block: add blk-iopoll, a NAPI like approach for block devices

[~andy/linux] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 58be76017fd000f3b019c0acab6d3cdeb672afda..0ed9fa6f322ee72c1d381fadf197a0a0cc41ff64 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -92,6 +92,7 @@ extern int sysctl_nr_trim_pages;
 #ifdef CONFIG_RCU_TORTURE_TEST
 extern int rcutorture_runnable;
 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
+extern int blk_iopoll_enabled;
 
 /* Constants used for minimum and  maximum */
 #ifdef CONFIG_DETECT_SOFTLOCKUP
@@ -990,7 +991,14 @@ static struct ctl_table kern_table[] = {
                .proc_handler   = &proc_dointvec,
        },
 #endif
-
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "blk_iopoll",
+               .data           = &blk_iopoll_enabled,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec,
+       },
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt