tile: don't call show_regs_print_info() with corrupt current

We use the validate_current() API to make sure that "current" seems
plausible before using it.  With the new show_regs_print_info()
API, we want to check that current is OK before calling it, since
otherwise we will end up in a recursive panic.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 663289b..44cdc4a 100644 (file)
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -226,19 +226,20 @@ int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
                        (unsigned int __user *)adr);
 }
 
+static struct task_struct corrupt_current = { .comm = "<corrupt>" };
+
 /*
  * Return "current" if it looks plausible, or else a pointer to a dummy.
  * This can be helpful if we are just trying to emit a clean panic.
  */
 struct task_struct *validate_current(void)
 {
-       static struct task_struct corrupt = { .comm = "<corrupt>" };
        struct task_struct *tsk = current;
        if (unlikely((unsigned long)tsk < PAGE_OFFSET ||
                     (high_memory && (void *)tsk > high_memory) ||
                     ((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
                pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
-               tsk = &corrupt;
+               tsk = &corrupt_current;
        }
        return tsk;
 }
@@ -589,7 +590,8 @@ void show_regs(struct pt_regs *regs)
        int i;
 
        pr_err("\n");
-       show_regs_print_info(KERN_ERR);
+       if (tsk != &corrupt_current)
+               show_regs_print_info(KERN_ERR);
 #ifdef __tilegx__
        for (i = 0; i < 17; i++)
                pr_err(" r%-2d: "REGFMT" r%-2d: "REGFMT" r%-2d: "REGFMT"\n",