Date: Sat, 16 Oct 2010 12:12:43 +0200 From: Hans Petter Selasky <hselasky@freebsd.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, Andrew Thompson <thompsa@freebsd.org> Subject: Re: svn commit: r213852 - in head: lib/libusb sys/dev/usb Message-ID: <201010161212.43749.hselasky@freebsd.org> In-Reply-To: <20101016100051.GS2392@deviant.kiev.zoral.com.ua> References: <201010161141.32116.hselasky@freebsd.org> <20101016100051.GS2392@deviant.kiev.zoral.com.ua>
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On Saturday 16 October 2010 12:00:51 Kostik Belousov wrote: > > USB has some shared memory structures which are used in both user-land > > and kernel, which are not part of IOCTLs. Your approach means that > > there are two sets of IOCTL's of all kinds, one for 32-bit and one for > > 64-bit? > > For all kinds of structures that are not ABI-invariant, yes. The approach that was discussed by me and Andrew earlier this year, was to use uint64_t instead of "void *" in shared memory structures. The only disadvantage is that this will force you to recompile libusb when you update the kernel, and so we kind of put that approach aside to keep seamless upgrade compatibility. --HPS
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