[PARISC] Add __read_mostly section for parisc

Flag a whole bunch of things as __read_mostly on parisc. Also flag a few
branches as unlikely() and cleanup a bit of code.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

drivers/parisc/pdc_stable.c

@@ -70,7 +70,7 @@ MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(PDCS_VERSION);
 
-static unsigned long pdcs_size = 0;
+static unsigned long pdcs_size __read_mostly;
 
 /* This struct defines what we need to deal with a parisc pdc path entry */
 struct pdcspath_entry {