powerpc: Abstract indexing of lppaca structs

Currently we have the lppaca structs as a simple array of NR_CPUS
entries, taking up space in the data section of the kernel image.
In future we would like to allocate them dynamically, so this
abstracts out the accesses to the array, making it easier to
change how we locate the lppaca for a given cpu in future.
Specifically, lppaca[cpu] changes to lppaca_of(cpu).

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index 58e14fba11b..9b8182e8216 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -34,7 +34,7 @@ void __spin_yield(arch_spinlock_t *lock)
                 return;
         holder_cpu = lock_value & 0xffff;
         BUG_ON(holder_cpu >= NR_CPUS);
-        yield_count = lppaca[holder_cpu].yield_count;
+        yield_count = lppaca_of(holder_cpu).yield_count;
         if ((yield_count & 1) == 0)
                 return;         /* virtual cpu is currently running */
         rmb();
@@ -65,7 +65,7 @@ void __rw_yield(arch_rwlock_t *rw)
                 return;         /* no write lock at present */
         holder_cpu = lock_value & 0xffff;
         BUG_ON(holder_cpu >= NR_CPUS);
-        yield_count = lppaca[holder_cpu].yield_count;
+        yield_count = lppaca_of(holder_cpu).yield_count;
         if ((yield_count & 1) == 0)
                 return;         /* virtual cpu is currently running */
         rmb();