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Date: Tue, 01 May 2012 10:26:27 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Jan Seiffert <kaffeemonster@...glemail.com> Cc: David Miller <davem@...emloft.net>, eric.dumazet@...il.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [REGRESSION][PATCH V4 3/3] bpf jit: Let the powerpc jit handle negative offsets On Tue, 2012-05-01 at 00:32 +0200, Jan Seiffert wrote: > *shudder* > Link to another lib for only one function because.... > > http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/net/bpf.h?rev=1.59&content-type=text/x-cvsweb-markup&only_with_tag=MAIN > The "Original" says it's an u_int. > > But i guess it is unfixable without breaking something, except with ugly code. > Should the padding at least be made explicit in the in-kernel struct? > Did anyone ever tested the 32bit on 64bit compat code (different padding)? Haven't tested no. A quick google pointed to 2 web pages telling people to do the wrong thing and 4 broken programs out there, interestingly in different ways :-) (somebody's doing a reinterpret_cast of one struct into another, somebody does his/her own local redefinition of the struct ... using a ulong !, etc....) I don't see a good way to sort that out other than introducing a new kernel-side structure, change the sockopt number, and support the old one as backward binary compat, but that's gross. Cheers, Ben. -- 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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