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| author | Stefan Haberland <stefan.haberland@de.ibm.com> | 2009-09-11 10:28:29 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-09-11 10:29:41 +0200 |
| commit | 68b781fe1bed89011ab7c58ede8476abe64432d2 (patch) | |
| tree | afe2148854aa2f4eae370a2cf1855f80a9b5a8cb /drivers/s390/block/dasd.c | |
| parent | 97f604b07473669f4da52b1f859ee45e8d48d42a (diff) | |
| download | kernel_samsung_smdk4412-68b781fe1bed89011ab7c58ede8476abe64432d2.zip kernel_samsung_smdk4412-68b781fe1bed89011ab7c58ede8476abe64432d2.tar.gz kernel_samsung_smdk4412-68b781fe1bed89011ab7c58ede8476abe64432d2.tar.bz2 | |
[S390] dasd: optimize cpu usage in goodcase
remove unnecessary dbf call, remove string operations for magic
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd.c')
| -rw-r--r-- | drivers/s390/block/dasd.c | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index f8445b8..e109da4 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -669,14 +669,14 @@ static void dasd_profile_end(struct dasd_block *block, * memory and 2) dasd_smalloc_request uses the static ccw memory * that gets allocated for each device. */ -struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, +struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, int datasize, struct dasd_device *device) { struct dasd_ccw_req *cqr; /* Sanity checks */ - BUG_ON( magic == NULL || datasize > PAGE_SIZE || + BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); @@ -700,14 +700,13 @@ struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, return ERR_PTR(-ENOMEM); } } - strncpy((char *) &cqr->magic, magic, 4); - ASCEBC((char *) &cqr->magic, 4); + cqr->magic = magic; set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); dasd_get_device(device); return cqr; } -struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, +struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize, struct dasd_device *device) { @@ -717,7 +716,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, int size; /* Sanity checks */ - BUG_ON( magic == NULL || datasize > PAGE_SIZE || + BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; @@ -744,8 +743,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, cqr->data = data; memset(cqr->data, 0, datasize); } - strncpy((char *) &cqr->magic, magic, 4); - ASCEBC((char *) &cqr->magic, 4); + cqr->magic = magic; set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); dasd_get_device(device); return cqr; @@ -899,9 +897,6 @@ int dasd_start_IO(struct dasd_ccw_req *cqr) switch (rc) { case 0: cqr->status = DASD_CQR_IN_IO; - DBF_DEV_EVENT(DBF_DEBUG, device, - "start_IO: request %p started successful", - cqr); break; case -EBUSY: DBF_DEV_EVENT(DBF_DEBUG, device, "%s", @@ -2533,7 +2528,7 @@ EXPORT_SYMBOL_GPL(dasd_generic_restore_device); static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, void *rdc_buffer, int rdc_buffer_size, - char *magic) + int magic) { struct dasd_ccw_req *cqr; struct ccw1 *ccw; @@ -2564,7 +2559,7 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, } -int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, +int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, void *rdc_buffer, int rdc_buffer_size) { int ret; |