enable the common entry of user return notifier for powerpc as
a debug feature.
Signed-off-by Luming Yu <luming...@shingroup.cn>
---
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 261c9116d6fa..9a1e6669fa24 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
+
+#endif
diff --git a/arch/powerpc/include/asm/thread_info.h
b/arch/powerpc/include/asm/thread_info.h
index 9df2bcf28544..c52ca3aaebb5 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -118,6 +118,7 @@ void arch_setup_new_exec(void);
#endif
#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_32BIT 20 /* 32 bit binary */
+#define TIF_USER_RETURN_NOTIFY 21 /* notify kernel of userspace return */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -126,6 +127,7 @@ void arch_setup_new_exec(void);
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_32BIT (1<<TIF_32BIT)
+#define _TIF_USER_RETURN_NOTIFY (1<<TIF_USER_RETURN_NOTIFY)
#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 392404688cec..70a9ea949798 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -38,6 +38,7 @@
#include <linux/uaccess.h>
#include <linux/pkeys.h>
#include <linux/seq_buf.h>
+#include <linux/user-return-notifier.h>
#include <asm/interrupt.h>
#include <asm/io.h>
@@ -1386,6 +1387,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
if (current->thread.regs)
restore_math(current->thread.regs);
#endif /* CONFIG_PPC_BOOK3S_64 */
+ propagate_user_return_notify(prev, new);
return last;
}
--
2.42.0.windows.2
