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entry: Move syscall_enter_from_user_mode() to header file

Browse source 
To allow inlining of syscall_enter_from_user_mode(), move it
to entry-common.h.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20231218074520.1998026-4-svens@linux.ibm.com
This commit is contained in:
Sven Schnelle 2023-12-18 08:45:20 +01:00 committed by Thomas Gleixner
parent caf4062e35
commit 221a164035
2 changed files with 26 additions and 33 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

27
include/linux/entry-common.h
View file

@ -134,6 +134,9 @@ static __always_inline void enter_from_user_mode(struct pt_regs *regs)
*/
void syscall_enter_from_user_mode_prepare(struct pt_regs *regs);
long syscall_trace_enter(struct pt_regs *regs, long syscall,
unsigned long work);
/**
* syscall_enter_from_user_mode_work - Check and handle work before invoking
* a syscall
@ -157,7 +160,15 @@ void syscall_enter_from_user_mode_prepare(struct pt_regs *regs);
* ptrace_report_syscall_entry(), __secure_computing(), trace_sys_enter()
* 2) Invocation of audit_syscall_entry()
*/
long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall);
static __always_inline long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall)
{
unsigned long work = READ_ONCE(current_thread_info()->syscall_work);
if (work & SYSCALL_WORK_ENTER)
syscall = syscall_trace_enter(regs, syscall, work);
return syscall;
}
/**
* syscall_enter_from_user_mode - Establish state and check and handle work
@ -176,7 +187,19 @@ long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall);
* 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);
static __always_inline long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall)
{
long ret;
enter_from_user_mode(regs);
instrumentation_begin();
local_irq_enable();
ret = syscall_enter_from_user_mode_work(regs, syscall);
instrumentation_end();
return ret;
}
/**
* local_irq_enable_exit_to_user - Exit to user variant of local_irq_enable()

32
kernel/entry/common.c
View file

@ -25,7 +25,7 @@ static inline void syscall_enter_audit(struct pt_regs *regs, long syscall)
}
}
static long syscall_trace_enter(struct pt_regs *regs, long syscall,
long syscall_trace_enter(struct pt_regs *regs, long syscall,
unsigned long work)
{
long ret = 0;
@ -65,36 +65,6 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
return ret ? : 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);
if (work & SYSCALL_WORK_ENTER)
syscall = syscall_trace_enter(regs, syscall, work);
return syscall;
}
long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall)
{
return __syscall_enter_from_user_work(regs, syscall);
}
noinstr long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall)
{
long ret;
enter_from_user_mode(regs);
instrumentation_begin();
local_irq_enable();
ret = __syscall_enter_from_user_work(regs, syscall);
instrumentation_end();
return ret;
}
noinstr void syscall_enter_from_user_mode_prepare(struct pt_regs *regs)
{
enter_from_user_mode(regs);