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Message-Id: <200709290152.12842.arnd@arndb.de> Date: Sat, 29 Sep 2007 01:52:12 +0200 From: Arnd Bergmann <arnd@...db.de> To: Kyle McMartin <kyle@...artin.ca> Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [COMPAT] Add compat_merge64 helper On Saturday 29 September 2007, Kyle McMartin wrote: > > On Sat, Sep 29, 2007 at 01:38:23AM +0200, Arnd Bergmann wrote: > > 1. Byte order matches the order in which 64 bit arguments are split > > in system call conventions on all platforms. > > I checked powerpc, sparc, and mips, which are (besides parisc) the only > 64-bit with 32-bit userspace big endian architectures that I could think > of offhand. A quick grep shows sh64 too... Paul? > s390 is big-endian as well, and while it does have really weird C calling conventions for 64 bit arguments in 32 bit mode, these do not affect the system call ABI, so we should be fine here. ia64 and x86_64 are obviously little-endian, and I double-checked that they work with this logic. Arnd <>< - 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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