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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 dump printing cleanup from Thomas Gleixner:
 "Clean up the show_opcodes() printout so nested dumps can be properly
  differentiated"

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Avoid pr_cont() in show_opcodes()
This commit is contained in:
Linus Torvalds 2018-08-13 15:21:12 -07:00
commit 27a5250197
1 changed files with 9 additions and 19 deletions
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28
arch/x86/kernel/dumpstack.c
View file

@ -22,8 +22,6 @@
#include <asm/stacktrace.h>
#include <asm/unwind.h>
#define OPCODE_BUFSIZE 64
int panic_on_unrecovered_nmi;
int panic_on_io_nmi;
static int die_counter;
@ -93,26 +91,18 @@ static void printk_stack_address(unsigned long address, int reliable,
*/
void show_opcodes(u8 *rip, const char *loglvl)
{
unsigned int code_prologue = OPCODE_BUFSIZE * 2 / 3;
#define PROLOGUE_SIZE 42
#define EPILOGUE_SIZE 21
#define OPCODE_BUFSIZE (PROLOGUE_SIZE + 1 + EPILOGUE_SIZE)
u8 opcodes[OPCODE_BUFSIZE];
u8 *ip;
int i;
printk("%sCode: ", loglvl);
ip = (u8 *)rip - code_prologue;
if (probe_kernel_read(opcodes, ip, OPCODE_BUFSIZE)) {
pr_cont("Bad RIP value.\n");
return;
if (probe_kernel_read(opcodes, rip - PROLOGUE_SIZE, OPCODE_BUFSIZE)) {
printk("%sCode: Bad RIP value.\n", loglvl);
} else {
printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %"
__stringify(EPILOGUE_SIZE) "ph\n", loglvl, opcodes,
opcodes[PROLOGUE_SIZE], opcodes + PROLOGUE_SIZE + 1);
}
for (i = 0; i < OPCODE_BUFSIZE; i++, ip++) {
if (ip == rip)
pr_cont("<%02x> ", opcodes[i]);
else
pr_cont("%02x ", opcodes[i]);
}
pr_cont("\n");
}
void show_ip(struct pt_regs *regs, const char *loglvl)