diff options
author | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-11 10:41:07 +0300 |
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committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-13 08:17:18 +0300 |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/include/asm-generic/qspinlock_types.h | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/include/asm-generic/qspinlock_types.h')
-rw-r--r-- | kernel/include/asm-generic/qspinlock_types.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/qspinlock_types.h b/kernel/include/asm-generic/qspinlock_types.h new file mode 100644 index 000000000..85f888e86 --- /dev/null +++ b/kernel/include/asm-generic/qspinlock_types.h @@ -0,0 +1,79 @@ +/* + * Queued spinlock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P. + * + * Authors: Waiman Long <waiman.long@hp.com> + */ +#ifndef __ASM_GENERIC_QSPINLOCK_TYPES_H +#define __ASM_GENERIC_QSPINLOCK_TYPES_H + +/* + * Including atomic.h with PARAVIRT on will cause compilation errors because + * of recursive header file incluson via paravirt_types.h. So don't include + * it if PARAVIRT is on. + */ +#ifndef CONFIG_PARAVIRT +#include <linux/types.h> +#include <linux/atomic.h> +#endif + +typedef struct qspinlock { + atomic_t val; +} arch_spinlock_t; + +/* + * Bitfields in the atomic value: + * + * When NR_CPUS < 16K + * 0- 7: locked byte + * 8: pending + * 9-15: not used + * 16-17: tail index + * 18-31: tail cpu (+1) + * + * When NR_CPUS >= 16K + * 0- 7: locked byte + * 8: pending + * 9-10: tail index + * 11-31: tail cpu (+1) + */ +#define _Q_SET_MASK(type) (((1U << _Q_ ## type ## _BITS) - 1)\ + << _Q_ ## type ## _OFFSET) +#define _Q_LOCKED_OFFSET 0 +#define _Q_LOCKED_BITS 8 +#define _Q_LOCKED_MASK _Q_SET_MASK(LOCKED) + +#define _Q_PENDING_OFFSET (_Q_LOCKED_OFFSET + _Q_LOCKED_BITS) +#if CONFIG_NR_CPUS < (1U << 14) +#define _Q_PENDING_BITS 8 +#else +#define _Q_PENDING_BITS 1 +#endif +#define _Q_PENDING_MASK _Q_SET_MASK(PENDING) + +#define _Q_TAIL_IDX_OFFSET (_Q_PENDING_OFFSET + _Q_PENDING_BITS) +#define _Q_TAIL_IDX_BITS 2 +#define _Q_TAIL_IDX_MASK _Q_SET_MASK(TAIL_IDX) + +#define _Q_TAIL_CPU_OFFSET (_Q_TAIL_IDX_OFFSET + _Q_TAIL_IDX_BITS) +#define _Q_TAIL_CPU_BITS (32 - _Q_TAIL_CPU_OFFSET) +#define _Q_TAIL_CPU_MASK _Q_SET_MASK(TAIL_CPU) + +#define _Q_TAIL_OFFSET _Q_TAIL_IDX_OFFSET +#define _Q_TAIL_MASK (_Q_TAIL_IDX_MASK | _Q_TAIL_CPU_MASK) + +#define _Q_LOCKED_VAL (1U << _Q_LOCKED_OFFSET) +#define _Q_PENDING_VAL (1U << _Q_PENDING_OFFSET) + +#endif /* __ASM_GENERIC_QSPINLOCK_TYPES_H */ |