#include #include #include #include "internal.h" /* * /proc/self: */ static const char *proc_self_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done) { struct pid_namespace *ns = inode->i_sb->s_fs_info; pid_t tgid = task_tgid_nr_ns(current, ns); char *name; if (!tgid) return ERR_PTR(-ENOENT); /* 11 for max length of signed int in decimal + NULL term */ name = kmalloc(12, dentry ? GFP_KERNEL : GFP_ATOMIC); if (unlikely(!name)) return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); sprintf(name, "%d", tgid); set_delayed_call(done, kfree_link, name); return name; } static const struct inode_operations proc_self_inode_operations = { .get_link = proc_self_get_link, }; static unsigned self_inum; int proc_setup_self(struct super_block *s) { struct inode *root_inode = d_inode(s->s_root); struct pid_namespace *ns = s->s_fs_info; struct dentry *self; inode_lock(root_inode); self = d_alloc_name(s->s_root, "self"); if (self) { struct inode *inode = new_inode_pseudo(s); if (inode) { inode->i_ino = self_inum; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); inode->i_mode = S_IFLNK | S_IRWXUGO; inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; inode->i_op = &proc_self_inode_operations; d_add(self, inode); } else { dput(self); self = ERR_PTR(-ENOMEM); } } else { self = ERR_PTR(-ENOMEM); } inode_unlock(root_inode); if (IS_ERR(self)) { pr_err("proc_fill_super: can't allocate /proc/self\n"); return PTR_ERR(self); } ns->proc_self = self; return 0; } void __init proc_self_init(void) { proc_alloc_inum(&self_inum); } '/cgit.cgi/linux/net-next.git/log/include/uapi/drm/nouveau_drm.h'>logtreecommitdiff
path: root/include/uapi/drm/nouveau_drm.h
diff options
context:
space:
mode:
authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /include/uapi/drm/nouveau_drm.h
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi/drm/nouveau_drm.h')