Re: question on SMP and read()/write()

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Sat Oct 28 2000 - 12:19:18 EDT

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> I've noticed that sys_read() and sys_write() don't grab the big kernel lock.
> As file descriptors may be shared, must device drivers provide SMP safe
> read() and write() methods ?

Yes. This is true in 2.2 as well although the inode lock provides some protection
on writes.

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