x86/alternatives: Add pr_fmt() to debug macros

... in order to have debug output prefixed with the pr_fmt text "SMP
alternatives:" which allows easy grepping:

  $ dmesg | grep "SMP alternatives"
  [    0.167783] SMP alternatives: alt table ffffffff8272c780, -> ffffffff8272fd6e
  [    0.168620] SMP alternatives: feat: 3*32+16, old: (x86_64_start_kernel+0x37/0x73 \
		  (ffffffff826093f7) len: 5), repl: (ffffffff8272fd6e, len: 5), pad: 0
  [    0.170103] SMP alternatives: ffffffff826093f7: old_insn: e8 54 a8 da fe
  [    0.171184] SMP alternatives: ffffffff8272fd6e: rpl_insn: e8 cd 3e c8 fe
  ...

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200615175315.17301-1-bp@alien8.de

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 8fd39ff..9e7dc37 100644 (file)
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -53,7 +53,7 @@ __setup("noreplace-smp", setup_noreplace_smp);
 #define DPRINTK(fmt, args...)                                          \
 do {                                                                   \
        if (debug_alternative)                                          \
-               printk(KERN_DEBUG "%s: " fmt "\n", __func__, ##args);   \
+               printk(KERN_DEBUG pr_fmt(fmt) "\n", ##args);            \
 } while (0)
 
 #define DUMP_BYTES(buf, len, fmt, args...)                             \
@@ -64,7 +64,7 @@ do {                                                                  \
                if (!(len))                                             \
                        break;                                          \
                                                                        \
-               printk(KERN_DEBUG fmt, ##args);                         \
+               printk(KERN_DEBUG pr_fmt(fmt), ##args);                 \
                for (j = 0; j < (len) - 1; j++)                         \
                        printk(KERN_CONT "%02hhx ", buf[j]);            \
                printk(KERN_CONT "%02hhx\n", buf[j]);                   \