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Date: Fri, 3 Aug 2012 15:36:34 -0700 From: Tejun Heo <tj@...nel.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Sasha Levin <levinsasha928@...il.com>, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, paul.gortmaker@...driver.com, davem@...emloft.net, rostedt@...dmis.org, mingo@...e.hu, ebiederm@...ssion.com, aarcange@...hat.com, ericvh@...il.com, netdev@...r.kernel.org Subject: Re: [RFC v2 1/7] hashtable: introduce a small and naive hashtable On Fri, Aug 03, 2012 at 03:29:10PM -0700, Linus Torvalds wrote: > On Fri, Aug 3, 2012 at 3:23 PM, Tejun Heo <tj@...nel.org> wrote: > > > > I actually meant an enclosing struct. When you're defining a struct > > member, simply putting the storage after a struct with var array > > should be good enough. If that doesn't work, quite a few things in > > the kernel will break. > > The unsigned member of a struct has to be the last one, so your struct > won't work. I suppose you mean unsized. I remember this working. Maybe I'm confusing it with zero-sized array. Hmm... gcc doesn't complain about the following. --std=c99 seems happy too. #include <stdio.h> struct A { int i; long ar[]; }; struct B { struct A a; long ar_storage[32]; }; int main(void) { printf("sizeof(A)=%zd sizeof(B)=%zd\n", sizeof(struct A), sizeof(struct B)); return 0; } $ ./a.out sizeof(A)=8 sizeof(B)=264 -- tejun -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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