Re: [PATCH v2] powerpc/tm: Print 64-bits MSR

[Christophe LEROY]

Le 07/08/2018 à 15:35, Breno Leitao a écrit :
On a kernel TM Bad thing program exception, the Machine State Register
(MSR) is not being properly displayed. The exception code dumps a 32-bits
value but MSR is a 64 bits register for all platforms that have HTM
enabled.

This patch dumps the MSR value as a 64-bits value instead of 32 bits. In
order to do so, the 'reason' variable could not be used, since it trimmed
MSR to 32-bits (int).

reason is not always regs->msr, see get_reason(), allthough in your case 
it is.

I think it would be better to change 'reason' to 'unsigned long' instead 
of replacing it by regs->msr for the printk.

Christophe



Signed-off-by: Breno Leitao <lei...@debian.org>
---
  arch/powerpc/kernel/traps.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0e17dcb48720..cd561fd89532 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1402,7 +1402,7 @@ void program_check_exception(struct pt_regs *regs)
                        goto bail;
                } else {
                        printk(KERN_EMERG "Unexpected TM Bad Thing exception "
-                              "at %lx (msr 0x%x)\n", regs->nip, reason);
+                              "at %lx (msr 0x%lx)\n", regs->nip, regs->msr);
                        die("Unrecoverable exception", regs, SIGABRT);
                }
        }