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cciss: clarify command list padding calculation

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cciss: clarify command list padding calculation

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Stephen M. Cameron 2010-02-26 16:01:12 -06:00 committed by Jens Axboe
parent 41647e7a91
commit 58daa9ce96
1 changed files with 7 additions and 2 deletions
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9
drivers/block/cciss_cmd.h
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@ -168,9 +168,14 @@ typedef struct _SGDescriptor_struct {
#define CMD_MSG_STALE 0xff #define CMD_MSG_STALE 0xff
/* This structure needs to be divisible by 8 for new /* This structure needs to be divisible by 8 for new
* indexing method. * indexing method. PAD_32 and PAD_64 can be adjusted
* independently as needed for 32-bit and 64-bits systems.
*/ */
#define PADSIZE (sizeof(long) - 4) #define IS_64_BIT ((sizeof(long) - 4)/4)
#define IS_32_BIT (!IS_64_BIT)
#define PAD_32 (0)
#define PAD_64 (4)
#define PADSIZE (IS_32_BIT * PAD_32 + IS_64_BIT * PAD_64)
typedef struct _CommandList_struct { typedef struct _CommandList_struct {
CommandListHeader_struct Header; CommandListHeader_struct Header;
RequestBlock_struct Request; RequestBlock_struct Request;