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Merge branch 'core/urgent' into core/entry

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Pick up the entry fix before further modifications.
This commit is contained in:
Thomas Gleixner 2020-11-04 18:14:52 +01:00
commit 01be83eea0
15211 changed files with 584875 additions and 313540 deletions
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53
include/linux/entry-common.h
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@ -42,7 +42,7 @@
#endif
/*
* TIF flags handled in syscall_enter_from_usermode()
* TIF flags handled in syscall_enter_from_user_mode()
*/
#ifndef ARCH_SYSCALL_ENTER_WORK
# define ARCH_SYSCALL_ENTER_WORK (0)
@ -114,15 +114,30 @@ static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs
#endif
/**
* syscall_enter_from_user_mode - Check and handle work before invoking
* a syscall
* syscall_enter_from_user_mode_prepare - Establish state and enable interrupts
* @regs: Pointer to currents pt_regs
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct, interrupts are enabled and the
* subsequent functions can be instrumented.
*
* This handles lockdep, RCU (context tracking) and tracing state.
*
* This is invoked when there is extra architecture specific functionality
* to be done between establishing state and handling user mode entry work.
*/
void syscall_enter_from_user_mode_prepare(struct pt_regs *regs);
/**
* syscall_enter_from_user_mode_work - Check and handle work before invoking
* a syscall
* @regs: Pointer to currents pt_regs
* @syscall: The syscall number
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct and the subsequent functions can be
* instrumented.
* enabled after invoking syscall_enter_from_user_mode_prepare() and extra
* architecture specific work.
*
* Returns: The original or a modified syscall number
*
@ -131,12 +146,30 @@ static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs
* syscall_set_return_value() first. If neither of those are called and -1
* is returned, then the syscall will fail with ENOSYS.
*
* The following functionality is handled here:
* It handles the following work items:
*
* 1) Establish state (lockdep, RCU (context tracking), tracing)
* 2) TIF flag dependent invocations of arch_syscall_enter_tracehook(),
* 1) TIF flag dependent invocations of arch_syscall_enter_tracehook(),
* __secure_computing(), trace_sys_enter()
* 3) Invocation of audit_syscall_entry()
* 2) Invocation of audit_syscall_entry()
*/
long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall);
/**
* syscall_enter_from_user_mode - Establish state and check and handle work
* before invoking a syscall
* @regs: Pointer to currents pt_regs
* @syscall: The syscall number
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct, interrupts are enabled and the
* subsequent functions can be instrumented.
*
* This is combination of syscall_enter_from_user_mode_prepare() and
* syscall_enter_from_user_mode_work().
*
* Returns: The original or a modified syscall number. See
* syscall_enter_from_user_mode_work() for further explanation.
*/
long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall);