[PATCH v3] ARM: mm: Provide better message when kernel fault

Kefeng Wang
2022-09-27T06:18:22Z

If there is a kernel fault, see do_kernel_fault(), we only print
the generic "paging request" or "NULL pointer dereference" message
which don't show read, write or excute information, let's provide
better fault message for them.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
v3: show the infos in die_kernel_fault()
arch/arm/mm/fault.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 46cccd6bf705..f8fe0ec64c23 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -111,8 +111,9 @@ static void die_kernel_fault(const char *msg, struct mm_struct *mm,
{
bust_spinlocks(1);
pr_alert("8<--- cut here ---\n");
- pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
- msg, addr);
+ pr_alert("Unable to handle kernel %s at virtual address %08lx when %s\n",
+ msg, addr, fsr & FSR_LNX_PF ? "execute" :
+ fsr & FSR_WRITE ? "write" : "read");

show_pte(KERN_ALERT, mm, addr);
die("Oops", regs, fsr);
--
2.35.3