[PATCH -V2 08/26] powerpc: Clarify __pgtable_cache_add by renaming shift to index

[Aneesh Kumar K.V]

From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>

With table_size as second argument, first argument of the function
is not the shift value, but rather index into the array. Rename the
variable to clarify the same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/pgtable-ppc64.h |    2 +-
 arch/powerpc/mm/init_64.c                |   16 ++++++++--------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
index d51d893..658ba7c 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -338,7 +338,7 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 #define pgoff_to_pte(off)	((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 #define PTE_FILE_MAX_BITS	(BITS_PER_LONG - PTE_RPN_SHIFT)
 
-extern void __pgtable_cache_add(unsigned shift, unsigned long table_size,
+extern void __pgtable_cache_add(unsigned index, unsigned long table_size,
 				void (*ctor)(void *));
 void pgtable_cache_init(void);
 static inline void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index d6df419..2e09ec1 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -100,7 +100,7 @@ struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
  * everything else.  Caches created by this function are used for all
  * the higher level pagetables, and for hugepage pagetables.
  */
-void __pgtable_cache_add(unsigned int shift, unsigned long table_size,
+void __pgtable_cache_add(unsigned int index, unsigned long table_size,
 			 void (*ctor)(void *))
 {
 	char *name;
@@ -110,8 +110,8 @@ void __pgtable_cache_add(unsigned int shift, unsigned long table_size,
 	 * the index size in the low bits.  Table alignment must be
 	 * big enough to fit it.
 	 *
-	 * Likewise, hugeapge pagetable pointers contain a (different)
-	 * shift value in the low bits.  All tables must be aligned so
+	 * Likewise, hugepage pagetable pointers contain a (different)
+	 * huge page size in the low bits.  All tables must be aligned so
 	 * as to leave enough 0 bits in the address to contain it. */
 	unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1,
 				     HUGEPD_SHIFT_MASK + 1);
@@ -121,17 +121,17 @@ void __pgtable_cache_add(unsigned int shift, unsigned long table_size,
 	 * moment, gcc doesn't seem to recognize is_power_of_2 as a
 	 * constant expression, so so much for that. */
 	BUG_ON(!is_power_of_2(minalign));
-	BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE));
+	BUG_ON((index < 1) || (index > MAX_PGTABLE_INDEX_SIZE));
 
-	if (PGT_CACHE(shift))
+	if (PGT_CACHE(index))
 		return; /* Already have a cache of this size */
 
 	align = max_t(unsigned long, align, minalign);
-	name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift);
+	name = kasprintf(GFP_KERNEL, "pgtable-2^%d", index);
 	new = kmem_cache_create(name, table_size, align, 0, ctor);
-	PGT_CACHE(shift) = new;
+	PGT_CACHE(index) = new;
 
-	pr_debug("Allocated pgtable cache for order %d\n", shift);
+	pr_debug("Allocated pgtable cache for order %d\n", index);
 }
 
 
-- 
1.7.10