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gpiolib: Avoid the hotplug performance reduction #6862

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Merged
pelwell merged 1 commit into from
May 21, 2025
Merged

gpiolib: Avoid the hotplug performance reduction #6862

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36 changes: 36 additions & 0 deletions drivers/gpio/gpiolib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,42 @@

#define dont_test_bit(b,d) (0)

#define REJECT_HOTPLUG_TAX 1

#if REJECT_HOTPLUG_TAX

#undef srcu_dereference
#define srcu_dereference(obj, srcu) obj

#undef srcu_dereference_check
#define srcu_dereference_check(obj, srcu, held) obj

#undef guard
#define guard(srcu) (void)

#undef scoped_guard
#define scoped_guard(x, y)
#undef list_for_each_entry_srcu
#define list_for_each_entry_srcu(pos, head, member, srcu) \
list_for_each_entry(pos, head, member)

#undef CLASS
#define CLASS(gcg, gd) \
struct gcg gd = gcg ## _init

static struct gpio_chip_guard gpio_chip_guard_init(struct gpio_desc *desc)
{
struct gpio_chip_guard _guard;

_guard.gdev = desc->gdev;
_guard.idx = 0;
_guard.gc = _guard.gdev->chip;

return _guard;
}

#endif

/* Device and char device-related information */
static DEFINE_IDA(gpio_ida);
static dev_t gpio_devt;
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