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use small lock in following files:

Browse source 
arch/arm/src/am335x/am335x_can.c
    arch/arm/src/am335x/am335x_gpio.c
    arch/arm/src/am335x/am335x_i2c.c
    arch/arm/src/am335x/am335x_irq.c
    arch/arm/src/am335x/am335x_serial.c
    arch/arm64/src/imx9/imx9_gpio.c
    arch/arm64/src/imx9/imx9_lpi2c.c
    arch/arm64/src/imx9/imx9_lpspi.c
    arch/arm64/src/imx9/imx9_usbdev.c
    arch/x86_64/src/intel64/intel64_tsc_tickless.c

Signed-off-by: wangzhi16 <wangzhi16@xiaomi.com>
This commit is contained in:
wangzhi16 2025-01-07 16:58:10 +08:00 committed by Xiang Xiao
parent 58c95f5d85
commit d84ba608a1
10 changed files with 108 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
arch/arm/src/am335x/am335x_can.c
View file

@ -27,9 +27,11 @@
#include <nuttx/config.h>
#include <assert.h>
#include <sched.h>
#include <arch/board/board.h>
#include <nuttx/irq.h>
#include <nuttx/spinlock.h>
#include <nuttx/arch.h>
#include <nuttx/can/can.h>
@ -205,6 +207,8 @@ static struct can_dev_s g_can1dev =
};
#endif
static spinlock_t g_can_lock = SP_UNLOCKED;
/****************************************************************************
* Private Functions
****************************************************************************/
@ -1079,7 +1083,8 @@ struct can_dev_s *am335x_can_initialize(int port)
syslog(LOG_DEBUG, "CAN%d\n", port);
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_can_lock);
sched_lock();
#ifdef CONFIG_AM335X_CAN0
if (port == 0)
@ -1109,11 +1114,13 @@ struct can_dev_s *am335x_can_initialize(int port)
{
canerr("Unsupported port: %d\n", port);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_can_lock, flags);
sched_unlock();
return NULL;
}
leave_critical_section(flags);
spin_unlock_irqrestore(&g_can_lock, flags);
sched_unlock();
return candev;
}
@ -1124,7 +1131,8 @@ void am335x_can_uninitialize(struct can_dev_s *dev)
DEBUGASSERT(dev);
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_can_lock);
sched_lock();
#ifdef CONFIG_AM335X_CAN0
if (dev == &g_can0dev)
@ -1151,7 +1159,8 @@ void am335x_can_uninitialize(struct can_dev_s *dev)
canerr("Not a CAN device: %p\n", dev);
}
leave_critical_section(flags);
spin_unlock_irqrestore(&g_can_lock, flags);
sched_unlock();
}
#endif

15
arch/arm/src/am335x/am335x_gpio.c
View file

@ -31,6 +31,7 @@
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/spinlock.h>
#include "chip.h"
#include "arm_internal.h"
@ -219,6 +220,8 @@ static const uint8_t *g_gpio_padctl[AM335X_GPIO_NPORTS] =
g_gpio3_padctl, /* GPIO3 */
};
static spinlock_t g_gpio_lock = SP_UNLOCKED;
/****************************************************************************
* Private Functions
****************************************************************************/
@ -364,7 +367,7 @@ int am335x_gpio_config(gpio_pinset_t pinset)
/* Configure the pin as an input initially to avoid any spurious outputs */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
/* Configure based upon the pin mode */
@ -407,7 +410,7 @@ int am335x_gpio_config(gpio_pinset_t pinset)
break;
}
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
return ret;
}
@ -425,9 +428,9 @@ void am335x_gpio_write(gpio_pinset_t pinset, bool value)
int port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
int pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
am335x_gpio_setoutput(port, pin, value);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
}
/****************************************************************************
@ -445,9 +448,9 @@ bool am335x_gpio_read(gpio_pinset_t pinset)
int pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
bool value;
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
value = am335x_gpio_getinput(port, pin);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
return value;
}

25
arch/arm/src/am335x/am335x_i2c.c
View file

@ -37,6 +37,7 @@
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/spinlock.h>
#include <nuttx/clock.h>
#include <nuttx/mutex.h>
#include <nuttx/semaphore.h>
@ -185,6 +186,7 @@ struct am335x_i2c_priv_s
int refs; /* Reference count */
mutex_t lock; /* Mutual exclusion mutex */
spinlock_t spinlock; /* Spinlock */
#ifndef CONFIG_I2C_POLLED
sem_t sem_isr; /* Interrupt wait semaphore */
#endif
@ -317,6 +319,7 @@ static struct am335x_i2c_priv_s am335x_i2c0_priv =
.config = &am335x_i2c0_config,
.refs = 0,
.lock = NXMUTEX_INITIALIZER,
.spinlock = SP_UNLOCKED,
#ifndef CONFIG_I2C_POLLED
.sem_isr = SEM_INITIALIZER(0),
#endif
@ -352,6 +355,7 @@ static struct am335x_i2c_priv_s am335x_i2c1_priv =
.config = &am335x_i2c1_config,
.refs = 0,
.lock = NXMUTEX_INITIALIZER,
.spinlock = SP_UNLOCKED,
#ifndef CONFIG_I2C_POLLED
.sem_isr = SEM_INITIALIZER(0),
#endif
@ -387,6 +391,7 @@ static struct am335x_i2c_priv_s am335x_i2c2_priv =
.config = &am335x_i2c2_config,
.refs = 0,
.lock = NXMUTEX_INITIALIZER,
.spinlock = SP_UNLOCKED,
#ifndef CONFIG_I2C_POLLED
.sem_isr = SEM_INITIALIZER(0),
#endif
@ -492,7 +497,7 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
uint32_t regval;
int ret;
flags = enter_critical_section();
flags = spin_lock_irqsave(&priv->spinlock);
/* Enable Interrupts when master mode */
@ -529,6 +534,8 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
*/
priv->intstate = INTSTATE_WAITING;
spin_unlock_irqrestore(&priv->spinlock, flags);
do
{
/* Wait until either the transfer is complete or the timeout expires */
@ -551,6 +558,8 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
}
}
flags = spin_lock_irqsave(&priv->spinlock);
/* Loop until the interrupt level transfer is complete. */
while (priv->intstate != INTSTATE_DONE);
@ -563,7 +572,7 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
am335x_i2c_putreg(priv, AM335X_I2C_IRQ_EN_CLR_OFFSET, I2C_ICR_CLEARMASK);
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
return ret;
}
#else
@ -992,7 +1001,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
*/
#ifdef CONFIG_I2C_POLLED
irqstate_t flags = enter_critical_section();
irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
#endif
/* Transmit a byte */
@ -1001,7 +1010,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
priv->dcnt--;
#ifdef CONFIG_I2C_POLLED
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
#endif
if ((priv->dcnt == 0) && ((priv->flags & I2C_M_NOSTOP) == 0))
{
@ -1026,7 +1035,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
*/
#ifdef CONFIG_I2C_POLLED
irqstate_t flags = enter_critical_section();
irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
#endif
/* Receive a byte */
@ -1036,7 +1045,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
priv->dcnt--;
#ifdef CONFIG_I2C_POLLED
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
#endif
if ((priv->msgc <= 0) && (priv->dcnt == 0))
{
@ -1100,7 +1109,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
*/
#ifdef CONFIG_I2C_POLLED
irqstate_t flags = enter_critical_section();
irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
#endif
/* Transmit a byte */
@ -1109,7 +1118,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
priv->dcnt--;
#ifdef CONFIG_I2C_POLLED
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
#endif
if ((priv->dcnt == 0) && ((priv->flags & I2C_M_NOSTOP) == 0))
{

12
arch/arm/src/am335x/am335x_irq.c
View file

@ -29,6 +29,7 @@
#include <assert.h>
#include <nuttx/arch.h>
#include <nuttx/spinlock.h>
#include "arm_internal.h"
#include "sctlr.h"
@ -36,6 +37,13 @@
#include "am335x_gpio.h"
#include "am335x_irq.h"
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_ARCH_IRQPRIO
static spinlock_t g_irq_lock = SP_UNLOCKED;
#endif
/****************************************************************************
* Public Data
****************************************************************************/
@ -328,7 +336,7 @@ int up_prioritize_irq(int irq, int priority)
{
/* These operations must be atomic */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_irq_lock);
#if 0 // TODO
/* Set the new priority */
@ -340,7 +348,7 @@ int up_prioritize_irq(int irq, int priority)
putreg32(regval, regaddr);
#endif
leave_critical_section(flags);
spin_unlock_irqrestore(&g_irq_lock, flags);
return OK;
}

66
arch/arm/src/am335x/am335x_serial.c
View file

@ -39,6 +39,7 @@
#endif
#include <nuttx/irq.h>
#include <nuttx/spinlock.h>
#include <nuttx/arch.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/serial/serial.h>
@ -76,13 +77,14 @@
struct up_dev_s
{
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint32_t ier; /* Saved IER value */
uint8_t irq; /* IRQ associated with this UART */
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (7 or 8) */
bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint32_t ier; /* Saved IER value */
uint8_t irq; /* IRQ associated with this UART */
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (7 or 8) */
bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
spinlock_t spinlock; /* Spinlock */
};
/****************************************************************************
@ -169,6 +171,7 @@ static struct up_dev_s g_uart0priv =
.parity = CONFIG_UART0_PARITY,
.bits = CONFIG_UART0_BITS,
.stopbits2 = CONFIG_UART0_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart0port =
@ -200,6 +203,7 @@ static struct up_dev_s g_uart1priv =
.parity = CONFIG_UART1_PARITY,
.bits = CONFIG_UART1_BITS,
.stopbits2 = CONFIG_UART1_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart1port =
@ -230,6 +234,7 @@ static struct up_dev_s g_uart2priv =
.parity = CONFIG_UART2_PARITY,
.bits = CONFIG_UART2_BITS,
.stopbits2 = CONFIG_UART2_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart2port =
@ -260,6 +265,7 @@ static struct up_dev_s g_uart3priv =
.parity = CONFIG_UART3_PARITY,
.bits = CONFIG_UART3_BITS,
.stopbits2 = CONFIG_UART3_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart3port =
@ -290,6 +296,7 @@ static struct up_dev_s g_uart4priv =
.parity = CONFIG_UART4_PARITY,
.bits = CONFIG_UART4_BITS,
.stopbits2 = CONFIG_UART4_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart4port =
@ -320,6 +327,7 @@ static struct up_dev_s g_uart5priv =
.parity = CONFIG_UART5_PARITY,
.bits = CONFIG_UART5_BITS,
.stopbits2 = CONFIG_UART5_2STOP,
.spinlock = SP_UNLOCKED,
};
static uart_dev_t g_uart5port =
@ -484,6 +492,10 @@ static uart_dev_t g_uart5port =
# define UART5_ASSIGNED 1
#endif
/* Spinlock */
static spinlock_t g_gpio_lock = SP_UNLOCKED;
/****************************************************************************
* Inline Functions
****************************************************************************/
@ -567,7 +579,7 @@ static inline void am335x_uart0config(void)
/* Step 1: Enable power to UART0 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking to UART0 */
@ -577,7 +589,7 @@ static inline void am335x_uart0config(void)
am335x_gpio_config(GPIO_UART0_TXD);
am335x_gpio_config(GPIO_UART0_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -588,7 +600,7 @@ static inline void am335x_uart1config(void)
/* Step 1: Enable power to UART1 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking to UART1 */
@ -598,7 +610,7 @@ static inline void am335x_uart1config(void)
am335x_gpio_config(GPIO_UART1_TXD);
am335x_gpio_config(GPIO_UART1_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -609,7 +621,7 @@ static inline void am335x_uart2config(void)
/* Step 1: Enable power to UART2 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking on UART2 */
@ -619,7 +631,7 @@ static inline void am335x_uart2config(void)
am335x_gpio_config(GPIO_UART2_TXD);
am335x_gpio_config(GPIO_UART2_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -630,7 +642,7 @@ static inline void am335x_uart3config(void)
/* Step 1: Enable power to UART3 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking to UART3 */
@ -640,7 +652,7 @@ static inline void am335x_uart3config(void)
am335x_gpio_config(GPIO_UART3_TXD);
am335x_gpio_config(GPIO_UART3_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -651,7 +663,7 @@ static inline void am335x_uart4config(void)
/* Step 1: Enable power to UART4 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking to UART4 */
@ -661,7 +673,7 @@ static inline void am335x_uart4config(void)
am335x_gpio_config(GPIO_UART4_TXD);
am335x_gpio_config(GPIO_UART4_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -672,7 +684,7 @@ static inline void am335x_uart5config(void)
/* Step 1: Enable power to UART5 */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
#warning Missing logic
/* Step 2: Enable clocking to UART5 */
@ -682,7 +694,7 @@ static inline void am335x_uart5config(void)
am335x_gpio_config(GPIO_UART5_TXD);
am335x_gpio_config(GPIO_UART5_RXD);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
};
#endif
@ -1029,18 +1041,18 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */
{
irqstate_t flags = enter_critical_section();
irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
up_enablebreaks(priv, true);
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
}
break;
case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */
{
irqstate_t flags;
flags = enter_critical_section();
flags = spin_lock_irqsave(&priv->spinlock);
up_enablebreaks(priv, false);
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
}
break;
@ -1204,13 +1216,15 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
irqstate_t flags;
flags = enter_critical_section();
flags = spin_lock_irqsave(&priv->spinlock);
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= UART_IER_THR;
up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier);
spin_unlock_irqrestore(&priv->spinlock, flags);
/* Fake a TX interrupt here by just calling uart_xmitchars() with
* interrupts disabled (note this may recurse).
*/
@ -1222,9 +1236,9 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
{
priv->ier &= ~UART_IER_THR;
up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier);
}
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
}
}
/****************************************************************************

17
arch/arm64/src/imx9/imx9_gpio.c
View file

@ -33,6 +33,7 @@
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/spinlock.h>
#include <imx9_gpiobase.c>
@ -45,6 +46,10 @@
* Private Functions
****************************************************************************/
/* Spinlock */
static spinlock_t g_gpio_lock = SP_UNLOCKED;
/****************************************************************************
* Name: imx9_gpio_dirout
****************************************************************************/
@ -174,7 +179,7 @@ int imx9_config_gpio(gpio_pinset_t pinset)
/* Configure the pin as an input initially to avoid any spurious outputs */
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
/* Configure based upon the pin mode */
@ -223,7 +228,7 @@ int imx9_config_gpio(gpio_pinset_t pinset)
break;
}
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
return ret;
}
@ -243,9 +248,9 @@ void imx9_gpio_write(gpio_pinset_t pinset, bool value)
DEBUGASSERT((unsigned int)port < IMX9_GPIO_NPORTS);
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
imx9_gpio_setoutput(port, pin, value);
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
}
/****************************************************************************
@ -265,7 +270,7 @@ bool imx9_gpio_read(gpio_pinset_t pinset)
DEBUGASSERT((unsigned int)port < IMX9_GPIO_NPORTS);
flags = enter_critical_section();
flags = spin_lock_irqsave(&g_gpio_lock);
if ((pinset & (GPIO_OUTPUT)) == (GPIO_OUTPUT))
{
value = imx9_gpio_get_pinstatus(port, pin);
@ -275,6 +280,6 @@ bool imx9_gpio_read(gpio_pinset_t pinset)
value = imx9_gpio_getinput(port, pin);
}
leave_critical_section(flags);
spin_unlock_irqrestore(&g_gpio_lock, flags);
return value;
}

2
arch/arm64/src/imx9/imx9_lpi2c.c
View file

@ -2438,7 +2438,7 @@ int imx9_i2cbus_uninitialize(struct i2c_master_s *dev)
if (--priv->refs > 0)
{
leave_critical_section(flags);
spin_unlock_irqrestore(&priv->spinlock, flags);
return OK;
}

4
arch/arm64/src/imx9/imx9_lpspi.c
View file

@ -1798,8 +1798,6 @@ struct spi_dev_s *imx9_lpspibus_initialize(int bus)
{
struct imx9_lpspidev_s *priv = NULL;
irqstate_t flags = enter_critical_section();
#ifdef CONFIG_IMX9_LPSPI1
if (bus == 1)
{
@ -2017,7 +2015,6 @@ struct spi_dev_s *imx9_lpspibus_initialize(int bus)
else
#endif
{
leave_critical_section(flags);
spierr("ERROR: Unsupported SPI bus: %d\n", bus);
return NULL;
}
@ -2061,7 +2058,6 @@ struct spi_dev_s *imx9_lpspibus_initialize(int bus)
}
#endif
leave_critical_section(flags);
return (struct spi_dev_s *)priv;
}

4
arch/arm64/src/imx9/imx9_usbdev.c
View file

@ -2319,9 +2319,9 @@ static int imx9_epdisable(struct usbdev_ep_s *ep)
/* Cancel any ongoing activity */
spin_unlock_irqrestore(&privep->spinlock, flags);
imx9_cancelrequests(privep, -ESHUTDOWN);
leave_critical_section(flags);
spin_unlock_irqrestore(&privep->spinlock, flags);
return OK;
}

6
arch/x86_64/src/intel64/intel64_tsc_tickless.c
View file

@ -57,6 +57,7 @@
#include <nuttx/arch.h>
#include <nuttx/clock.h>
#include <nuttx/spinlock.h>
#ifdef CONFIG_SCHED_TICKLESS
@ -90,6 +91,7 @@ static uint32_t g_timer_active;
static irqstate_t g_tmr_sync_count;
static irqstate_t g_tmr_flags;
static spinlock_t g_tmr_lock = SP_UNLOCKED;
/****************************************************************************
* Private Functions
@ -161,7 +163,7 @@ static inline void up_tmr_sync_up(void)
{
if (!g_tmr_sync_count)
{
g_tmr_flags = enter_critical_section();
g_tmr_flags = spin_lock_irqsave(&g_tmr_lock);
}
g_tmr_sync_count++;
@ -171,7 +173,7 @@ static inline void up_tmr_sync_down(void)
{
if (g_tmr_sync_count == 1)
{
leave_critical_section(g_tmr_flags);
spin_unlock_irqrestore(&g_tmr_lock, g_tmr_flags);
}
if (g_tmr_sync_count > 0)