From 83c1fd763b3220458652f7d656d5047292ebcde4 Mon Sep 17 00:00:00 2001 From: zhangyiru Date: Mon, 8 Nov 2021 18:31:27 -0800 Subject: mm,hugetlb: remove mlock ulimit for SHM_HUGETLB Commit 21a3c273f88c ("mm, hugetlb: add thread name and pid to SHM_HUGETLB mlock rlimit warning") marked this as deprecated in 2012, but it is not deleted yet. Mike says he still sees that message in log files on occasion, so maybe we should preserve this warning. Also remove hugetlbfs related user_shm_unlock in ipc/shm.c and remove the user_shm_unlock after out. Link: https://lkml.kernel.org/r/20211103105857.25041-1-zhangyiru3@huawei.com Signed-off-by: zhangyiru Reviewed-by: Mike Kravetz Cc: Hugh Dickins Cc: Liu Zixian Cc: Michal Hocko Cc: wuxu.wu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hugetlbfs/inode.c | 23 ++++++++--------------- include/linux/hugetlb.h | 6 ++---- ipc/shm.c | 8 +------- mm/memfd.c | 4 +--- mm/mmap.c | 3 +-- 5 files changed, 13 insertions(+), 31 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index cdfb1ae78a3f..49d2e686be74 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -1446,8 +1446,8 @@ static int get_hstate_idx(int page_size_log) * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. */ struct file *hugetlb_file_setup(const char *name, size_t size, - vm_flags_t acctflag, struct ucounts **ucounts, - int creat_flags, int page_size_log) + vm_flags_t acctflag, int creat_flags, + int page_size_log) { struct inode *inode; struct vfsmount *mnt; @@ -1458,22 +1458,19 @@ struct file *hugetlb_file_setup(const char *name, size_t size, if (hstate_idx < 0) return ERR_PTR(-ENODEV); - *ucounts = NULL; mnt = hugetlbfs_vfsmount[hstate_idx]; if (!mnt) return ERR_PTR(-ENOENT); if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { - *ucounts = current_ucounts(); - if (user_shm_lock(size, *ucounts)) { - task_lock(current); - pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", + struct ucounts *ucounts = current_ucounts(); + + if (user_shm_lock(size, ucounts)) { + pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is obsolete\n", current->comm, current->pid); - task_unlock(current); - } else { - *ucounts = NULL; - return ERR_PTR(-EPERM); + user_shm_unlock(size, ucounts); } + return ERR_PTR(-EPERM); } file = ERR_PTR(-ENOSPC); @@ -1498,10 +1495,6 @@ struct file *hugetlb_file_setup(const char *name, size_t size, iput(inode); out: - if (*ucounts) { - user_shm_unlock(size, *ucounts); - *ucounts = NULL; - } return file; } diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 44c2ab0dfa59..00351ccb49a3 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -477,8 +477,7 @@ static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) extern const struct file_operations hugetlbfs_file_operations; extern const struct vm_operations_struct hugetlb_vm_ops; struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, - struct ucounts **ucounts, int creat_flags, - int page_size_log); + int creat_flags, int page_size_log); static inline bool is_file_hugepages(struct file *file) { @@ -497,8 +496,7 @@ static inline struct hstate *hstate_inode(struct inode *i) #define is_file_hugepages(file) false static inline struct file * hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, - struct ucounts **ucounts, int creat_flags, - int page_size_log) + int creat_flags, int page_size_log) { return ERR_PTR(-ENOSYS); } diff --git a/ipc/shm.c b/ipc/shm.c index ab749be6d8b7..4942bdd65748 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -287,9 +287,6 @@ static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) shm_unlock(shp); if (!is_file_hugepages(shm_file)) shmem_lock(shm_file, 0, shp->mlock_ucounts); - else if (shp->mlock_ucounts) - user_shm_unlock(i_size_read(file_inode(shm_file)), - shp->mlock_ucounts); fput(shm_file); ipc_update_pid(&shp->shm_cprid, NULL); ipc_update_pid(&shp->shm_lprid, NULL); @@ -650,8 +647,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) if (shmflg & SHM_NORESERVE) acctflag = VM_NORESERVE; file = hugetlb_file_setup(name, hugesize, acctflag, - &shp->mlock_ucounts, HUGETLB_SHMFS_INODE, - (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); + HUGETLB_SHMFS_INODE, (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); } else { /* * Do not allow no accounting for OVERCOMMIT_NEVER, even @@ -698,8 +694,6 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) no_id: ipc_update_pid(&shp->shm_cprid, NULL); ipc_update_pid(&shp->shm_lprid, NULL); - if (is_file_hugepages(file) && shp->mlock_ucounts) - user_shm_unlock(size, shp->mlock_ucounts); fput(file); ipc_rcu_putref(&shp->shm_perm, shm_rcu_free); return error; diff --git a/mm/memfd.c b/mm/memfd.c index 081dd33e6a61..9f80f162791a 100644 --- a/mm/memfd.c +++ b/mm/memfd.c @@ -297,9 +297,7 @@ SYSCALL_DEFINE2(memfd_create, } if (flags & MFD_HUGETLB) { - struct ucounts *ucounts = NULL; - - file = hugetlb_file_setup(name, 0, VM_NORESERVE, &ucounts, + file = hugetlb_file_setup(name, 0, VM_NORESERVE, HUGETLB_ANONHUGE_INODE, (flags >> MFD_HUGE_SHIFT) & MFD_HUGE_MASK); diff --git a/mm/mmap.c b/mm/mmap.c index b22a07f5e761..bfb0ea164a90 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1599,7 +1599,6 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, goto out_fput; } } else if (flags & MAP_HUGETLB) { - struct ucounts *ucounts = NULL; struct hstate *hs; hs = hstate_sizelog((flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK); @@ -1615,7 +1614,7 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, */ file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE, - &ucounts, HUGETLB_ANONHUGE_INODE, + HUGETLB_ANONHUGE_INODE, (flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK); if (IS_ERR(file)) return PTR_ERR(file); -- cgit v1.2.3-59-g8ed1b