https://github.com/torvalds/linux
Revision b69bea8a657b681442765b06be92a2607b1bd875 authored by Linus Torvalds on 30 August 2020, 18:43:50 UTC, committed by Linus Torvalds on 30 August 2020, 18:43:50 UTC
Pull locking fixes from Thomas Gleixner:
"A set of fixes for lockdep, tracing and RCU:
- Prevent recursion by using raw_cpu_* operations
- Fixup the interrupt state in the cpu idle code to be consistent
- Push rcu_idle_enter/exit() invocations deeper into the idle path so
that the lock operations are inside the RCU watching sections
- Move trace_cpu_idle() into generic code so it's called before RCU
goes idle.
- Handle raw_local_irq* vs. local_irq* operations correctly
- Move the tracepoints out from under the lockdep recursion handling
which turned out to be fragile and inconsistent"
* tag 'locking-urgent-2020-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
lockdep,trace: Expose tracepoints
lockdep: Only trace IRQ edges
mips: Implement arch_irqs_disabled()
arm64: Implement arch_irqs_disabled()
nds32: Implement arch_irqs_disabled()
locking/lockdep: Cleanup
x86/entry: Remove unused THUNKs
cpuidle: Move trace_cpu_idle() into generic code
cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic
sched,idle,rcu: Push rcu_idle deeper into the idle path
cpuidle: Fixup IRQ state
lockdep: Use raw_cpu_*() for per-cpu variables
Tip revision: b69bea8a657b681442765b06be92a2607b1bd875 authored by Linus Torvalds on 30 August 2020, 18:43:50 UTC
Merge tag 'locking-urgent-2020-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Merge tag 'locking-urgent-2020-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Tip revision: b69bea8
memregion.c
// SPDX-License-Identifier: GPL-2.0-only
/* identifiers for device / performance-differentiated memory regions */
#include <linux/idr.h>
#include <linux/types.h>
static DEFINE_IDA(memregion_ids);
int memregion_alloc(gfp_t gfp)
{
return ida_alloc(&memregion_ids, gfp);
}
EXPORT_SYMBOL(memregion_alloc);
void memregion_free(int id)
{
ida_free(&memregion_ids, id);
}
EXPORT_SYMBOL(memregion_free);
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