Le 08/01/2019 à 13:05, Michael Ellerman a écrit :
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 <m...@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 ");
Can't we build all the above at once using PAGE_SHIFT ?
Something like (untested):
"%dK ", 1 << (PAGE_SHIFT - 10)
Christophe
+ else
+ BUILD_BUG_ON(1);
+
if (IS_ENABLED(CONFIG_PREEMPT))
seq_buf_puts(&s, "PREEMPT ");
