Re: [Patch] Do not copy from remote while in_atomic()

On Thu, Mar 23, 2006 at 11:37:44AM +0100, Ansgar Esztermann wrote:
> Here is a patch for CONFIG_HIGHMEM enabled kernels.
>
> Some kernel functions use kmap_atomic() rather than kmap() to map a
> page before copying data from user space. While this is faster, atomic
> maps pose a problem with OpenMosix: deputy_copy_from_user() has to
> get the data over the network; the network code in turn might
> reschedule, which will lead to a "scheduling while atomic" error
> message. Worse, the copied data may be corrupted.
> One of the functions affected is the write() system call.
>
> The following patch makes deputy_copy_*_user() fail gracefully in this
> case. The calling function then has the opportunity to retry the
> operation using non-atomic maps instead.

Applied, Thanks.

-- 
Vincent Hanquez


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