diff options
| author | Tony Luck <tony.luck@intel.com> | 2024-06-10 03:39:24 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-10 09:50:01 +0300 |
| commit | 195fb517ee25bfefde9c74ecd86348eccbd6d2e4 (patch) | |
| tree | 2e8fb9e5232cacccb22e2afc38dd41c125002726 /include/linux/cpuhplock.h | |
| parent | 83a7eefedc9b56fe7bfeff13b6c7356688ffa670 (diff) | |
| download | linux-195fb517ee25bfefde9c74ecd86348eccbd6d2e4.tar.xz | |
cpu: Move CPU hotplug function declarations into their own header
Avoid upcoming #include hell when <linux/cachinfo.h> wants to use
lockdep_assert_cpus_held() and creates a #include loop that would
break the build for arch/riscv.
[ bp: s/cpu/CPU/g ]
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240610003927.341707-2-tony.luck@intel.com
Diffstat (limited to 'include/linux/cpuhplock.h')
| -rw-r--r-- | include/linux/cpuhplock.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/include/linux/cpuhplock.h b/include/linux/cpuhplock.h new file mode 100644 index 000000000000..386abc482264 --- /dev/null +++ b/include/linux/cpuhplock.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * include/linux/cpuhplock.h - CPU hotplug locking + * + * Locking functions for CPU hotplug. + */ +#ifndef _LINUX_CPUHPLOCK_H_ +#define _LINUX_CPUHPLOCK_H_ + +#include <linux/cleanup.h> +#include <linux/errno.h> + +struct device; + +extern int lockdep_is_cpus_held(void); + +#ifdef CONFIG_HOTPLUG_CPU +extern void cpus_write_lock(void); +extern void cpus_write_unlock(void); +extern void cpus_read_lock(void); +extern void cpus_read_unlock(void); +extern int cpus_read_trylock(void); +extern void lockdep_assert_cpus_held(void); +extern void cpu_hotplug_disable(void); +extern void cpu_hotplug_enable(void); +void clear_tasks_mm_cpumask(int cpu); +int remove_cpu(unsigned int cpu); +int cpu_device_down(struct device *dev); +extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu); + +#else /* CONFIG_HOTPLUG_CPU */ + +static inline void cpus_write_lock(void) { } +static inline void cpus_write_unlock(void) { } +static inline void cpus_read_lock(void) { } +static inline void cpus_read_unlock(void) { } +static inline int cpus_read_trylock(void) { return true; } +static inline void lockdep_assert_cpus_held(void) { } +static inline void cpu_hotplug_disable(void) { } +static inline void cpu_hotplug_enable(void) { } +static inline int remove_cpu(unsigned int cpu) { return -EPERM; } +static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } +#endif /* !CONFIG_HOTPLUG_CPU */ + +DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock()) + +#endif /* _LINUX_CPUHPLOCK_H_ */ |