linux-kernel - Re: [PATCH 5/7] signal: Add unsafe_copy_siginfo_to

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Date:   Tue, 15 Jun 2021 07:52:34 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] signal: Add unsafe_copy_siginfo_to_user()

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.