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[SPARC]: Fix exec failures on sun4c.

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This deals with a sun4c issue caused by commit b6a2fea393:
mm: variable length argument support.

The new way the code works means that sun4c_update_mmu_cache gets
called before a context has been selected, which results in invalid
operation of the underling mm code.

Simply ignoring update requests when there is no valid context solves
the problem.

Signed-off-by Mark Fortescue <mark@mtfhpc.demon.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mark Fortescue
2007-07-31 02:03:11 -07:00
committed by David S. Miller
parent 2fa3195d72
commit da4e9fea85
1 changed files with 3 additions and 0 deletions
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3
arch/sparc/mm/sun4c.c
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@@ -1999,6 +1999,9 @@ void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, p
unsigned long flags; unsigned long flags;
int pseg; int pseg;
if (vma->vm_mm->context == NO_CONTEXT)
return;
local_irq_save(flags); local_irq_save(flags);
address &= PAGE_MASK; address &= PAGE_MASK;
if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {