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, 4 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index a00addb55945..adfd5441b612 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -107,14 +107,14 @@ static int dtl_enable(struct dtl *dtl)
         }
 
         /* set our initial buffer indices */
-        dtl->last_idx = lppaca[dtl->cpu].dtl_idx = 0;
+        dtl->last_idx = lppaca_of(dtl->cpu).dtl_idx = 0;
 
         /* ensure that our updates to the lppaca fields have occurred before
          * we actually enable the logging */
         smp_wmb();
 
         /* enable event logging */
-        lppaca[dtl->cpu].dtl_enable_mask = dtl_event_mask;
+        lppaca_of(dtl->cpu).dtl_enable_mask = dtl_event_mask;
 
         return 0;
 }
@@ -123,7 +123,7 @@ static void dtl_disable(struct dtl *dtl)
 {
         int hwcpu = get_hard_smp_processor_id(dtl->cpu);
 
-        lppaca[dtl->cpu].dtl_enable_mask = 0x0;
+        lppaca_of(dtl->cpu).dtl_enable_mask = 0x0;
 
         unregister_dtl(hwcpu, __pa(dtl->buf));
 
@@ -171,7 +171,7 @@ static ssize_t dtl_file_read(struct file *filp, char __user *buf, size_t len,
         /* actual number of entries read */
         n_read = 0;
 
-        cur_idx = lppaca[dtl->cpu].dtl_idx;
+        cur_idx = lppaca_of(dtl->cpu).dtl_idx;
         last_idx = dtl->last_idx;
 
         if (cur_idx - last_idx > dtl->buf_entries) {