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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/kernel.h>#include <linux/atomic.h>#include <linux/sched.h>#include <linux/mm_types.h>#include <linux/gfp.h>#include <linux/sync_core.h>#include <linux/sched/coredump.h>
/* * Routines for handling mm_structs */extern struct mm_struct *mm_alloc(void);
/** * mmgrab() - Pin a &struct mm_struct. * @mm: The &struct mm_struct to pin. * * Make sure that @mm will not get freed even after the owning task * exits. This doesn't guarantee that the associated address space * will still exist later on and mmget_not_zero() has to be used before * accessing it. * * This is a preferred way to pin @mm for a longer/unbounded amount * of time. * * Use mmdrop() to release the reference acquired by mmgrab(). * * See also <Documentation/mm/active_mm.rst> for an in-depth explanation * of &mm_struct.mm_count vs &mm_struct.mm_users. */static inline void mmgrab(struct mm_struct *mm){ atomic_inc(&mm->mm_count);}
static inline void smp_mb__after_mmgrab(void){ smp_mb__after_atomic();}
extern void __mmdrop(struct mm_struct *mm);
static inline void mmdrop(struct mm_struct *mm){ /* * The implicit full barrier implied by atomic_dec_and_test() is * required by the membarrier system call before returning to * user-space, after storing to rq->curr. */ if (unlikely(atomic_dec_and_test(&mm->mm_count))) __mmdrop(mm);}
#ifdef CONFIG_PREEMPT_RT/* * RCU callback for delayed mm drop. Not strictly RCU, but call_rcu() is * by far the least expensive way to do that. */static inline void __mmdrop_delayed(struct rcu_head *rhp){ struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
__mmdrop(mm);}
/* * Invoked from finish_task_switch(). Delegates the heavy lifting on RT * kernels via RCU. */static inline void mmdrop_sched(struct mm_struct *mm){ /* Provides a full memory barrier. See mmdrop() */ if (atomic_dec_and_test(&mm->mm_count)) call_rcu(&mm->delayed_drop, __mmdrop_delayed);}#elsestatic inline void mmdrop_sched(struct mm_struct *mm){ mmdrop(mm);}#endif
/* Helpers for lazy TLB mm refcounting */static inline void mmgrab_lazy_tlb(struct mm_struct *mm){ if (IS_ENABLED(CONFIG_MMU_LAZY_TLB_REFCOUNT)) mmgrab(mm);}
static inline void mmdrop_lazy_tlb(struct mm_struct *mm){ if (IS_ENABLED(CONFIG_MMU_LAZY_TLB_REFCOUNT)) { mmdrop(mm); } else { /* * mmdrop_lazy_tlb must provide a full memory barrier, see the * membarrier comment finish_task_switch which relies on this. */ smp_mb(); }}
static inline void mmdrop_lazy_tlb_sched(struct mm_struct *mm){ if (IS_ENABLED(CONFIG_MMU_LAZY_TLB_REFCOUNT)) mmdrop_sched(mm); else smp_mb(); /* see mmdrop_lazy_tlb() above */}
/** * mmget() - Pin the address space associated with a &struct mm_struct. * @mm: The address space to pin. * * Make sure that the address space of the given &struct mm_struct doesn't * go away. This does not protect against parts of the address space being * modified or freed, however. * * Never use this function to pin this address space for an * unbounded/indefinite amount of time. * * Use mmput() to release the reference acquired by mmget(). * * See also <Documentation/mm/active_mm.rst> for an in-depth explanation * of &mm_struct.mm_count vs &mm_struct.mm_users. */static inline void mmget(struct mm_struct *mm){ atomic_inc(&mm->mm_users);}
static inline bool mmget_not_zero(struct mm_struct *mm){ return atomic_inc_not_zero(&mm->mm_users);}
/* mmput gets rid of the mappings and all user-space */extern void mmput(struct mm_struct *);#if defined(CONFIG_MMU) || defined(CONFIG_FUTEX_PRIVATE_HASH)/* same as above but performs the slow path from the async context. Can * be called from the atomic context as well */void mmput_async(struct mm_struct *);#endif
/* Grab a reference to a task's mm, if it is not already going away */extern struct mm_struct *get_task_mm(struct task_struct *task);/* * Grab a reference to a task's mm, if it is not already going away * and ptrace_may_access with the mode parameter passed to it * succeeds. */extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
/* * Remove the current tasks stale references to the old mm_struct on exit() and * exec(). Cleans up futexes as well. */extern void mm_exit_exec_release(struct task_struct *, struct mm_struct *);
#ifdef CONFIG_MEMCGextern void mm_update_next_owner(struct mm_struct *mm);#elsestatic inline void mm_update_next_owner(struct mm_struct *mm){}#endif /* CONFIG_MEMCG */
#ifdef CONFIG_MMU#ifndef arch_get_mmap_end#define arch_get_mmap_end(addr, len, flags) (TASK_SIZE)#endif
#ifndef arch_get_mmap_base#define arch_get_mmap_base(addr, base) (base)#endif
extern void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack);
unsigned longarch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags);unsigned longarch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t);
unsigned long mm_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags);
unsigned long mm_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vma_flags_t vma_flags);
unsigned longgeneric_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vma_flags_t vma_flags);unsigned longgeneric_get_unmapped_area_topdown(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vma_flags_t vma_flags);#elsestatic inline void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack) {}#endif
static inline bool in_vfork(struct task_struct *tsk){ bool ret;
/* * need RCU to access ->real_parent if CLONE_VM was used along with * CLONE_PARENT. * * We check real_parent->mm == tsk->mm because CLONE_VFORK does not * imply CLONE_VM * * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus * ->real_parent is not necessarily the task doing vfork(), so in * theory we can't rely on task_lock() if we want to dereference it. * * And in this case we can't trust the real_parent->mm == tsk->mm * check, it can be false negative. But we do not care, if init or * another oom-unkillable task does this it should blame itself. */ rcu_read_lock(); ret = tsk->vfork_done && rcu_dereference(tsk->real_parent)->mm == tsk->mm; rcu_read_unlock();
return ret;}
/* * Applies per-task gfp context to the given allocation flags. * PF_MEMALLOC_NOIO implies GFP_NOIO * PF_MEMALLOC_NOFS implies GFP_NOFS * PF_MEMALLOC_PIN implies !GFP_MOVABLE */static inline gfp_t current_gfp_context(gfp_t flags){ unsigned int pflags = READ_ONCE(current->flags);
if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) { /* * NOIO implies both NOIO and NOFS and it is a weaker context * so always make sure it makes precedence */ if (pflags & PF_MEMALLOC_NOIO) flags &= ~(__GFP_IO | __GFP_FS); else if (pflags & PF_MEMALLOC_NOFS) flags &= ~__GFP_FS;
if (pflags & PF_MEMALLOC_PIN) flags &= ~__GFP_MOVABLE; } return flags;}
#ifdef CONFIG_LOCKDEPextern void __fs_reclaim_acquire(unsigned long ip);extern void __fs_reclaim_release(unsigned long ip);extern void fs_reclaim_acquire(gfp_t gfp_mask);extern void fs_reclaim_release(gfp_t gfp_mask);#elsestatic inline void __fs_reclaim_acquire(unsigned long ip) { }static inline void __fs_reclaim_release(unsigned long ip) { }static inline void fs_reclaim_acquire(gfp_t gfp_mask) { }static inline void fs_reclaim_release(gfp_t gfp_mask) { }#endif
/* Any memory-allocation retry loop should use * memalloc_retry_wait(), and pass the flags for the most * constrained allocation attempt that might have failed. * This provides useful documentation of where loops are, * and a central place to fine tune the waiting as the MM * implementation changes. */static inline void memalloc_retry_wait(gfp_t gfp_flags){ /* We use io_schedule_timeout because waiting for memory * typically included waiting for dirty pages to be * written out, which requires IO. */ __set_current_state(TASK_UNINTERRUPTIBLE); gfp_flags = current_gfp_context(gfp_flags); if (gfpflags_allow_blocking(gfp_flags) && !(gfp_flags & __GFP_NORETRY)) /* Probably waited already, no need for much more */ io_schedule_timeout(1); else /* Probably didn't wait, and has now released a lock, * so now is a good time to wait */ io_schedule_timeout(HZ/50);}
/** * might_alloc - Mark possible allocation sites * @gfp_mask: gfp_t flags that would be used to allocate * * Similar to might_sleep() and other annotations, this can be used in functions * that might allocate, but often don't. Compiles to nothing without * CONFIG_LOCKDEP. Includes a conditional might_sleep() if @gfp allows blocking. */static inline void might_alloc(gfp_t gfp_mask){ fs_reclaim_acquire(gfp_mask); fs_reclaim_release(gfp_mask);
if (current->flags & PF_MEMALLOC) return;
might_sleep_if(gfpflags_allow_blocking(gfp_mask));}
/** * memalloc_flags_save - Add a PF_* flag to current->flags, save old value * @flags: Flags to add. * * This allows PF_* flags to be conveniently added, irrespective of current * value, and then the old version restored with memalloc_flags_restore(). */static inline unsigned memalloc_flags_save(unsigned flags){ unsigned oldflags = ~current->flags & flags; current->flags |= flags; return oldflags;}
static inline void memalloc_flags_restore(unsigned flags){ current->flags &= ~flags;}
/** * memalloc_noio_save - Marks implicit GFP_NOIO allocation scope. * * This functions marks the beginning of the GFP_NOIO allocation scope. * All further allocations will implicitly drop __GFP_IO flag and so * they are safe for the IO critical section from the allocation recursion * point of view. Use memalloc_noio_restore to end the scope with flags * returned by this function. * * Context: This function is safe to be used from any context. * Return: The saved flags to be passed to memalloc_noio_restore. */static inline unsigned int memalloc_noio_save(void){ return memalloc_flags_save(PF_MEMALLOC_NOIO);}
/** * memalloc_noio_restore - Ends the implicit GFP_NOIO scope. * @flags: Flags to restore. * * Ends the implicit GFP_NOIO scope started by memalloc_noio_save function. * Always make sure that the given flags is the return value from the * pairing memalloc_noio_save call. */static inline void memalloc_noio_restore(unsigned int flags){ memalloc_flags_restore(flags);}
/** * memalloc_nofs_save - Marks implicit GFP_NOFS allocation scope. * * This functions marks the beginning of the GFP_NOFS allocation scope. * All further allocations will implicitly drop __GFP_FS flag and so * they are safe for the FS critical section from the allocation recursion * point of view. Use memalloc_nofs_restore to end the scope with flags * returned by this function. * * Context: This function is safe to be used from any context. * Return: The saved flags to be passed to memalloc_nofs_restore. */static inline unsigned int memalloc_nofs_save(void){ return memalloc_flags_save(PF_MEMALLOC_NOFS);}
/** * memalloc_nofs_restore - Ends the implicit GFP_NOFS scope. * @flags: Flags to restore. * * Ends the implicit GFP_NOFS scope started by memalloc_nofs_save function. * Always make sure that the given flags is the return value from the * pairing memalloc_nofs_save call. */static inline void memalloc_nofs_restore(unsigned int flags){ memalloc_flags_restore(flags);}
/** * memalloc_noreclaim_save - Marks implicit __GFP_MEMALLOC scope. * * This function marks the beginning of the __GFP_MEMALLOC allocation scope. * All further allocations will implicitly add the __GFP_MEMALLOC flag, which * prevents entering reclaim and allows access to all memory reserves. This * should only be used when the caller guarantees the allocation will allow more * memory to be freed very shortly, i.e. it needs to allocate some memory in * the process of freeing memory, and cannot reclaim due to potential recursion. * * Users of this scope have to be extremely careful to not deplete the reserves * completely and implement a throttling mechanism which controls the * consumption of the reserve based on the amount of freed memory. Usage of a * pre-allocated pool (e.g. mempool) should be always considered before using * this scope. * * Individual allocations under the scope can opt out using __GFP_NOMEMALLOC * * Context: This function should not be used in an interrupt context as that one * does not give PF_MEMALLOC access to reserves. * See __gfp_pfmemalloc_flags(). * Return: The saved flags to be passed to memalloc_noreclaim_restore. */static inline unsigned int memalloc_noreclaim_save(void){ return memalloc_flags_save(PF_MEMALLOC);}
/** * memalloc_noreclaim_restore - Ends the implicit __GFP_MEMALLOC scope. * @flags: Flags to restore. * * Ends the implicit __GFP_MEMALLOC scope started by memalloc_noreclaim_save * function. Always make sure that the given flags is the return value from the * pairing memalloc_noreclaim_save call. */static inline void memalloc_noreclaim_restore(unsigned int flags){ memalloc_flags_restore(flags);}
/** * memalloc_pin_save - Marks implicit ~__GFP_MOVABLE scope. * * This function marks the beginning of the ~__GFP_MOVABLE allocation scope. * All further allocations will implicitly remove the __GFP_MOVABLE flag, which * will constraint the allocations to zones that allow long term pinning, i.e. * not ZONE_MOVABLE zones. * * Return: The saved flags to be passed to memalloc_pin_restore. */static inline unsigned int memalloc_pin_save(void){ return memalloc_flags_save(PF_MEMALLOC_PIN);}
/** * memalloc_pin_restore - Ends the implicit ~__GFP_MOVABLE scope. * @flags: Flags to restore. * * Ends the implicit ~__GFP_MOVABLE scope started by memalloc_pin_save function. * Always make sure that the given flags is the return value from the pairing * memalloc_pin_save call. */static inline void memalloc_pin_restore(unsigned int flags){ memalloc_flags_restore(flags);}
#ifdef CONFIG_MEMCGDECLARE_PER_CPU(struct mem_cgroup *, int_active_memcg);/** * set_active_memcg - Starts the remote memcg charging scope. * @memcg: memcg to charge. * * This function marks the beginning of the remote memcg charging scope. All the * __GFP_ACCOUNT allocations till the end of the scope will be charged to the * given memcg. * * Please, make sure that caller has a reference to the passed memcg structure, * so its lifetime is guaranteed to exceed the scope between two * set_active_memcg() calls. * * NOTE: This function can nest. Users must save the return value and * reset the previous value after their own charging scope is over. */static inline struct mem_cgroup *set_active_memcg(struct mem_cgroup *memcg){ struct mem_cgroup *old;
if (!in_task()) { old = this_cpu_read(int_active_memcg); this_cpu_write(int_active_memcg, memcg); } else { old = current->active_memcg; current->active_memcg = memcg; }
return old;}#elsestatic inline struct mem_cgroup *set_active_memcg(struct mem_cgroup *memcg){ return NULL;}#endif
#ifdef CONFIG_MEMBARRIERenum { MEMBARRIER_STATE_PRIVATE_EXPEDITED_READY = (1U << 0), MEMBARRIER_STATE_PRIVATE_EXPEDITED = (1U << 1), MEMBARRIER_STATE_GLOBAL_EXPEDITED_READY = (1U << 2), MEMBARRIER_STATE_GLOBAL_EXPEDITED = (1U << 3), MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE_READY = (1U << 4), MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE = (1U << 5), MEMBARRIER_STATE_PRIVATE_EXPEDITED_RSEQ_READY = (1U << 6), MEMBARRIER_STATE_PRIVATE_EXPEDITED_RSEQ = (1U << 7),};
enum { MEMBARRIER_FLAG_SYNC_CORE = (1U << 0), MEMBARRIER_FLAG_RSEQ = (1U << 1),};
#ifdef CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKS#include <asm/membarrier.h>#endif
static inline void membarrier_mm_sync_core_before_usermode(struct mm_struct *mm){ /* * The atomic_read() below prevents CSE. The following should * help the compiler generate more efficient code on architectures * where sync_core_before_usermode() is a no-op. */ if (!IS_ENABLED(CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE)) return; if (current->mm != mm) return; if (likely(!(atomic_read(&mm->membarrier_state) & MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE))) return; sync_core_before_usermode();}
extern void membarrier_exec_mmap(struct mm_struct *mm);
extern void membarrier_update_current_mm(struct mm_struct *next_mm);
#else#ifdef CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKSstatic inline void membarrier_arch_switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk){}#endifstatic inline void membarrier_exec_mmap(struct mm_struct *mm){}static inline void membarrier_mm_sync_core_before_usermode(struct mm_struct *mm){}static inline void membarrier_update_current_mm(struct mm_struct *next_mm){}#endif
#endif /* _LINUX_SCHED_MM_H */