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x86/entry: Rename trace_hardirqs_off_prepare()

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The typical pattern for trace_hardirqs_off_prepare() is:

  ENTRY
    lockdep_hardirqs_off(); // because hardware
    ... do entry magic
    instrumentation_begin();
    trace_hardirqs_off_prepare();
    ... do actual work
    trace_hardirqs_on_prepare();
    lockdep_hardirqs_on_prepare();
    instrumentation_end();
    ... do exit magic
    lockdep_hardirqs_on();

which shows that it's named wrong, rename it to
trace_hardirqs_off_finish(), as it concludes the hardirq_off transition.

Also, given that the above is the only correct order, make the traditional
all-in-one trace_hardirqs_off() follow suit.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200529213321.415774872@infradead.org
This commit is contained in:
Peter Zijlstra 2020-05-29 23:27:40 +02:00 committed by Thomas Gleixner
parent 59bc300b71
commit bf2b300844
6 changed files with 14 additions and 14 deletions
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6
arch/x86/entry/common.c
View File

@ -65,7 +65,7 @@ static noinstr void enter_from_user_mode(void)
instrumentation_begin();
CT_WARN_ON(state != CONTEXT_USER);
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
instrumentation_end();
}
#else
@ -73,7 +73,7 @@ static __always_inline void enter_from_user_mode(void)
{
lockdep_hardirqs_off(CALLER_ADDR0);
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
instrumentation_end();
}
#endif
@ -569,7 +569,7 @@ bool noinstr idtentry_enter_cond_rcu(struct pt_regs *regs)
lockdep_hardirqs_off(CALLER_ADDR0);
rcu_irq_enter();
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
instrumentation_end();
return true;

2
arch/x86/kernel/cpu/mce/core.c
View File

@ -1922,7 +1922,7 @@ static __always_inline void exc_machine_check_kernel(struct pt_regs *regs)
* that out because it's an indirect call. Annotate it.
*/
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
machine_check_vector(regs);
if (regs->flags & X86_EFLAGS_IF)
trace_hardirqs_on_prepare();

2
arch/x86/kernel/nmi.c
View File

@ -330,7 +330,7 @@ static noinstr void default_do_nmi(struct pt_regs *regs)
__this_cpu_write(last_nmi_rip, regs->ip);
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
handled = nmi_handle(NMI_LOCAL, regs);
__this_cpu_add(nmi_stats.normal, handled);

4
arch/x86/kernel/traps.c
View File

@ -634,7 +634,7 @@ DEFINE_IDTENTRY_RAW(exc_int3)
} else {
nmi_enter();
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
if (!do_int3(regs))
die("int3", regs, 0);
if (regs->flags & X86_EFLAGS_IF)
@ -833,7 +833,7 @@ static __always_inline void exc_debug_kernel(struct pt_regs *regs,
{
nmi_enter();
instrumentation_begin();
trace_hardirqs_off_prepare();
trace_hardirqs_off_finish();
instrumentation_end();
/*

4
include/linux/irqflags.h
View File

@ -32,7 +32,7 @@
#ifdef CONFIG_TRACE_IRQFLAGS
extern void trace_hardirqs_on_prepare(void);
extern void trace_hardirqs_off_prepare(void);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
# define lockdep_hardirq_context(p) ((p)->hardirq_context)
@ -101,7 +101,7 @@ do { \
#else
# define trace_hardirqs_on_prepare() do { } while (0)
# define trace_hardirqs_off_prepare() do { } while (0)
# define trace_hardirqs_off_finish() do { } while (0)
# define trace_hardirqs_on() do { } while (0)
# define trace_hardirqs_off() do { } while (0)
# define lockdep_hardirq_context(p) 0

10
kernel/trace/trace_preemptirq.c
View File

@ -58,7 +58,7 @@ NOKPROBE_SYMBOL(trace_hardirqs_on);
* and lockdep uses a staged approach which splits the lockdep hardirq
* tracking into a RCU on and a RCU off section.
*/
void trace_hardirqs_off_prepare(void)
void trace_hardirqs_off_finish(void)
{
if (!this_cpu_read(tracing_irq_cpu)) {
this_cpu_write(tracing_irq_cpu, 1);
@ -68,19 +68,19 @@ void trace_hardirqs_off_prepare(void)
}
}
EXPORT_SYMBOL(trace_hardirqs_off_prepare);
NOKPROBE_SYMBOL(trace_hardirqs_off_prepare);
EXPORT_SYMBOL(trace_hardirqs_off_finish);
NOKPROBE_SYMBOL(trace_hardirqs_off_finish);
void trace_hardirqs_off(void)
{
lockdep_hardirqs_off(CALLER_ADDR0);
if (!this_cpu_read(tracing_irq_cpu)) {
this_cpu_write(tracing_irq_cpu, 1);
tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
if (!in_nmi())
trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
}
lockdep_hardirqs_off(CALLER_ADDR0);
}
EXPORT_SYMBOL(trace_hardirqs_off);
NOKPROBE_SYMBOL(trace_hardirqs_off);