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| author | Arjan van de Ven <arjan@infradead.org> | 2006-01-06 09:46:02 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2006-01-06 09:46:02 +0100 |
| commit | 64100099ed22f71cce656c5c2caecf5c9cf255dc (patch) | |
| tree | f6ebf7c94ee2eeb080d25880ffca839ec39ec47e | |
| parent | 80cfd548eed68cf90c5ae9cfcd6b02230cece756 (diff) | |
| download | linux-3.10-64100099ed22f71cce656c5c2caecf5c9cf255dc.tar.gz linux-3.10-64100099ed22f71cce656c5c2caecf5c9cf255dc.tar.bz2 linux-3.10-64100099ed22f71cce656c5c2caecf5c9cf255dc.zip | |
[BLOCK] mark some block/ variables cons
the patch below marks various read-only variables in block/* as const,
so that gcc can optimize the use of them; eg gcc will replace the use by
the value directly now and will even remove the memory usage of these.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Jens Axboe <axboe@suse.de>
| -rw-r--r-- | block/cfq-iosched.c | 16 | ||||
| -rw-r--r-- | block/deadline-iosched.c | 8 | ||||
| -rw-r--r-- | block/ll_rw_blk.c | 2 | ||||
| -rw-r--r-- | block/scsi_ioctl.c | 2 |
4 files changed, 14 insertions, 14 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index ee0bb41694b..74fae2daf87 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -25,15 +25,15 @@ /* * tunables */ -static int cfq_quantum = 4; /* max queue in one round of service */ -static int cfq_queued = 8; /* minimum rq allocate limit per-queue*/ -static int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; -static int cfq_back_max = 16 * 1024; /* maximum backwards seek, in KiB */ -static int cfq_back_penalty = 2; /* penalty of a backwards seek */ +static const int cfq_quantum = 4; /* max queue in one round of service */ +static const int cfq_queued = 8; /* minimum rq allocate limit per-queue*/ +static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; +static const int cfq_back_max = 16 * 1024; /* maximum backwards seek, in KiB */ +static const int cfq_back_penalty = 2; /* penalty of a backwards seek */ -static int cfq_slice_sync = HZ / 10; +static const int cfq_slice_sync = HZ / 10; static int cfq_slice_async = HZ / 25; -static int cfq_slice_async_rq = 2; +static const int cfq_slice_async_rq = 2; static int cfq_slice_idle = HZ / 100; #define CFQ_IDLE_GRACE (HZ / 10) @@ -45,7 +45,7 @@ static int cfq_slice_idle = HZ / 100; /* * disable queueing at the driver/hardware level */ -static int cfq_max_depth = 2; +static const int cfq_max_depth = 2; /* * for the hash of cfqq inside the cfqd diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c index 9cbec09e841..27e494b1bf9 100644 --- a/block/deadline-iosched.c +++ b/block/deadline-iosched.c @@ -19,10 +19,10 @@ /* * See Documentation/block/deadline-iosched.txt */ -static int read_expire = HZ / 2; /* max time before a read is submitted. */ -static int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */ -static int writes_starved = 2; /* max times reads can starve a write */ -static int fifo_batch = 16; /* # of sequential requests treated as one +static const int read_expire = HZ / 2; /* max time before a read is submitted. */ +static const int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */ +static const int writes_starved = 2; /* max times reads can starve a write */ +static const int fifo_batch = 16; /* # of sequential requests treated as one by the above parameters. For throughput. */ static const int deadline_hash_shift = 5; diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 97f4e7ecedf..e02c88ca8fb 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -1039,7 +1039,7 @@ void blk_queue_invalidate_tags(request_queue_t *q) EXPORT_SYMBOL(blk_queue_invalidate_tags); -static char *rq_flags[] = { +static const char * const rq_flags[] = { "REQ_RW", "REQ_FAILFAST", "REQ_SORTED", diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 1d8852f7bbf..c2ac36dfe4f 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -46,7 +46,7 @@ EXPORT_SYMBOL(scsi_command_size); static int sg_get_version(int __user *p) { - static int sg_version_num = 30527; + static const int sg_version_num = 30527; return put_user(sg_version_num, p); } |