Messages in this thread | | | From | "David A. Schleef" <> | Subject | Trouble with do_gettimeofday() | Date | Wed, 15 May 1996 15:06:25 -0500 (EST) |
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I am using 1.3.100 as a base for writing a driver for several data acquisition boards. While testing, I noticed that do_gettimeofday() in arch/i381/kernel/time.c is not monotonic when called from an interrupt.
Specifically, it seems as though do_slow_gettimeoffset() returns the wrong value during the period between the timer interrupt and when update_wall_timer_one_tick() updates xtime.tv_usec in kernel/sched.c. Obviously, since sys_gettimeofday() does not call do_gettimeofday() during this period, the system call is not affected. However, several drivers call do_gettimeofday(), possibly some in interrupts (as mine does).
Is it better to simply say "don't call do_gettimeofday() from interrupts?"
dave...
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