Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Minor comment merge conflict in mlx5.

Staging driver has a fixup due to the skb->xmit_more changes
in 'net-next', but was removed in 'net'.

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 70 insertions, 34 deletions

diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index 8974b3755670..3c18260403dd 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -162,10 +162,14 @@ static void cpu_map_kthread_stop(struct work_struct *work)
 static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
                                          struct xdp_frame *xdpf)
 {
+        unsigned int hard_start_headroom;
         unsigned int frame_size;
         void *pkt_data_start;
         struct sk_buff *skb;
 
+        /* Part of headroom was reserved to xdpf */
+        hard_start_headroom = sizeof(struct xdp_frame) +  xdpf->headroom;
+
         /* build_skb need to place skb_shared_info after SKB end, and
          * also want to know the memory "truesize".  Thus, need to
          * know the memory frame size backing xdp_buff.
@@ -183,15 +187,15 @@ static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
          * is not at a fixed memory location, with mixed length
          * packets, which is bad for cache-line hotness.
          */
-        frame_size = SKB_DATA_ALIGN(xdpf->len + xdpf->headroom) +
+        frame_size = SKB_DATA_ALIGN(xdpf->len + hard_start_headroom) +
                 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 
-        pkt_data_start = xdpf->data - xdpf->headroom;
+        pkt_data_start = xdpf->data - hard_start_headroom;
         skb = build_skb(pkt_data_start, frame_size);
         if (!skb)
                 return NULL;
 
-        skb_reserve(skb, xdpf->headroom);
+        skb_reserve(skb, hard_start_headroom);
         __skb_put(skb, xdpf->len);
         if (xdpf->metasize)
                 skb_metadata_set(skb, xdpf->metasize);
@@ -205,6 +209,9 @@ static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
          * - RX ring dev queue index    (skb_record_rx_queue)
          */
 
+        /* Allow SKB to reuse area used by xdp_frame */
+        xdp_scrub_frame(xdpf);
+
         return skb;
 }
 
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 2ada5e21dfa6..4a8f390a2b82 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -554,19 +554,6 @@ struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type typ
 }
 EXPORT_SYMBOL(bpf_prog_get_type_path);
 
-static void bpf_evict_inode(struct inode *inode)
-{
-        enum bpf_type type;
-
-        truncate_inode_pages_final(&inode->i_data);
-        clear_inode(inode);
-
-        if (S_ISLNK(inode->i_mode))
-                kfree(inode->i_link);
-        if (!bpf_inode_type(inode, &type))
-                bpf_any_put(inode->i_private, type);
-}
-
 /*
  * Display the mount options in /proc/mounts.
  */
@@ -579,11 +566,28 @@ static int bpf_show_options(struct seq_file *m, struct dentry *root)
         return 0;
 }
 
+static void bpf_destroy_inode_deferred(struct rcu_head *head)
+{
+        struct inode *inode = container_of(head, struct inode, i_rcu);
+        enum bpf_type type;
+
+        if (S_ISLNK(inode->i_mode))
+                kfree(inode->i_link);
+        if (!bpf_inode_type(inode, &type))
+                bpf_any_put(inode->i_private, type);
+        free_inode_nonrcu(inode);
+}
+
+static void bpf_destroy_inode(struct inode *inode)
+{
+        call_rcu(&inode->i_rcu, bpf_destroy_inode_deferred);
+}
+
 static const struct super_operations bpf_super_ops = {
         .statfs         = simple_statfs,
         .drop_inode     = generic_delete_inode,
         .show_options   = bpf_show_options,
-        .evict_inode    = bpf_evict_inode,
+        .destroy_inode  = bpf_destroy_inode,
 };
 
 enum {
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 2fe89138309a..b7ad8003c4e6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1898,8 +1898,9 @@ continue_func:
                 }
                 frame++;
                 if (frame >= MAX_CALL_FRAMES) {
-                        WARN_ONCE(1, "verifier bug. Call stack is too deep\n");
-                        return -EFAULT;
+                        verbose(env, "the call stack of %d frames is too deep !\n",
+                                frame);
+                        return -E2BIG;
                 }
                 goto process_func;
         }
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 025f419d16f6..6754f3ecfd94 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -564,6 +564,20 @@ static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st)
                 cpuhp_invoke_callback(cpu, st->state, false, NULL, NULL);
 }
 
+static inline bool can_rollback_cpu(struct cpuhp_cpu_state *st)
+{
+        if (IS_ENABLED(CONFIG_HOTPLUG_CPU))
+                return true;
+        /*
+         * When CPU hotplug is disabled, then taking the CPU down is not
+         * possible because takedown_cpu() and the architecture and
+         * subsystem specific mechanisms are not available. So the CPU
+         * which would be completely unplugged again needs to stay around
+         * in the current state.
+         */
+        return st->state <= CPUHP_BRINGUP_CPU;
+}
+
 static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
                               enum cpuhp_state target)
 {
@@ -574,8 +588,10 @@ static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
                 st->state++;
                 ret = cpuhp_invoke_callback(cpu, st->state, true, NULL, NULL);
                 if (ret) {
-                        st->target = prev_state;
-                        undo_cpu_up(cpu, st);
+                        if (can_rollback_cpu(st)) {
+                                st->target = prev_state;
+                                undo_cpu_up(cpu, st);
+                        }
                         break;
                 }
         }
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 771e93f9c43f..6f357f4fc859 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -29,6 +29,7 @@
 #include <linux/hw_breakpoint.h>
 #include <linux/cn_proc.h>
 #include <linux/compat.h>
+#include <linux/sched/signal.h>
 
 /*
  * Access another process' address space via ptrace.
@@ -924,18 +925,26 @@ int ptrace_request(struct task_struct *child, long request,
                         ret = ptrace_setsiginfo(child, &siginfo);
                 break;
 
-        case PTRACE_GETSIGMASK:
+        case PTRACE_GETSIGMASK: {
+                sigset_t *mask;
+
                 if (addr != sizeof(sigset_t)) {
                         ret = -EINVAL;
                         break;
                 }
 
-                if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))
+                if (test_tsk_restore_sigmask(child))
+                        mask = &child->saved_sigmask;
+                else
+                        mask = &child->blocked;
+
+                if (copy_to_user(datavp, mask, sizeof(sigset_t)))
                         ret = -EFAULT;
                 else
                         ret = 0;
 
                 break;
+        }
 
         case PTRACE_SETSIGMASK: {
                 sigset_t new_set;
@@ -961,6 +970,8 @@ int ptrace_request(struct task_struct *child, long request,
                 child->blocked = new_set;
                 spin_unlock_irq(&child->sighand->siglock);
 
+                clear_tsk_restore_sigmask(child);
+
                 ret = 0;
                 break;
         }
diff --git a/kernel/signal.c b/kernel/signal.c
index b7953934aa99..f98448cf2def 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3605,16 +3605,11 @@ SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
                 if (unlikely(sig != kinfo.si_signo))
                         goto err;
 
+                /* Only allow sending arbitrary signals to yourself. */
+                ret = -EPERM;
                 if ((task_pid(current) != pid) &&
-                    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL)) {
-                        /* Only allow sending arbitrary signals to yourself. */
-                        ret = -EPERM;
-                        if (kinfo.si_code != SI_USER)
-                                goto err;
-
-                        /* Turn this into a regular kill signal. */
-                        prepare_kill_siginfo(sig, &kinfo);
-                }
+                    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
+                        goto err;
         } else {
                 prepare_kill_siginfo(sig, &kinfo);
         }
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 403c9bd90413..6a5787233113 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -554,13 +554,15 @@ static void softlockup_start_all(void)
 
 int lockup_detector_online_cpu(unsigned int cpu)
 {
-        watchdog_enable(cpu);
+        if (cpumask_test_cpu(cpu, &watchdog_allowed_mask))
+                watchdog_enable(cpu);
         return 0;
 }
 
 int lockup_detector_offline_cpu(unsigned int cpu)
 {
-        watchdog_disable(cpu);
+        if (cpumask_test_cpu(cpu, &watchdog_allowed_mask))
+                watchdog_disable(cpu);
         return 0;
 }