linux-kernel - [PATCH 5/9] x86/dumpstack: Add loglevel argument to show

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Date:   Tue, 17 Apr 2018 18:11:20 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/9] x86/dumpstack: Add loglevel argument to show_opcodes()

From: Borislav Petkov <bp@...e.de>

Will be used in the next patch.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/include/asm/stacktrace.h | 1 +
 arch/x86/kernel/dumpstack.c       | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index 133d9425fced..0630eeb18bbc 100644
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -111,4 +111,5 @@ static inline unsigned long caller_frame_pointer(void)
 	return (unsigned long)frame;
 }
 
+void show_opcodes(u8 *rip, const char *loglvl);
 #endif /* _ASM_X86_STACKTRACE_H */
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 1d6698b54527..1592d0c3ebb5 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -70,14 +70,14 @@ static void printk_stack_address(unsigned long address, int reliable,
 	printk("%s %s%pB\n", log_lvl, reliable ? "" : "? ", (void *)address);
 }
 
-static void show_opcodes(u8 *rip)
+void show_opcodes(u8 *rip, const char *loglvl)
 {
 	unsigned int code_prologue = OPCODE_BUFSIZE * 2 / 3;
 	u8 opcodes[OPCODE_BUFSIZE];
 	u8 *ip;
 	int i;
 
-	printk(KERN_DEFAULT "Code: ");
+	printk("%sCode: ", loglvl);
 
 	ip = (u8 *)rip - code_prologue;
 	if (probe_kernel_read(opcodes, ip, OPCODE_BUFSIZE)) {
@@ -401,6 +401,6 @@ void show_regs(struct pt_regs *regs)
 		if (regs->ip < PAGE_OFFSET)
 			printk(KERN_DEFAULT "Code: Bad RIP value.\n");
 		else
-			show_opcodes((u8 *)regs->ip);
+			show_opcodes((u8 *)regs->ip, KERN_DEFAULT);
 	}
 }
-- 
2.13.0