linux-kernel - Re: [PATCH] powerpc/uaccess: Don't set KUAP by default on book3s/32

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Date:   Tue,  9 Jun 2020 15:28:40 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/uaccess: Don't set KUAP by default on book3s/32

On Wed, 15 Apr 2020 14:57:09 +0000 (UTC), Christophe Leroy wrote:
> On book3s/32, KUAP is an heavy process as it requires to
> determine which segments are impacted and unlock/lock
> each of them.
> 
> And since the implementation of user_access_begin/end, it
> is even worth for the time being because unlike __get_user(),
> user_access_begin doesn't make difference between read and write
> and unlocks access also for read allthought that's unneeded
> on book3s/32.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/uaccess: Don't set KUAP by default on book3s/32
      https://git.kernel.org/powerpc/c/547e687b2981a115814962506068873d24983af7

cheers