Messages in this thread | | | Date | Wed, 09 Apr 2008 18:10:57 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 0/3] clone64() and unshare64() system calls |
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sukadev@us.ibm.com wrote: >> >> If you're going to make it a 64-bit pass it in as a 64-bit number, instead >> of breaking it into two numbers. > > Maybe I am missing your point. The glibc interface could take a 64bit > parameter, but don't we need to pass 32-bit values into the system call > on 32 bit systems ?
Not as such, no. The ABI handles that. To make the ABI clean on some architectures, it's good to consider a 64-bit value only in positions where they map to an even:odd register pair once slotted in.
> Yes, this was discussed before in the context of Pavel Emelyanov's patch > > http://lkml.org/lkml/2008/1/16/109 > > along with sys_indirect(). While there was no consensus, it looked like > adding a new system call was better than open ended interfaces.
That's not really an open-ended interface, it's just an expandable bitmap.
-hpa
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