Chris Wedgwood wrote:
On Wed, May 04, 2005 at 11:46:18AM -0300, Andr? Pereira de Almeida wrote:
- if (tsk->clear_child_tid && atomic_read(&mm->mm_users) > 1) {
+ if (mm && tsk->clear_child_tid && atomic_read(&mm->mm_users) > 1) {
did you actually see a problem here?
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In a preemptible kernel with the serport module and a serial port try to
run the following program:
int main(int argc, char **argv)
{
int ldisc,fd;
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NONBLOCK);
ldisc = N_MOUSE;
ioctl(fd, TIOCSETD, &ldisc);
read(fd, NULL, 0);
return 0;
}
and kill it.
In my case it will hang the computer. I think this is a problem with the
serport module. With this patch, the serial mouse stop working, but the
computer don't hang.
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