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locking/local_lock: Support Clang's context analysis

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Add support for Clang's context analysis for local_lock_t and
local_trylock_t.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-20-elver@google.com
This commit is contained in:
Marco Elver
2025-12-19 16:40:08 +01:00
committed by Peter Zijlstra
parent 8c9c8566e1
commit d3febf16de
4 changed files with 159 additions and 34 deletions
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73
lib/test_context-analysis.c
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@@ -6,7 +6,9 @@
#include <linux/bit_spinlock.h>
#include <linux/build_bug.h>
#include <linux/local_lock.h>
#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/rwsem.h>
#include <linux/seqlock.h>
@@ -458,3 +460,74 @@ static void __used test_srcu_guard(struct test_srcu_data *d)
{ guard(srcu_fast)(&d->srcu); (void)srcu_dereference(d->data, &d->srcu); }
{ guard(srcu_fast_notrace)(&d->srcu); (void)srcu_dereference(d->data, &d->srcu); }
}
struct test_local_lock_data {
local_lock_t lock;
int counter __guarded_by(&lock);
};
static DEFINE_PER_CPU(struct test_local_lock_data, test_local_lock_data) = {
.lock = INIT_LOCAL_LOCK(lock),
};
static void __used test_local_lock_init(struct test_local_lock_data *d)
{
local_lock_init(&d->lock);
d->counter = 0;
}
static void __used test_local_lock(void)
{
unsigned long flags;
local_lock(&test_local_lock_data.lock);
this_cpu_add(test_local_lock_data.counter, 1);
local_unlock(&test_local_lock_data.lock);
local_lock_irq(&test_local_lock_data.lock);
this_cpu_add(test_local_lock_data.counter, 1);
local_unlock_irq(&test_local_lock_data.lock);
local_lock_irqsave(&test_local_lock_data.lock, flags);
this_cpu_add(test_local_lock_data.counter, 1);
local_unlock_irqrestore(&test_local_lock_data.lock, flags);
local_lock_nested_bh(&test_local_lock_data.lock);
this_cpu_add(test_local_lock_data.counter, 1);
local_unlock_nested_bh(&test_local_lock_data.lock);
}
static void __used test_local_lock_guard(void)
{
{ guard(local_lock)(&test_local_lock_data.lock); this_cpu_add(test_local_lock_data.counter, 1); }
{ guard(local_lock_irq)(&test_local_lock_data.lock); this_cpu_add(test_local_lock_data.counter, 1); }
{ guard(local_lock_irqsave)(&test_local_lock_data.lock); this_cpu_add(test_local_lock_data.counter, 1); }
{ guard(local_lock_nested_bh)(&test_local_lock_data.lock); this_cpu_add(test_local_lock_data.counter, 1); }
}
struct test_local_trylock_data {
local_trylock_t lock;
int counter __guarded_by(&lock);
};
static DEFINE_PER_CPU(struct test_local_trylock_data, test_local_trylock_data) = {
.lock = INIT_LOCAL_TRYLOCK(lock),
};
static void __used test_local_trylock_init(struct test_local_trylock_data *d)
{
local_trylock_init(&d->lock);
d->counter = 0;
}
static void __used test_local_trylock(void)
{
local_lock(&test_local_trylock_data.lock);
this_cpu_add(test_local_trylock_data.counter, 1);
local_unlock(&test_local_trylock_data.lock);
if (local_trylock(&test_local_trylock_data.lock)) {
this_cpu_add(test_local_trylock_data.counter, 1);
local_unlock(&test_local_trylock_data.lock);
}
}