powerpc/pseries: Fix dedicated processor partition detection

commit f13c13a00512 (powerpc: Stop using non-architected shared_proc
field in lppaca) fixed a potential issue with shared/dedicated
partition detection. The old method of detection relied on an
unarchitected field (shared_proc), and this patch switched
to using something architected (a non zero yield_count).

Unfortunately the assertion in the Linux header that yield_count
is only non zero on shared processor partitions is not true. It
turns out dedicated processor partitions can increment yield_count
and as such we falsely detect dedicated partitions as shared.

Fix the comment, and switch back to using the old method.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index 4470d1e..844c28d 100644 (file)
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -84,8 +84,8 @@ struct lppaca {
         * the processor is yielded (either because of an OS yield or a
         * hypervisor preempt).  An even value implies that the processor is
         * currently executing.
-        * NOTE: This value will ALWAYS be zero for dedicated processors and
-        * will NEVER be zero for shared processors (ie, initialized to a 1).
+        * NOTE: Even dedicated processor partitions can yield so this
+        * field cannot be used to determine if we are shared or dedicated.
         */
        volatile __be32 yield_count;
        volatile __be32 dispersion_count; /* dispatch changed physical cpu */
@@ -106,15 +106,15 @@ extern struct lppaca lppaca[];
 #define lppaca_of(cpu) (*paca[cpu].lppaca_ptr)
 
 /*
- * Old kernels used a reserved bit in the VPA to determine if it was running
- * in shared processor mode. New kernels look for a non zero yield count
- * but KVM still needs to set the bit to keep the old stuff happy.
+ * We are using a non architected field to determine if a partition is
+ * shared or dedicated. This currently works on both KVM and PHYP, but
+ * we will have to transition to something better.
  */
 #define LPPACA_OLD_SHARED_PROC         2
 
 static inline bool lppaca_shared_proc(struct lppaca *l)
 {
-       return l->yield_count != 0;
+       return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
 }
 
 /*