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| author | Sven Schnelle <svens@linux.ibm.com> | 2020-12-01 15:27:54 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-12-02 15:07:57 +0100 |
| commit | 310de1a678b2184c078c593dae343cb79c807f8d (patch) | |
| tree | e3068fff603e0bd1f607deb8aeb55644bd12816b /kernel/entry/common.c | |
| parent | 96e2fbccd0fc806364a964fdf072bfc858a66109 (diff) | |
| download | lwn-310de1a678b2184c078c593dae343cb79c807f8d.tar.gz lwn-310de1a678b2184c078c593dae343cb79c807f8d.zip | |
entry: Add exit_to_user_mode() wrapper
Called from architecture specific code when syscall_exit_to_user_mode() is
not suitable. It simply calls __exit_to_user_mode().
This way __exit_to_user_mode() can still be inlined because it is declared
static __always_inline.
[ tglx: Amended comments and moved it to a different place in the header ]
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201201142755.31931-5-svens@linux.ibm.com
Diffstat (limited to 'kernel/entry/common.c')
| -rw-r--r-- | kernel/entry/common.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c index 17b1e032afe7..48d30ce2e00e 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -117,18 +117,7 @@ noinstr void syscall_enter_from_user_mode_prepare(struct pt_regs *regs) instrumentation_end(); } -/** - * __exit_to_user_mode - Fixup state when exiting to user mode - * - * Syscall/interupt exit enables interrupts, but the kernel state is - * interrupts disabled when this is invoked. Also tell RCU about it. - * - * 1) Trace interrupts on state - * 2) Invoke context tracking if enabled to adjust RCU state - * 3) Invoke architecture specific last minute exit code, e.g. speculation - * mitigations, etc. - * 4) Tell lockdep that interrupts are enabled - */ +/* See comment for exit_to_user_mode() in entry-common.h */ static __always_inline void __exit_to_user_mode(void) { instrumentation_begin(); @@ -141,6 +130,11 @@ static __always_inline void __exit_to_user_mode(void) lockdep_hardirqs_on(CALLER_ADDR0); } +void noinstr exit_to_user_mode(void) +{ + __exit_to_user_mode(); +} + /* Workaround to allow gradual conversion of architecture code */ void __weak arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal) { } |