[PATCH v2 10/10] powerpc/configs/skiroot: Enable CONFIG_PRINTK_CALLER

[Michael Ellerman]

This adds the CPU or thread number to printk messages. This can help
decipher concurrent oopses that have been interleaved.

Example output, of PID1 (T1) triggering a warning:

  [    1.581678][    T1] WARNING: CPU: 0 PID: 1 at crypto/rsa-pkcs1pad.c:539 pkcs1pad_verify+0x38/0x140
  [    1.581681][    T1] Modules linked in:
  [    1.581693][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc5-gcc-8.2.0-00121-gf84c2e595927-dirty #1515
  [    1.581700][    T1] NIP:  c000000000207d64 LR: c000000000207d3c CTR: c000000000207d2c
  [    1.581708][    T1] REGS: c0000000fd2e7560 TRAP: 0700   Not tainted  (5.5.0-rc5-gcc-8.2.0-00121-gf84c2e595927-dirty)
  [    1.581712][    T1] MSR:  9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 44000222  XER: 00040000

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/configs/skiroot_defconfig | 1 +
 1 file changed, 1 insertion(+)

v2: New.

diff --git a/arch/powerpc/configs/skiroot_defconfig b/arch/powerpc/configs/skiroot_defconfig
index ca6f1842aa29..ae1d7137a84e 100644
--- a/arch/powerpc/configs/skiroot_defconfig
+++ b/arch/powerpc/configs/skiroot_defconfig
@@ -294,6 +294,7 @@ CONFIG_LIBCRC32C=y
 # CONFIG_XZ_DEC_ARMTHUMB is not set
 # CONFIG_XZ_DEC_SPARC is not set
 CONFIG_PRINTK_TIME=y
+CONFIG_PRINTK_CALLER=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_SLUB_DEBUG_ON=y
 CONFIG_SCHED_STACK_END_CHECK=y
-- 
2.21.1