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Diffstat (limited to 'include/linux/processor.h')
| -rw-r--r-- | include/linux/processor.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/processor.h b/include/linux/processor.h new file mode 100644 index 0000000000..94a458c3d1 --- /dev/null +++ b/include/linux/processor.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Misc low level processor primitives */ +#ifndef _LINUX_PROCESSOR_H +#define _LINUX_PROCESSOR_H + +#include <linux/barebox-wrapper.h> + +/* + * spin_until_cond can be used to wait for a condition to become true. It + * may be expected that the first iteration will true in the common case + * (no spinning), so that callers should not require a first "likely" test + * for the uncontended case before using this primitive. + * + * Usage and implementation guidelines are the same as for the spin_begin + * primitives, above. + */ +#ifndef spin_until_cond +#define spin_until_cond(cond) \ +do { \ + if (unlikely(!(cond))) { \ + do { \ + cpu_relax(); \ + } while (!(cond)); \ + } \ +} while (0) + +#endif + +#endif /* _LINUX_PROCESSOR_H */ |