Merge branch 'master' into x86/memblock

Conflicts & resolutions:

* arch/x86/xen/setup.c

	dc91c728fd "xen: allow extra memory to be in multiple regions"
	24aa07882b "memblock, x86: Replace memblock_x86_reserve/free..."

	conflicted on xen_add_extra_mem() updates.  The resolution is
	trivial as the latter just want to replace
	memblock_x86_reserve_range() with memblock_reserve().

* drivers/pci/intel-iommu.c

	166e9278a3f "x86/ia64: intel-iommu: move to drivers/iommu/"
	5dfe8660a3d "bootmem: Replace work_with_active_regions() with..."

	conflicted as the former moved the file under drivers/iommu/.
	Resolved by applying the chnages from the latter on the moved
	file.

* mm/Kconfig

	6661672053a "memblock: add NO_BOOTMEM config symbol"
	c378ddd53f9 "memblock, x86: Make ARCH_DISCARD_MEMBLOCK a config option"

	conflicted trivially.  Both added config options.  Just
	letting both add their own options resolves the conflict.

* mm/memblock.c

	d1f0ece6cdc "mm/memblock.c: small function definition fixes"
	ed7b56a799c "memblock: Remove memblock_memory_can_coalesce()"

	confliected.  The former updates function removed by the
	latter.  Resolution is trivial.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 54 insertions, 30 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
index b1d5a6174d65..baf2aebd6970 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -100,7 +100,7 @@ static int console_locked, console_suspended;
  * It is also used in interesting ways to provide interlocking in
  * console_unlock();.
  */
-static DEFINE_SPINLOCK(logbuf_lock);
+static DEFINE_RAW_SPINLOCK(logbuf_lock);
 
 #define LOG_BUF_MASK (log_buf_len-1)
 #define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK])
@@ -212,7 +212,7 @@ void __init setup_log_buf(int early)
                 return;
         }
 
-        spin_lock_irqsave(&logbuf_lock, flags);
+        raw_spin_lock_irqsave(&logbuf_lock, flags);
         log_buf_len = new_log_buf_len;
         log_buf = new_log_buf;
         new_log_buf_len = 0;
@@ -230,7 +230,7 @@ void __init setup_log_buf(int early)
         log_start -= offset;
         con_start -= offset;
         log_end -= offset;
-        spin_unlock_irqrestore(&logbuf_lock, flags);
+        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
 
         pr_info("log_buf_len: %d\n", log_buf_len);
         pr_info("early log buf free: %d(%d%%)\n",
@@ -318,8 +318,10 @@ static int check_syslog_permissions(int type, bool from_file)
                         return 0;
                 /* For historical reasons, accept CAP_SYS_ADMIN too, with a warning */
                 if (capable(CAP_SYS_ADMIN)) {
-                        WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
-                                 "but no CAP_SYSLOG (deprecated).\n");
+                        printk_once(KERN_WARNING "%s (%d): "
+                                 "Attempt to access syslog with CAP_SYS_ADMIN "
+                                 "but no CAP_SYSLOG (deprecated).\n",
+                                 current->comm, task_pid_nr(current));
                         return 0;
                 }
                 return -EPERM;
@@ -363,18 +365,18 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
                 if (error)
                         goto out;
                 i = 0;
-                spin_lock_irq(&logbuf_lock);
+                raw_spin_lock_irq(&logbuf_lock);
                 while (!error && (log_start != log_end) && i < len) {
                         c = LOG_BUF(log_start);
                         log_start++;
-                        spin_unlock_irq(&logbuf_lock);
+                        raw_spin_unlock_irq(&logbuf_lock);
                         error = __put_user(c,buf);
                         buf++;
                         i++;
                         cond_resched();
-                        spin_lock_irq(&logbuf_lock);
+                        raw_spin_lock_irq(&logbuf_lock);
                 }
-                spin_unlock_irq(&logbuf_lock);
+                raw_spin_unlock_irq(&logbuf_lock);
                 if (!error)
                         error = i;
                 break;
@@ -397,7 +399,7 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
                 count = len;
                 if (count > log_buf_len)
                         count = log_buf_len;
-                spin_lock_irq(&logbuf_lock);
+                raw_spin_lock_irq(&logbuf_lock);
                 if (count > logged_chars)
                         count = logged_chars;
                 if (do_clear)
@@ -414,12 +416,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
                         if (j + log_buf_len < log_end)
                                 break;
                         c = LOG_BUF(j);
-                        spin_unlock_irq(&logbuf_lock);
+                        raw_spin_unlock_irq(&logbuf_lock);
                         error = __put_user(c,&buf[count-1-i]);
                         cond_resched();
-                        spin_lock_irq(&logbuf_lock);
+                        raw_spin_lock_irq(&logbuf_lock);
                 }
-                spin_unlock_irq(&logbuf_lock);
+                raw_spin_unlock_irq(&logbuf_lock);
                 if (error)
                         break;
                 error = i;
@@ -530,6 +532,9 @@ static int __init ignore_loglevel_setup(char *str)
 }
 
 early_param("ignore_loglevel", ignore_loglevel_setup);
+module_param_named(ignore_loglevel, ignore_loglevel, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
+        "print all kernel messages to the console.");
 
 /*
  * Write out chars from start to end - 1 inclusive
@@ -590,9 +595,6 @@ static size_t log_prefix(const char *p, unsigned int *level, char *special)
                 /* multi digit including the level and facility number */
                 char *endp = NULL;
 
-                if (p[1] < '0' && p[1] > '9')
-                        return 0;
-
                 lev = (simple_strtoul(&p[1], &endp, 10) & 7);
                 if (endp == NULL || endp[0] != '>')
                         return 0;
@@ -687,7 +689,7 @@ static void zap_locks(void)
         oops_timestamp = jiffies;
 
         /* If a crash is occurring, make sure we can't deadlock */
-        spin_lock_init(&logbuf_lock);
+        raw_spin_lock_init(&logbuf_lock);
         /* And make sure that we print immediately */
         sema_init(&console_sem, 1);
 }
@@ -782,7 +784,7 @@ static inline int can_use_console(unsigned int cpu)
 static int console_trylock_for_printk(unsigned int cpu)
         __releases(&logbuf_lock)
 {
-        int retval = 0;
+        int retval = 0, wake = 0;
 
         if (console_trylock()) {
                 retval = 1;
@@ -795,12 +797,14 @@ static int console_trylock_for_printk(unsigned int cpu)
                  */
                 if (!can_use_console(cpu)) {
                         console_locked = 0;
-                        up(&console_sem);
+                        wake = 1;
                         retval = 0;
                 }
         }
         printk_cpu = UINT_MAX;
-        spin_unlock(&logbuf_lock);
+        if (wake)
+                up(&console_sem);
+        raw_spin_unlock(&logbuf_lock);
         return retval;
 }
 static const char recursion_bug_msg [] =
@@ -860,7 +864,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
         }
 
         lockdep_off();
-        spin_lock(&logbuf_lock);
+        raw_spin_lock(&logbuf_lock);
         printk_cpu = this_cpu;
 
         if (recursion_bug) {
@@ -1104,6 +1108,10 @@ static int __init console_suspend_disable(char *str)
         return 1;
 }
 __setup("no_console_suspend", console_suspend_disable);
+module_param_named(console_suspend, console_suspend_enabled,
+                bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(console_suspend, "suspend console during suspend"
+        " and hibernate operations");
 
 /**
  * suspend_console - suspend the console subsystem
@@ -1242,7 +1250,7 @@ void console_unlock(void)
 {
         unsigned long flags;
         unsigned _con_start, _log_end;
-        unsigned wake_klogd = 0;
+        unsigned wake_klogd = 0, retry = 0;
 
         if (console_suspended) {
                 up(&console_sem);
@@ -1251,15 +1259,16 @@ void console_unlock(void)
 
         console_may_schedule = 0;
 
+again:
         for ( ; ; ) {
-                spin_lock_irqsave(&logbuf_lock, flags);
+                raw_spin_lock_irqsave(&logbuf_lock, flags);
                 wake_klogd |= log_start - log_end;
                 if (con_start == log_end)
                         break;                  /* Nothing to print */
                 _con_start = con_start;
                 _log_end = log_end;
                 con_start = log_end;            /* Flush */
-                spin_unlock(&logbuf_lock);
+                raw_spin_unlock(&logbuf_lock);
                 stop_critical_timings();        /* don't trace print latency */
                 call_console_drivers(_con_start, _log_end);
                 start_critical_timings();
@@ -1271,8 +1280,23 @@ void console_unlock(void)
         if (unlikely(exclusive_console))
                 exclusive_console = NULL;
 
+        raw_spin_unlock(&logbuf_lock);
+
         up(&console_sem);
-        spin_unlock_irqrestore(&logbuf_lock, flags);
+
+        /*
+         * Someone could have filled up the buffer again, so re-check if there's
+         * something to flush. In case we cannot trylock the console_sem again,
+         * there's a new owner and the console_unlock() from them will do the
+         * flush, no worries.
+         */
+        raw_spin_lock(&logbuf_lock);
+        if (con_start != log_end)
+                retry = 1;
+        if (retry && console_trylock())
+                goto again;
+
+        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
         if (wake_klogd)
                 wake_up_klogd();
 }
@@ -1502,9 +1526,9 @@ void register_console(struct console *newcon)
                  * console_unlock(); will print out the buffered messages
                  * for us.
                  */
-                spin_lock_irqsave(&logbuf_lock, flags);
+                raw_spin_lock_irqsave(&logbuf_lock, flags);
                 con_start = log_start;
-                spin_unlock_irqrestore(&logbuf_lock, flags);
+                raw_spin_unlock_irqrestore(&logbuf_lock, flags);
                 /*
                  * We're about to replay the log buffer.  Only do this to the
                  * just-registered console to avoid excessive message spam to
@@ -1584,7 +1608,7 @@ static int __init printk_late_init(void)
         struct console *con;
 
         for_each_console(con) {
-                if (con->flags & CON_BOOT) {
+                if (!keep_bootcon && con->flags & CON_BOOT) {
                         printk(KERN_INFO "turn off boot console %s%d\n",
                                 con->name, con->index);
                         unregister_console(con);
@@ -1711,10 +1735,10 @@ void kmsg_dump(enum kmsg_dump_reason reason)
         /* Theoretically, the log could move on after we do this, but
            there's not a lot we can do about that. The new messages
            will overwrite the start of what we dump. */
-        spin_lock_irqsave(&logbuf_lock, flags);
+        raw_spin_lock_irqsave(&logbuf_lock, flags);
         end = log_end & LOG_BUF_MASK;
         chars = logged_chars;
-        spin_unlock_irqrestore(&logbuf_lock, flags);
+        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
 
         if (chars > end) {
                 s1 = log_buf + log_buf_len - chars + end;