powerpc: Save the TAR register earlier

[pandora-kernel.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index c517dbe..8083be2 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -600,6 +600,16 @@ struct task_struct *__switch_to(struct task_struct *prev,
        struct ppc64_tlb_batch *batch;
 #endif
 
+       /* Back up the TAR across context switches.
+        * Note that the TAR is not available for use in the kernel.  (To
+        * provide this, the TAR should be backed up/restored on exception
+        * entry/exit instead, and be in pt_regs.  FIXME, this should be in
+        * pt_regs anyway (for debug).)
+        * Save the TAR here before we do treclaim/trecheckpoint as these
+        * will change the TAR.
+        */
+       save_tar(&prev->thread);
+
        __switch_to_tm(prev);
 
 #ifdef CONFIG_SMP