Date: Mon, 5 Jul 2021 00:23:42 GMT From: Vladimir Kondratyev <wulf@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c77ec79b57aa - main - LinuxKPI: Change flags parameter type of atomic_dec_and_lock_irqsave Message-ID: <202107050023.1650NgF4022534@gitrepo.freebsd.org>
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The branch main has been updated by wulf: URL: https://cgit.FreeBSD.org/src/commit/?id=c77ec79b57aa92b428b940ed550a4a14ed44da48 commit c77ec79b57aa92b428b940ed550a4a14ed44da48 Author: Vladimir Kondratyev <wulf@FreeBSD.org> AuthorDate: 2021-07-05 00:19:01 +0000 Commit: Vladimir Kondratyev <wulf@FreeBSD.org> CommitDate: 2021-07-05 00:19:01 +0000 LinuxKPI: Change flags parameter type of atomic_dec_and_lock_irqsave On Linux atomic_dec_and_lock_irqsave is a wrapper macro which provides a reference to third parameter rather than parameter value itself to implementation routine called _atomic_dec_and_lock_irqsave [1]. While here, implement a fast path. [1] https://github.com/torvalds/linux/blob/master/include/linux/spinlock.h#L476 Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D30781 --- sys/compat/linuxkpi/common/include/linux/spinlock.h | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/sys/compat/linuxkpi/common/include/linux/spinlock.h b/sys/compat/linuxkpi/common/include/linux/spinlock.h index ca51fd23434c..46b1f8b9a180 100644 --- a/sys/compat/linuxkpi/common/include/linux/spinlock.h +++ b/sys/compat/linuxkpi/common/include/linux/spinlock.h @@ -163,15 +163,20 @@ spin_lock_destroy(spinlock_t *lock) mtx_assert(&(_l)->m, MA_OWNED); \ } while (0) +#define atomic_dec_and_lock_irqsave(cnt, lock, flags) \ + _atomic_dec_and_lock_irqsave(cnt, lock, &(flags)) static inline int -atomic_dec_and_lock_irqsave(atomic_t *cnt, spinlock_t *lock, - unsigned long flags) +_atomic_dec_and_lock_irqsave(atomic_t *cnt, spinlock_t *lock, + unsigned long *flags) { - spin_lock_irqsave(lock, flags); + if (atomic_add_unless(cnt, -1, 1)) + return (0); + + spin_lock_irqsave(lock, *flags); if (atomic_dec_and_test(cnt)) - return 1; - spin_unlock_irqrestore(lock, flags); - return 0; + return (1); + spin_unlock_irqrestore(lock, *flags); + return (0); } #endif /* _LINUX_SPINLOCK_H_ */
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