Re: select(0, ..) is valid ?
From: Anton Blanchard
Date: Wed May 16 2007 - 11:39:53 EST
Hi Hugh,
> It's interesting that compat_core_sys_select() shows this kmalloc(0)
> failure but core_sys_select() does not. That's because core_sys_select()
> avoids kmalloc by using a buffer on the stack for small allocations (and
> 0 sure is small). Shouldn't compat_core_sys_select() do just the same?
> Or is SLUB going to be so efficient that doing so is a waste of time?
Nice catch, the original optimisation from Andi is:
http://git.kernel.org/git-new/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=70674f95c0a2ea694d5c39f4e514f538a09be36f
And I think it makes sense for the compat code to do it too.
Anton
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