mtd/include/linux/mtd map.h,1.44,1.45

[bjd at infradead.org]

Update of /home/cvs/mtd/include/linux/mtd
In directory phoenix.infradead.org:/home/bjd/mtd/include/linux/mtd

Modified Files:
	map.h 
Log Message:
fix to ensure that if we have a remainer in the number of `unsigned longs`
to represent a given width then it is handled ok 


Index: map.h
===================================================================
RCS file: /home/cvs/mtd/include/linux/mtd/map.h,v
retrieving revision 1.44
retrieving revision 1.45
diff -u -r1.44 -r1.45
--- map.h	16 Sep 2004 23:26:08 -0000	1.44
+++ map.h	21 Sep 2004 14:31:17 -0000	1.45
@@ -56,6 +56,11 @@
 #define map_bankwidth_is_4(map) (0)
 #endif
 
+/* ensure we never evaluate anything shorted than an unsigned long
+ * to zero, and ensure we'll never miss the end of an comparison (bjd) */
+
+#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
+
 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
 # ifdef map_bankwidth
 #  undef map_bankwidth
@@ -64,12 +69,12 @@
 #   undef map_bankwidth_is_large
 #   define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 #   undef map_words
-#   define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#   define map_words(map) map_calc_words(map)
 #  endif
 # else
 #  define map_bankwidth(map) 8
 #  define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
-#  define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#  define map_words(map) map_calc_words(map)
 # endif
 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
 #undef MAX_MAP_BANKWIDTH
@@ -85,11 +90,11 @@
 #  undef map_bankwidth_is_large
 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 #  undef map_words
-#  define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#  define map_words(map) map_calc_words(map)
 # else
 #  define map_bankwidth(map) 16
 #  define map_bankwidth_is_large(map) (1)
-#  define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#  define map_words(map) map_calc_words(map)
 # endif
 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
 #undef MAX_MAP_BANKWIDTH
@@ -105,11 +110,11 @@
 #  undef map_bankwidth_is_large
 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 #  undef map_words
-#  define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#  define map_words(map) map_calc_words(map)
 # else
 #  define map_bankwidth(map) 32
 #  define map_bankwidth_is_large(map) (1)
-#  define map_words(map) (map_bankwidth(map) / sizeof(unsigned long))
+#  define map_words(map) map_calc_words(map)
 # endif
 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
 #undef MAX_MAP_BANKWIDTH