Re: [PATCH 5/7] signal: Add unsafe_copy_siginfo_to_user()

[Christoph Hellwig]

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.