From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- arch/s390/lib/delay.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 arch/s390/lib/delay.c (limited to 'arch/s390/lib/delay.c') diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c new file mode 100644 index 000000000..c1ea14e3c --- /dev/null +++ b/arch/s390/lib/delay.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Precise Delay Loops for S390 + * + * Copyright IBM Corp. 1999, 2008 + * Author(s): Martin Schwidefsky , + */ + +#include +#include +#include +#include +#include + +void __delay(unsigned long loops) +{ + /* + * Loop 'loops' times. Callers must not assume a specific + * amount of time passes before this function returns. + */ + asm volatile("0: brct %0,0b" : : "d" ((loops/2) + 1)); +} +EXPORT_SYMBOL(__delay); + +static void delay_loop(unsigned long delta) +{ + unsigned long end; + + end = get_tod_clock_monotonic() + delta; + while (!tod_after(get_tod_clock_monotonic(), end)) + cpu_relax(); +} + +void __udelay(unsigned long usecs) +{ + delay_loop(usecs << 12); +} +EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long nsecs) +{ + nsecs <<= 9; + do_div(nsecs, 125); + delay_loop(nsecs); +} +EXPORT_SYMBOL(__ndelay); -- cgit v1.3.1