From: Jean Delvare Rtc driver documentation update * Mention the max-user-freq control file. * Add missing header in example code. Signed-off-by: Jean Delvare Cc: Alessandro Zummo Signed-off-by: Andrew Morton --- Documentation/rtc.txt | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff -puN Documentation/rtc.txt~rtc-small-documentation-update Documentation/rtc.txt --- 25/Documentation/rtc.txt~rtc-small-documentation-update Wed May 31 16:11:55 2006 +++ 25-akpm/Documentation/rtc.txt Wed May 31 16:11:55 2006 @@ -44,8 +44,10 @@ normal timer interrupt, which is 100Hz. 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 @@ that will be using this driver. */ #include +#include #include #include #include _