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treewide: context_tracking: Rename CONTEXT_* into CT_STATE_*

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Context tracking state related symbols currently use a mix of the
CONTEXT_ (e.g. CONTEXT_KERNEL) and CT_SATE_ (e.g. CT_STATE_MASK) prefixes.

Clean up the naming and make the ctx_state enum use the CT_STATE_ prefix.

Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
This commit is contained in:
Valentin Schneider 2023-07-25 12:08:50 +01:00 committed by Neeraj Upadhyay
parent 8400291e28
commit d65d411c92
12 changed files with 38 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/Kconfig
View File

@ -862,7 +862,7 @@ config HAVE_CONTEXT_TRACKING_USER_OFFSTACK
Architecture neither relies on exception_enter()/exception_exit()
nor on schedule_user(). Also preempt_schedule_notrace() and
preempt_schedule_irq() can't be called in a preemptible section
while context tracking is CONTEXT_USER. This feature reflects a sane
while context tracking is CT_STATE_USER. This feature reflects a sane
entry implementation where the following requirements are met on
critical entry code, ie: before user_exit() or after user_enter():

2
arch/arm64/kernel/entry-common.c
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@ -103,7 +103,7 @@ static void noinstr exit_to_kernel_mode(struct pt_regs *regs)
static __always_inline void __enter_from_user_mode(void)
{
lockdep_hardirqs_off(CALLER_ADDR0);
CT_WARN_ON(ct_state() != CONTEXT_USER);
CT_WARN_ON(ct_state() != CT_STATE_USER);
user_exit_irqoff();
trace_hardirqs_off_finish();
mte_disable_tco_entry(current);

6
arch/powerpc/include/asm/interrupt.h
View File

@ -177,7 +177,7 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs)
if (user_mode(regs)) {
kuap_lock();
CT_WARN_ON(ct_state() != CONTEXT_USER);
CT_WARN_ON(ct_state() != CT_STATE_USER);
user_exit_irqoff();
account_cpu_user_entry();
@ -189,8 +189,8 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs)
* so avoid recursion.
*/
if (TRAP(regs) != INTERRUPT_PROGRAM)
CT_WARN_ON(ct_state() != CONTEXT_KERNEL &&
ct_state() != CONTEXT_IDLE);
CT_WARN_ON(ct_state() != CT_STATE_KERNEL &&
ct_state() != CT_STATE_IDLE);
INT_SOFT_MASK_BUG_ON(regs, is_implicit_soft_masked(regs));
INT_SOFT_MASK_BUG_ON(regs, arch_irq_disabled_regs(regs) &&
search_kernel_restart_table(regs->nip));

6
arch/powerpc/kernel/interrupt.c
View File

@ -266,7 +266,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
unsigned long ret = 0;
bool is_not_scv = !IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !scv;
CT_WARN_ON(ct_state() == CONTEXT_USER);
CT_WARN_ON(ct_state() == CT_STATE_USER);
kuap_assert_locked();
@ -344,7 +344,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs)
BUG_ON(regs_is_unrecoverable(regs));
BUG_ON(arch_irq_disabled_regs(regs));
CT_WARN_ON(ct_state() == CONTEXT_USER);
CT_WARN_ON(ct_state() == CT_STATE_USER);
/*
* We don't need to restore AMR on the way back to userspace for KUAP.
@ -386,7 +386,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
if (!IS_ENABLED(CONFIG_PPC_BOOK3E_64) &&
TRAP(regs) != INTERRUPT_PROGRAM &&
TRAP(regs) != INTERRUPT_PERFMON)
CT_WARN_ON(ct_state() == CONTEXT_USER);
CT_WARN_ON(ct_state() == CT_STATE_USER);
kuap = kuap_get_and_assert_locked();

2
arch/powerpc/kernel/syscall.c
View File

@ -27,7 +27,7 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
trace_hardirqs_off(); /* finish reconciling */
CT_WARN_ON(ct_state() == CONTEXT_KERNEL);
CT_WARN_ON(ct_state() == CT_STATE_KERNEL);
user_exit_irqoff();
BUG_ON(regs_is_unrecoverable(regs));

2
arch/x86/entry/common.c
View File

@ -150,7 +150,7 @@ early_param("ia32_emulation", ia32_emulation_override_cmdline);
#endif
/*
* Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL.
* Invoke a 32-bit syscall. Called with IRQs on in CT_STATE_KERNEL.
*/
static __always_inline void do_syscall_32_irqs_on(struct pt_regs *regs, int nr)
{

16
include/linux/context_tracking.h
View File

@ -26,26 +26,26 @@ extern void user_exit_callable(void);
static inline void user_enter(void)
{
if (context_tracking_enabled())
ct_user_enter(CONTEXT_USER);
ct_user_enter(CT_STATE_USER);
}
static inline void user_exit(void)
{
if (context_tracking_enabled())
ct_user_exit(CONTEXT_USER);
ct_user_exit(CT_STATE_USER);
}
/* Called with interrupts disabled. */
static __always_inline void user_enter_irqoff(void)
{
if (context_tracking_enabled())
__ct_user_enter(CONTEXT_USER);
__ct_user_enter(CT_STATE_USER);
}
static __always_inline void user_exit_irqoff(void)
{
if (context_tracking_enabled())
__ct_user_exit(CONTEXT_USER);
__ct_user_exit(CT_STATE_USER);
}
static inline enum ctx_state exception_enter(void)
@ -57,7 +57,7 @@ static inline enum ctx_state exception_enter(void)
return 0;
prev_ctx = __ct_state();
if (prev_ctx != CONTEXT_KERNEL)
if (prev_ctx != CT_STATE_KERNEL)
ct_user_exit(prev_ctx);
return prev_ctx;
@ -67,7 +67,7 @@ static inline void exception_exit(enum ctx_state prev_ctx)
{
if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) &&
context_tracking_enabled()) {
if (prev_ctx != CONTEXT_KERNEL)
if (prev_ctx != CT_STATE_KERNEL)
ct_user_enter(prev_ctx);
}
}
@ -75,7 +75,7 @@ static inline void exception_exit(enum ctx_state prev_ctx)
static __always_inline bool context_tracking_guest_enter(void)
{
if (context_tracking_enabled())
__ct_user_enter(CONTEXT_GUEST);
__ct_user_enter(CT_STATE_GUEST);
return context_tracking_enabled_this_cpu();
}
@ -83,7 +83,7 @@ static __always_inline bool context_tracking_guest_enter(void)
static __always_inline void context_tracking_guest_exit(void)
{
if (context_tracking_enabled())
__ct_user_exit(CONTEXT_GUEST);
__ct_user_exit(CT_STATE_GUEST);
}
#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))

20
include/linux/context_tracking_state.h
View File

@ -10,18 +10,18 @@
#define DYNTICK_IRQ_NONIDLE ((LONG_MAX / 2) + 1)
enum ctx_state {
CONTEXT_DISABLED = -1, /* returned by ct_state() if unknown */
CONTEXT_KERNEL = 0,
CONTEXT_IDLE = 1,
CONTEXT_USER = 2,
CONTEXT_GUEST = 3,
CONTEXT_MAX = 4,
CT_STATE_DISABLED = -1, /* returned by ct_state() if unknown */
CT_STATE_KERNEL = 0,
CT_STATE_IDLE = 1,
CT_STATE_USER = 2,
CT_STATE_GUEST = 3,
CT_STATE_MAX = 4,
};
/* Even value for idle, else odd. */
#define RCU_DYNTICKS_IDX CONTEXT_MAX
#define RCU_DYNTICKS_IDX CT_STATE_MAX
#define CT_STATE_MASK (CONTEXT_MAX - 1)
#define CT_STATE_MASK (CT_STATE_MAX - 1)
#define CT_DYNTICKS_MASK (~CT_STATE_MASK)
struct context_tracking {
@ -123,14 +123,14 @@ static inline bool context_tracking_enabled_this_cpu(void)
*
* Returns the current cpu's context tracking state if context tracking
* is enabled. If context tracking is disabled, returns
* CONTEXT_DISABLED. This should be used primarily for debugging.
* CT_STATE_DISABLED. This should be used primarily for debugging.
*/
static __always_inline int ct_state(void)
{
int ret;
if (!context_tracking_enabled())
return CONTEXT_DISABLED;
return CT_STATE_DISABLED;
preempt_disable();
ret = __ct_state();

2
include/linux/entry-common.h
View File

@ -108,7 +108,7 @@ static __always_inline void enter_from_user_mode(struct pt_regs *regs)
arch_enter_from_user_mode(regs);
lockdep_hardirqs_off(CALLER_ADDR0);
CT_WARN_ON(__ct_state() != CONTEXT_USER);
CT_WARN_ON(__ct_state() != CT_STATE_USER);
user_exit_irqoff();
instrumentation_begin();

12
kernel/context_tracking.c
View File

@ -317,7 +317,7 @@ void noinstr ct_nmi_enter(void)
void noinstr ct_idle_enter(void)
{
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !raw_irqs_disabled());
ct_kernel_exit(false, RCU_DYNTICKS_IDX + CONTEXT_IDLE);
ct_kernel_exit(false, RCU_DYNTICKS_IDX + CT_STATE_IDLE);
}
EXPORT_SYMBOL_GPL(ct_idle_enter);
@ -335,7 +335,7 @@ void noinstr ct_idle_exit(void)
unsigned long flags;
raw_local_irq_save(flags);
ct_kernel_enter(false, RCU_DYNTICKS_IDX - CONTEXT_IDLE);
ct_kernel_enter(false, RCU_DYNTICKS_IDX - CT_STATE_IDLE);
raw_local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(ct_idle_exit);
@ -485,7 +485,7 @@ void noinstr __ct_user_enter(enum ctx_state state)
* user_exit() or ct_irq_enter(). Let's remove RCU's dependency
* on the tick.
*/
if (state == CONTEXT_USER) {
if (state == CT_STATE_USER) {
instrumentation_begin();
trace_user_enter(0);
vtime_user_enter(current);
@ -621,7 +621,7 @@ void noinstr __ct_user_exit(enum ctx_state state)
* run a RCU read side critical section anytime.
*/
ct_kernel_enter(true, RCU_DYNTICKS_IDX - state);
if (state == CONTEXT_USER) {
if (state == CT_STATE_USER) {
instrumentation_begin();
vtime_user_exit(current);
trace_user_exit(0);
@ -634,12 +634,12 @@ void noinstr __ct_user_exit(enum ctx_state state)
* In this we case we don't care about any concurrency/ordering.
*/
if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE))
raw_atomic_set(&ct->state, CONTEXT_KERNEL);
raw_atomic_set(&ct->state, CT_STATE_KERNEL);
} else {
if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) {
/* Tracking for vtime only, no concurrent RCU EQS accounting */
raw_atomic_set(&ct->state, CONTEXT_KERNEL);
raw_atomic_set(&ct->state, CT_STATE_KERNEL);
} else {
/*
* Tracking for vtime and RCU EQS. Make sure we don't race

2
kernel/entry/common.c
View File

@ -182,7 +182,7 @@ static void syscall_exit_to_user_mode_prepare(struct pt_regs *regs)
unsigned long work = READ_ONCE(current_thread_info()->syscall_work);
unsigned long nr = syscall_get_nr(current, regs);
CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
CT_WARN_ON(ct_state() != CT_STATE_KERNEL);
if (IS_ENABLED(CONFIG_PROVE_LOCKING)) {
if (WARN(irqs_disabled(), "syscall %lu left IRQs disabled", nr))

4
kernel/sched/core.c
View File

@ -5762,7 +5762,7 @@ static inline void schedule_debug(struct task_struct *prev, bool preempt)
preempt_count_set(PREEMPT_DISABLED);
}
rcu_sleep_check();
SCHED_WARN_ON(ct_state() == CONTEXT_USER);
SCHED_WARN_ON(ct_state() == CT_STATE_USER);
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
@ -6658,7 +6658,7 @@ asmlinkage __visible void __sched schedule_user(void)
* we find a better solution.
*
* NB: There are buggy callers of this function. Ideally we
* should warn if prev_state != CONTEXT_USER, but that will trigger
* should warn if prev_state != CT_STATE_USER, but that will trigger
* too frequently to make sense yet.
*/
enum ctx_state prev_state = exception_enter();