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Date:   Tue, 15 Jun 2021 07:52:34 +0100
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>,
        linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/7] signal: Add unsafe_copy_siginfo_to_user()
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References: <b813c1f4d3dab2f51300eac44d99029aa8e57830.1623739212.git.christophe.leroy@csgroup.eu>
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On Tue, Jun 15, 2021 at 06:41:01AM +0000, Christophe Leroy wrote:
> +	unsafe_copy_to_user(__ucs_to, __ucs_from,			\
> +			    sizeof(struct kernel_siginfo), label);	\
> +	unsafe_clear_user(__ucs_expansion, SI_EXPANSION_SIZE, label);	\
> +} while (0)

unsafe_clear_user does not exist at this point, and even your later
patch only adds it for powerpc.