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sh: Fix up recursive fault in oops with unset TTB. 

Presently the oops code looks for the pgd either from the mm context or
the cached TTB value. There are presently cases where the TTB can be
unset or otherwise cleared by hardware, which we weren't handling,
resulting in recursive faults on the NULL pgd. In these cases we can
simply reload from swapper_pg_dir and continue on as normal.

Cc: stable@vger.kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2012-07-24 13:15:54 +09:00
parent 92f53a85db
commit 90eed7d87b
1 changed files with 6 additions and 2 deletions
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8
arch/sh/mm/fault.c
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@ -58,11 +58,15 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
if (mm)
if (mm) {
pgd = mm->pgd;
else
} else {
pgd = get_TTB();
if (unlikely(!pgd))
pgd = swapper_pg_dir;
}
printk(KERN_ALERT "pgd = %p\n", pgd);
pgd += pgd_index(addr);
printk(KERN_ALERT "[%08lx] *pgd=%0*Lx", addr,