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| author | Sven Schnelle <svens@linux.ibm.com> | 2020-12-01 15:27:55 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-12-02 15:07:58 +0100 |
| commit | c6156e1da633f241e132eaea3b676d674376d770 (patch) | |
| tree | c3d78a19a518c4e3358f1949306be1494b55d793 /kernel/entry | |
| parent | 310de1a678b2184c078c593dae343cb79c807f8d (diff) | |
| download | linux-c6156e1da633f241e132eaea3b676d674376d770.tar.bz2 | |
entry: Add syscall_exit_to_user_mode_work()
This is the same as syscall_exit_to_user_mode() but without calling
exit_to_user_mode(). This can be used if there is an architectural reason
to avoid the combo function, e.g. restarting a syscall without returning to
userspace. Before returning to user space the caller has to invoke
exit_to_user_mode().
[ tglx: Amended comments ]
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201201142755.31931-6-svens@linux.ibm.com
Diffstat (limited to 'kernel/entry')
| -rw-r--r-- | kernel/entry/common.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c index 48d30ce2e00e..d6b73937dab3 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -282,12 +282,22 @@ static void syscall_exit_to_user_mode_prepare(struct pt_regs *regs) syscall_exit_work(regs, work); } -__visible noinstr void syscall_exit_to_user_mode(struct pt_regs *regs) +static __always_inline void __syscall_exit_to_user_mode_work(struct pt_regs *regs) { - instrumentation_begin(); syscall_exit_to_user_mode_prepare(regs); local_irq_disable_exit_to_user(); exit_to_user_mode_prepare(regs); +} + +void syscall_exit_to_user_mode_work(struct pt_regs *regs) +{ + __syscall_exit_to_user_mode_work(regs); +} + +__visible noinstr void syscall_exit_to_user_mode(struct pt_regs *regs) +{ + instrumentation_begin(); + __syscall_exit_to_user_mode_work(regs); instrumentation_end(); __exit_to_user_mode(); } |