[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>
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 1d8852f..c2ac36d 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -46,7 +46,7 @@
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);
}