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| author |   Sven Schnelle <svens@linux.ibm.com> | 2020-12-01 15:27:53 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-12-02 15:07:57 +0100 |
| commit | 96e2fbccd0fc806364a964fdf072bfc858a66109 (patch) | |
| tree | e794e017f180e4e8578b2f97bb50e213f3910531 /kernel/entry | |
| parent | entry: Rename exit_to_user_mode() (diff) | |
| download | linux-dev-96e2fbccd0fc806364a964fdf072bfc858a66109.tar.xz linux-dev-96e2fbccd0fc806364a964fdf072bfc858a66109.zip | |
entry_Add_enter_from_user_mode_wrapper
To be called from architecture specific code if the combo interfaces are
not suitable. It simply calls __enter_from_user_mode(). This way
__enter_from_user_mode will still be inlined because it is declared static
__always_inline.
[ tglx: Amend comments and move it to a different location 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/20201201142755.31931-4-svens@linux.ibm.com
Diffstat (limited to 'kernel/entry')
| -rw-r--r-- | kernel/entry/common.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c index dff07b4ce6ec..17b1e032afe7 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -10,16 +10,7 @@ #define CREATE_TRACE_POINTS #include <trace/events/syscalls.h> -/** - * __enter_from_user_mode - Establish state when coming from user mode - * - * Syscall/interrupt entry disables interrupts, but user mode is traced as - * interrupts enabled. Also with NO_HZ_FULL RCU might be idle. - * - * 1) Tell lockdep that interrupts are disabled - * 2) Invoke context tracking if enabled to reactivate RCU - * 3) Trace interrupts off state - */ +/* See comment for enter_from_user_mode() in entry-common.h */ static __always_inline void __enter_from_user_mode(struct pt_regs *regs) { arch_check_user_regs(regs); @@ -33,6 +24,11 @@ static __always_inline void __enter_from_user_mode(struct pt_regs *regs) instrumentation_end(); } +void noinstr enter_from_user_mode(struct pt_regs *regs) +{ + __enter_from_user_mode(regs); +} + static inline void syscall_enter_audit(struct pt_regs *regs, long syscall) { if (unlikely(audit_context())) { |