[PATCH 1/2] arm64: Correcting format specifier for printin 64 bit addresses

[Maninder Singh]

This patch corrects format specifier for printing 64 bit addresses.

Before Patch
============
[   68.251603] Unable to handle kernel NULL pointer dereference at virtual 
address 00000000
[   68.251673] pgd = ffffffc013950000
[   68.251782] [00000000] *pgd=0000000093e19003, *pud=0000000093e19003, 
*pmd=0000000000000000

After patch
===========
[    8.565030] Unable to handle kernel NULL pointer dereference at virtual 
address 0000000000000000
[    8.565389] pgd = ffffffc013872000
[    8.565553] [0000000000000000] *pgd=0000000093874003, *pud=0000000093874003, 
*pmd=0000000000000000

and same for user space fault.

Signed-off-by: Vaneet Narang <v.nar...@samsung.com>
Signed-off-by: Maninder Singh <maninder...@samsung.com>
---
 arch/arm64/mm/fault.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index a78a5c4..8cb5c93 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
 
        pr_alert("pgd = %p\n", mm->pgd);
        pgd = pgd_offset(mm, addr);
-       pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
+       pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
 
        do {
                pud_t *pud;
@@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, 
unsigned long addr,
         * No handler, we'll have to terminate things with extreme prejudice.
         */
        bust_spinlocks(1);
-       pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+       pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
                 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
                 "paging request", addr);
 
@@ -198,9 +198,15 @@ static void __do_user_fault(struct task_struct *tsk, 
unsigned long addr,
        struct siginfo si;
 
        if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) 
{
-               pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
-                       tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
-                       addr, esr);
+               if (compat_user_mode(regs))
+                       pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 
0x%03x\n",
+                               tsk->comm, task_pid_nr(tsk), fault_name(esr), 
sig,
+                               addr, esr);
+               else
+                       pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 
0x%03x\n",
+                               tsk->comm, task_pid_nr(tsk), fault_name(esr), 
sig,
+                               addr, esr);
+
                show_pte(tsk->mm, addr);
                show_regs(regs);
        }
-- 
1.9.1