Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
28 lines
462 B
C
28 lines
462 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* ARM64 Spinlock support
|
|
*/
|
|
#include <stdint.h>
|
|
|
|
#include "spinlock.h"
|
|
|
|
void spin_lock(struct spinlock *lock)
|
|
{
|
|
int val, res;
|
|
|
|
asm volatile(
|
|
"1: ldaxr %w0, [%2]\n"
|
|
" cbnz %w0, 1b\n"
|
|
" mov %w0, #1\n"
|
|
" stxr %w1, %w0, [%2]\n"
|
|
" cbnz %w1, 1b\n"
|
|
: "=&r" (val), "=&r" (res)
|
|
: "r" (&lock->v)
|
|
: "memory");
|
|
}
|
|
|
|
void spin_unlock(struct spinlock *lock)
|
|
{
|
|
asm volatile("stlr wzr, [%0]\n" : : "r" (&lock->v) : "memory");
|
|
}
|