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From: Christoph Hellwig <hch@infradead.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/7] powerpc/uaccess: Add unsafe_clear_user()
Date: Tue, 15 Jun 2021 07:53:20 +0100	[thread overview]
Message-ID: <YMhOYKM5+s0wUoeP@infradead.org> (raw)
In-Reply-To: <67eedb69ca81e5a4b16459a4c61f99e64cb42675.1623739212.git.christophe.leroy@csgroup.eu>

On Tue, Jun 15, 2021 at 06:41:02AM +0000, Christophe Leroy wrote:
> Implement unsafe_clear_user() for powerpc.
> It's a copy/paste of unsafe_copy_to_user() with value 0 as source.
> 
> It may be improved in a later patch by using 'dcbz' instruction
> to zeroize full cache lines at once.

Please add this to common code insted of making it powerpc specific.


  reply	other threads:[~2021-06-15  6:53 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15  6:40 [PATCH 1/7] powerpc/signal64: Copy siginfo before changing regs->nip Christophe Leroy
2021-06-15  6:40 ` [PATCH 2/7] powerpc/signal64: Don't read sigaction arguments back from user memory Christophe Leroy
2021-06-15  6:40 ` [PATCH 3/7] powerpc/signal64: Access function descriptor with user access block Christophe Leroy
2021-06-15  6:41 ` [PATCH 4/7] powerpc/signal: Include the new stack frame inside the " Christophe Leroy
2021-06-15  6:41 ` [PATCH 5/7] signal: Add unsafe_copy_siginfo_to_user() Christophe Leroy
2021-06-15  6:52   ` Christoph Hellwig
2021-06-15  7:03     ` Christophe Leroy
2021-06-15  7:21       ` Christoph Hellwig
2021-06-15  7:28         ` Christophe Leroy
2021-06-15  6:41 ` [PATCH 6/7] powerpc/uaccess: Add unsafe_clear_user() Christophe Leroy
2021-06-15  6:53   ` Christoph Hellwig [this message]
2021-06-15  7:10     ` Christophe Leroy
2021-06-15  6:41 ` [PATCH 7/7] powerpc/signal: Use unsafe_copy_siginfo_to_user() Christophe Leroy
2021-06-15  6:55   ` Christoph Hellwig
2021-06-15  7:00     ` Christophe Leroy

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