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Date: Wed, 23 Aug 2006 14:20:37 +0400 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Jari Sundell <sundell.software@...il.com> Cc: David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru, nmiell@...cast.net, linux-kernel@...r.kernel.org, drepper@...hat.com, akpm@...l.org, netdev@...r.kernel.org, zach.brown@...cle.com, hch@...radead.org Subject: Re: [take12 0/3] kevent: Generic event handling mechanism. On Wed, Aug 23, 2006 at 11:49:22AM +0200, Jari Sundell (sundell.software@...il.com) wrote: > >> Only void * I'm seeing belongs to the user, (udata) perhaps you are > >> talking of something different? > > > >Yes, exactly about it. > > > >I put union { > > u32 a[2]; > > void *b; > >} > >epcially to eliminate that problem. > > It's just random data of a known maximum size appended to the struct, > I'm sure you can find a clean way to handle it. If you mangle the > first variable name in your union, you'll end up with something that > should be usable instead of udata. If there will be usual pointer, size of the whole structure will be different in kernel and userspace. > >And I'm not that sure aboit stuff like uptr_t or how they call pointers > >in userspace and kernelspace. > > Well, I can't find any use of pointers in your struct ukevent, nor in > any of the kqueue events in my man page. So if this is a deficit it > applies to both, I guess? No, it will change sizes of the structure in kernelspace and userspace, so they just can not communicate. > >ukevent is aligned to 8 bytes already (it's size selected to be 40 bytes), > >so it should not be a problem. > > > >> Eric > > Even if it is so, wouldn't it be better to be explicit about it? Ok, I will add a comment about it. > Rakshasa -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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