[PATCH 2/2] powerpc: Show PAGE_SIZE in __die() output

[Michael Ellerman]

The page size the kernel is built with is useful info when debugging a
crash, so add it to the output in __die().

Result looks like eg:

  kernel BUG at drivers/misc/lkdtm/bugs.c:63!
  Oops: Exception in kernel mode, sig: 5 [#1]
  LE PAGE_SIZE=64K SMP NR_CPUS=2048 NUMA pSeries
  Modules linked in: vmx_crypto kvm binfmt_misc ip_tables

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/kernel/traps.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 431a86d3f772..fc972e4eee5f 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -268,6 +268,18 @@ static int __die(const char *str, struct pt_regs *regs, long err)
 	else
 		seq_buf_puts(&s, "BE ");
 
+	seq_buf_puts(&s, "PAGE_SIZE=");
+	if (IS_ENABLED(CONFIG_PPC_4K_PAGES))
+		seq_buf_puts(&s, "4K ");
+	else if (IS_ENABLED(CONFIG_PPC_16K_PAGES))
+		seq_buf_puts(&s, "16K ");
+	else if (IS_ENABLED(CONFIG_PPC_64K_PAGES))
+		seq_buf_puts(&s, "64K ");
+	else if (IS_ENABLED(CONFIG_PPC_256K_PAGES))
+		seq_buf_puts(&s, "256K ");
+	else
+		BUILD_BUG_ON(1);
+
 	if (IS_ENABLED(CONFIG_PREEMPT))
 		seq_buf_puts(&s, "PREEMPT ");
 
-- 
2.20.1