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

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Date:	Wed, 12 Dec 2012 22:47:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefani Seibold <stefani@...bold.net>
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

Should be a simple matter of sharing pages.  Look perhaps at the x32 vdso for a hint.

Stefani Seibold <stefani@...bold.net> wrote:

>Am Mittwoch, den 12.12.2012, 22:14 -0800 schrieb H. Peter Anvin:
>> This is too late for 3.8 anyway, so there is time to make it work
>correctly before tge 3.9 merge window anyway.  After this merge window
>is over I may pull tjis into a testing branch, but compat support is a
>precondition.
>> 
>> The vdso is only optional if you build in backwards compatibility
>anyway, and software has a right to expect a specific numeric kernel
>version to export a single ABI.
>> 
>
>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.
>
>- Stefani

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