diff options
| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2010-02-26 16:01:17 -0600 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-02-28 19:42:31 +0100 |
| commit | 1b7d0d28ad82cbd5650c26ec8e370176b112e407 (patch) | |
| tree | 5b7cd9a673ad2fe6c28d141d8822b0ea80095bd4 /drivers/block/cciss_cmd.h | |
| parent | 58daa9ce96b847ed130453f5fdd63c579fb1f84f (diff) | |
cciss: detect bad alignment of scsi commands at build time
cciss: detect bad alignment of scsi commands at build time
Incidentally fix some nearby c++ style comments.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block/cciss_cmd.h')
| -rw-r--r-- | drivers/block/cciss_cmd.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h index 515c9f03c20..e624ff959cb 100644 --- a/drivers/block/cciss_cmd.h +++ b/drivers/block/cciss_cmd.h @@ -167,10 +167,13 @@ typedef struct _SGDescriptor_struct { #define CMD_MSG_TIMEOUT 0x05 #define CMD_MSG_STALE 0xff -/* This structure needs to be divisible by 8 for new - * indexing method. PAD_32 and PAD_64 can be adjusted - * independently as needed for 32-bit and 64-bits systems. +/* This structure needs to be divisible by COMMANDLIST_ALIGNMENT + * because low bits of the address are used to to indicate that + * whether the tag contains an index or an address. PAD_32 and + * PAD_64 can be adjusted independently as needed for 32-bit + * and 64-bits systems. */ +#define COMMANDLIST_ALIGNMENT (8) #define IS_64_BIT ((sizeof(long) - 4)/4) #define IS_32_BIT (!IS_64_BIT) #define PAD_32 (0) |