[ARM] 4111/1: Allow VFP to work with thread migration on SMP

The current lazy saving of the VFP registers is no longer possible
with thread migration on SMP. This patch implements a per-CPU
vfp-state pointer and the saving of the VFP registers at every context
switch. The registers restoring is still performed in a lazy way.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-arm/fpstate.h b/include/asm-arm/fpstate.h
index 6af4e6bd1290..f31cda5a55ee 100644
--- a/include/asm-arm/fpstate.h
+++ b/include/asm-arm/fpstate.h
@@ -35,6 +35,9 @@ struct vfp_hard_struct {
          */
         __u32 fpinst;
         __u32 fpinst2;
+#ifdef CONFIG_SMP
+        __u32 cpu;
+#endif
 };
 
 union vfp_state {