Rtc driver documentation update
* Mention the max-user-freq control file.
* Add missing header in example code.
Signed-off-by: Jean Delvare <[email protected]>
---
Documentation/rtc.txt | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- linux-2.6.17-rc5.orig/Documentation/rtc.txt 2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.17-rc5/Documentation/rtc.txt 2006-05-30 17:09:52.000000000 +0200
@@ -44,8 +44,10 @@
Programming and/or enabling interrupt frequencies greater than 64Hz is
only allowed by root. This is perhaps a bit conservative, but we don't want
an evil user generating lots of IRQs on a slow 386sx-16, where it might have
-a negative impact on performance. Note that the interrupt handler is only
-a few lines of code to minimize any possibility of this effect.
+a negative impact on performance. This 64Hz limit can be changed by writing
+a different value to /proc/sys/dev/rtc/max-user-freq. Note that the
+interrupt handler is only a few lines of code to minimize any possibility
+of this effect.
Also, if the kernel time is synchronized with an external source, the
kernel will write the time back to the CMOS clock every 11 minutes. In
@@ -81,6 +83,7 @@
*/
#include <stdio.h>
+#include <stdlib.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <sys/time.h>
--
Jean Delvare
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