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Date:   Tue, 15 Dec 2020 21:48:54 +1100 (AEDT)
From:   Michael Ellerman <>
To:     Christophe Leroy <>,
        Benjamin Herrenschmidt <>,
        Paul Mackerras <>,
        Michael Ellerman <>
Subject: Re: [PATCH] powerpc/32s: Handle PROTFAULT in hash_page() also for CONFIG_PPC_KUAP

On Mon, 16 Nov 2020 16:09:31 +0000 (UTC), Christophe Leroy wrote:
> On hash 32 bits, handling minor protection faults like unsetting
> dirty flag is heavy if done from the normal page_fault processing,
> because it implies hash table software lookup for flushing the entry
> and then a DSI is taken anyway to add the entry back.
> When KUAP was implemented, as explained in commit a68c31fc01ef
> ("powerpc/32s: Implement Kernel Userspace Access Protection"),
> protection faults has been diverted from hash_page() because
> hash_page() was not able to identify a KUAP fault.
> [...]

Applied to powerpc/next.

[1/1] powerpc/32s: Handle PROTFAULT in hash_page() also for CONFIG_PPC_KUAP


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