Messages in this thread | | | Date | Fri, 17 Dec 1999 17:11:57 -0500 | From | "Rafael E. Herrera" <> | Subject | Help with SMP aware modules. |
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Hello,
I'm porting a driver for a DAC board from 2.0 to 2.2. Since I'm learning kernel programming as I do this, I have some questions about how to make this driver SMP aware.
After reading this article, http://news.tucows.com/ext2/99/11/articles/ext2112919991.shtml, I was left wondering about when to use the spinlocks.
A piece of code like this:
for (i=0;i<count;i++) outb(*buf++, addr);
should be protected in all SMP instances? As in:
spin_lock(&lock); for (i=0;i<count;i++) outb(*buf++, addr); spin_unlock(&lock);
How about:
for (i=0;i<count;i++) *dest++ = inb(addr);
should a spinlock be placed here too?
Thanks. -- Rafael Herrera Laboratory for Computational Neuroscience University of Pittsburgh http://www.neuronet.pitt.edu/~raffo
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