Luming Yu <luming...@shingroup.cn> writes:
> The support for user return notifier infrastructure
> is hooked into powerpc architecture.
> ---
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/include/asm/entry-common.h | 16 ++++++++++++++++
> arch/powerpc/include/asm/thread_info.h | 2 ++
> arch/powerpc/kernel/process.c | 2 ++
> 4 files changed, 21 insertions(+)
> create mode 100644 arch/powerpc/include/asm/entry-common.h
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index c10229c0243c..b968068cc04a 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -277,6 +277,7 @@ config PPC
> select HAVE_STACKPROTECTOR if PPC64 &&
> $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
> select HAVE_STATIC_CALL if PPC32
> select HAVE_SYSCALL_TRACEPOINTS
> + select HAVE_USER_RETURN_NOTIFIER
> select HAVE_VIRT_CPU_ACCOUNTING
> select HAVE_VIRT_CPU_ACCOUNTING_GEN
> select HOTPLUG_SMT if HOTPLUG_CPU
> diff --git a/arch/powerpc/include/asm/entry-common.h
> b/arch/powerpc/include/asm/entry-common.h
> new file mode 100644
> index 000000000000..51f1eb767696
> --- /dev/null
> +++ b/arch/powerpc/include/asm/entry-common.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef ARCH_POWERPC_ENTRY_COMMON_H
> +#define ARCH_POWERPC_ENTRY_COMMON_H
> +
> +#include <linux/user-return-notifier.h>
> +
> +static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
> + unsigned long ti_work)
> +{
> + if (ti_work & _TIF_USER_RETURN_NOTIFY)
> + fire_user_return_notifiers();
> +}
> +
> +#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
AFAICS this is never called because we don't use CONFIG_GENERIC_ENTRY ?
cheers
