linux-kernel - Re: [PATCH] Add VDSO time function support for x86 32-bit kernel

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Date:	Thu, 13 Dec 2012 08:17:18 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, ak@...ux.intel.com, aarcange@...hat.com,
	john.stultz@...aro.org, luto@...capital.net
Subject: Re: [PATCH] Add VDSO time function support for x86 32-bit kernel

Am Mittwoch, den 12.12.2012, 22:47 -0800 schrieb H. Peter Anvin:
> Should be a simple matter of sharing pages.  Look perhaps at the x32 vdso for a hint.
> 


> >
> >Any idea or clean solution how i can map the 64 bit vgtod into the 32
> >bit address space? Thats the only problem i see.
> >

No, i see no special handling for x32 vdso to do this. I am not sure if
x32 vdso can access the 64 bit address space of vsyscall_gtod_data. I
can't test this due the lack of a x32 abi system.


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