Blackfin: use raw_smp_processor_id() in exception code

When preempt debugging is enabled, smp_processor_id() may utilize the
"current" structure.  This may not be safe to access under all exceptions
due to it being in dynamically allocated memory.  So in exception code,
make sure we use raw_smp_processor_id() instead to get at the real value
directly.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 7b3ba06e10ad..56464cb8edf3 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -227,7 +227,7 @@ asmlinkage void double_fault_c(struct pt_regs *fp)
         printk(KERN_EMERG "Double Fault\n");
 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
-                unsigned int cpu = smp_processor_id();
+                unsigned int cpu = raw_smp_processor_id();
                 char buf[150];
                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
@@ -263,7 +263,7 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
         int j;
 #endif
 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
-        unsigned int cpu = smp_processor_id();
+        unsigned int cpu = raw_smp_processor_id();
 #endif
         const char *strerror = NULL;
         int sig = 0;
@@ -1098,7 +1098,7 @@ void show_regs(struct pt_regs *fp)
         struct irqaction *action;
         unsigned int i;
         unsigned long flags = 0;
-        unsigned int cpu = smp_processor_id();
+        unsigned int cpu = raw_smp_processor_id();
         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
 
         verbose_printk(KERN_NOTICE "\n");
@@ -1126,13 +1126,13 @@ void show_regs(struct pt_regs *fp)
 
         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
-                (long)fp->seqstat, fp->ipend, cpu_pda[smp_processor_id()].ex_imask, fp->syscfg);
+                (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
         if (fp->ipend & EVT_IRPTEN)
                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
-        if (!(cpu_pda[smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
+        if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
-        if (!(cpu_pda[smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
+        if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",