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| author | Gabriel Krisman Bertazi <krisman@collabora.com> | 2020-11-16 12:41:59 -0500 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-11-16 21:53:15 +0100 |
| commit | b86678cf0f1d76062aa964c5f0c6c89fe5a6dcfd (patch) | |
| tree | 133d9a75a84153a50733fbef55517eb84ea53210 /kernel/entry | |
| parent | 3136b93c3fb2b7c19e853e049203ff8f2b9dd2cd (diff) | |
| download | lwn-b86678cf0f1d76062aa964c5f0c6c89fe5a6dcfd.tar.gz lwn-b86678cf0f1d76062aa964c5f0c6c89fe5a6dcfd.zip | |
entry: Wire up syscall_work in common entry code
Prepare the common entry code to use the SYSCALL_WORK flags. They will
be defined in subsequent patches for each type of syscall
work. SYSCALL_WORK_ENTRY/EXIT are defined for the transition, as they
will replace the TIF_ equivalent defines.
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20201116174206.2639648-4-krisman@collabora.com
Diffstat (limited to 'kernel/entry')
| -rw-r--r-- | kernel/entry/common.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c index fa17baadf63e..e7a11e38daba 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -42,7 +42,7 @@ static inline void syscall_enter_audit(struct pt_regs *regs, long syscall) } static long syscall_trace_enter(struct pt_regs *regs, long syscall, - unsigned long ti_work) + unsigned long ti_work, unsigned long work) { long ret = 0; @@ -74,11 +74,12 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall, static __always_inline long __syscall_enter_from_user_work(struct pt_regs *regs, long syscall) { + unsigned long work = READ_ONCE(current_thread_info()->syscall_work); unsigned long ti_work; ti_work = READ_ONCE(current_thread_info()->flags); - if (ti_work & SYSCALL_ENTER_WORK) - syscall = syscall_trace_enter(regs, syscall, ti_work); + if (work & SYSCALL_WORK_ENTER || ti_work & SYSCALL_ENTER_WORK) + syscall = syscall_trace_enter(regs, syscall, ti_work, work); return syscall; } @@ -225,7 +226,8 @@ static inline bool report_single_step(unsigned long ti_work) } #endif -static void syscall_exit_work(struct pt_regs *regs, unsigned long ti_work) +static void syscall_exit_work(struct pt_regs *regs, unsigned long ti_work, + unsigned long work) { bool step; @@ -245,6 +247,7 @@ static void syscall_exit_work(struct pt_regs *regs, unsigned long ti_work) */ static void syscall_exit_to_user_mode_prepare(struct pt_regs *regs) { + unsigned long work = READ_ONCE(current_thread_info()->syscall_work); u32 cached_flags = READ_ONCE(current_thread_info()->flags); unsigned long nr = syscall_get_nr(current, regs); @@ -262,8 +265,8 @@ static void syscall_exit_to_user_mode_prepare(struct pt_regs *regs) * enabled, we want to run them exactly once per syscall exit with * interrupts enabled. */ - if (unlikely(cached_flags & SYSCALL_EXIT_WORK)) - syscall_exit_work(regs, cached_flags); + if (unlikely(work & SYSCALL_WORK_EXIT || cached_flags & SYSCALL_EXIT_WORK)) + syscall_exit_work(regs, cached_flags, work); } __visible noinstr void syscall_exit_to_user_mode(struct pt_regs *regs) |