gru: add symbolic names for GRU error code

Use symbol names instead of numbers for error return values for the vtop
functions.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index a1b3a1d66af5..3e644042c805 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -40,6 +40,12 @@
 #include "gru_instructions.h"
 #include <asm/uv/uv_hub.h>
 
+/* Return codes for vtop functions */
+#define VTOP_SUCCESS               0
+#define VTOP_INVALID               -1
+#define VTOP_RETRY                 -2
+
+
 /*
  * Test if a physical address is a valid GRU GSEG address
  */
@@ -280,12 +286,12 @@ static int gru_vtop(struct gru_thread_state *gts, unsigned long vaddr,
         paddr = paddr & ~((1UL << ps) - 1);
         *gpa = uv_soc_phys_ram_to_gpa(paddr);
         *pageshift = ps;
-        return 0;
+        return VTOP_SUCCESS;
 
 inval:
-        return -1;
+        return VTOP_INVALID;
 upm:
-        return -2;
+        return VTOP_RETRY;
 }
 
 
@@ -412,9 +418,9 @@ static int gru_try_dropin(struct gru_thread_state *gts,
                 goto failactive;
 
         ret = gru_vtop(gts, vaddr, write, atomic, &gpa, &pageshift);
-        if (ret == -1)
+        if (ret == VTOP_INVALID)
                 goto failinval;
-        if (ret == -2)
+        if (ret == VTOP_RETRY)
                 goto failupm;
 
         if (!(gts->ts_sizeavail & GRU_SIZEAVAIL(pageshift))) {