linux-kernel - Re: [PATCH 1/2] powerpc/vdso: Add a page for non-time data

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Message-Id: <173096894627.18315.733580033753983197.b4-ty@ellerman.id.au>
Date: Thu, 07 Nov 2024 19:42:26 +1100
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, Naveen N Rao <naveen@...nel.org>, Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Jason@...c4.com
Subject: Re: [PATCH 1/2] powerpc/vdso: Add a page for non-time data

On Wed, 02 Oct 2024 10:39:28 +0200, Christophe Leroy wrote:
> The page containing VDSO time data is swapped with the one containing
> TIME namespace data when a process uses a non-root time namespace.
> For other data like powerpc specific data and RNG data, it means
> tracking whether time namespace is the root one or not to know which
> page to use.
> 
> Simplify the logic behind by moving time data out of first data page
> so that the first data page which contains everything else always
> remains the first page. Time data is in the second or third page
> depending on selected time namespace.
> 
> [...]

Applied to powerpc/next.

[1/2] powerpc/vdso: Add a page for non-time data
      https://git.kernel.org/powerpc/c/c39b1dcf055d420a498d1047c645b776e4d1a7aa
[2/2] powerpc/vdso: Implement __arch_get_vdso_rng_data()
      https://git.kernel.org/powerpc/c/4e3fa1aecb2c1f128f7289272fe2947e4396f1ce

cheers