Merge tag 'iopoll-busy-loop-timeout-tag' into renesas-clk-for-v6.5 (f267be79) · Commits · EulixOS / Software / Kernel

include/linux/iopoll.h

+19 −5

Original line number	Diff line number	Diff line
		@@ -53,6 +53,7 @@
		} \
		if (__sleep_us) \
		usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
		cpu_relax(); \
		} \
		(cond) ? 0 : -ETIMEDOUT; \
		})
		@@ -73,6 +74,10 @@
		* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
		* case, the last read value at @args is stored in @val.
		*
		* This macro does not rely on timekeeping. Hence it is safe to call even when
		* timekeeping is suspended, at the expense of an underestimation of wall clock
		* time, which is rather minimal with a non-zero delay_us.
		*
		* When available, you'll probably want to use one of the specialized
		* macros defined below rather than this macro directly.
		*/
		@@ -80,21 +85,30 @@
		delay_before_read, args...) \
		({ \
		u64 __timeout_us = (timeout_us); \
		s64 __left_ns = __timeout_us * NSEC_PER_USEC; \
		unsigned long __delay_us = (delay_us); \
		ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
		if (delay_before_read && __delay_us) \
		u64 __delay_ns = __delay_us * NSEC_PER_USEC; \
		if (delay_before_read && __delay_us) { \
		udelay(__delay_us); \
		if (__timeout_us) \
		__left_ns -= __delay_ns; \
		} \
		for (;;) { \
		(val) = op(args); \
		if (cond) \
		break; \
		if (__timeout_us && \
		ktime_compare(ktime_get(), __timeout) > 0) { \
		if (__timeout_us && __left_ns < 0) { \
		(val) = op(args); \
		break; \
		} \
		if (__delay_us) \
		if (__delay_us) { \
		udelay(__delay_us); \
		if (__timeout_us) \
		__left_ns -= __delay_ns; \
		} \
		cpu_relax(); \
		if (__timeout_us) \
		__left_ns--; \
		} \
		(cond) ? 0 : -ETIMEDOUT; \
		})