS\n", loglvl, (int)regs->cs, (void *)regs->ip);
+	printk("%sRIP: %04x:%pSb\n", loglvl, (int)regs->cs, (void *)regs->ip);
 #endif
 	show_opcodes(regs, loglvl);
 }
-- 
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