Merge branch 'master' into for-next

3 files changed, 48 insertions, 46 deletions

diff --git a/init/Kconfig b/init/Kconfig
index cb0b2051bbb..3da09dab537 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -515,21 +515,6 @@ config RCU_BOOST_DELAY
 
           Accept the default if unsure.
 
-config SRCU_SYNCHRONIZE_DELAY
-        int "Microseconds to delay before waiting for readers"
-        range 0 20
-        default 10
-        help
-          This option controls how long SRCU delays before entering its
-          loop waiting on SRCU readers.  The purpose of this loop is
-          to avoid the unconditional context-switch penalty that would
-          otherwise be incurred if there was an active SRCU reader,
-          in a manner similar to adaptive locking schemes.  This should
-          be set to be a bit longer than the common-case SRCU read-side
-          critical-section overhead.
-
-          Accept the default if unsure.
-
 endmenu # "RCU Subsystem"
 
 config IKCONFIG
@@ -760,8 +745,8 @@ config DEBUG_BLK_CGROUP
 endif # CGROUPS
 
 menuconfig NAMESPACES
-        bool "Namespaces support" if EMBEDDED
-        default !EMBEDDED
+        bool "Namespaces support" if EXPERT
+        default !EXPERT
         help
           Provides the way to make tasks work with different objects using
           the same id. For example same IPC id may refer to different objects
@@ -914,23 +899,31 @@ config SYSCTL
 config ANON_INODES
         bool
 
-menuconfig EMBEDDED
-        bool "Configure standard kernel features (for small systems)"
+menuconfig EXPERT
+        bool "Configure standard kernel features (expert users)"
         help
           This option allows certain base kernel options and settings
           to be disabled or tweaked. This is for specialized
           environments which can tolerate a "non-standard" kernel.
           Only use this if you really know what you are doing.
 
+config EMBEDDED
+        bool "Embedded system"
+        select EXPERT
+        help
+          This option should be enabled if compiling the kernel for
+          an embedded system so certain expert options are available
+          for configuration.
+
 config UID16
-        bool "Enable 16-bit UID system calls" if EMBEDDED
+        bool "Enable 16-bit UID system calls" if EXPERT
         depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
         default y
         help
           This enables the legacy 16-bit UID syscall wrappers.
 
 config SYSCTL_SYSCALL
-        bool "Sysctl syscall support" if EMBEDDED
+        bool "Sysctl syscall support" if EXPERT
         depends on PROC_SYSCTL
         default y
         select SYSCTL
@@ -947,7 +940,7 @@ config SYSCTL_SYSCALL
           If unsure say Y here.
 
 config KALLSYMS
-         bool "Load all symbols for debugging/ksymoops" if EMBEDDED
+         bool "Load all symbols for debugging/ksymoops" if EXPERT
          default y
          help
            Say Y here to let the kernel print out symbolic crash information and
@@ -978,7 +971,7 @@ config KALLSYMS_EXTRA_PASS
 
 
 config HOTPLUG
-        bool "Support for hot-pluggable devices" if EMBEDDED
+        bool "Support for hot-pluggable devices" if EXPERT
         default y
         help
           This option is provided for the case where no hotplug or uevent
@@ -988,7 +981,7 @@ config HOTPLUG
 
 config PRINTK
         default y
-        bool "Enable support for printk" if EMBEDDED
+        bool "Enable support for printk" if EXPERT
         help
           This option enables normal printk support. Removing it
           eliminates most of the message strings from the kernel image
@@ -997,7 +990,7 @@ config PRINTK
           strongly discouraged.
 
 config BUG
-        bool "BUG() support" if EMBEDDED
+        bool "BUG() support" if EXPERT
         default y
         help
           Disabling this option eliminates support for BUG and WARN, reducing
@@ -1008,12 +1001,12 @@ config BUG
 
 config ELF_CORE
         default y
-        bool "Enable ELF core dumps" if EMBEDDED
+        bool "Enable ELF core dumps" if EXPERT
         help
           Enable support for generating core dumps. Disabling saves about 4k.
 
 config PCSPKR_PLATFORM
-        bool "Enable PC-Speaker support" if EMBEDDED
+        bool "Enable PC-Speaker support" if EXPERT
         depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
         default y
         help
@@ -1022,14 +1015,14 @@ config PCSPKR_PLATFORM
 
 config BASE_FULL
         default y
-        bool "Enable full-sized data structures for core" if EMBEDDED
+        bool "Enable full-sized data structures for core" if EXPERT
         help
           Disabling this option reduces the size of miscellaneous core
           kernel data structures. This saves memory on small machines,
           but may reduce performance.
 
 config FUTEX
-        bool "Enable futex support" if EMBEDDED
+        bool "Enable futex support" if EXPERT
         default y
         select RT_MUTEXES
         help
@@ -1038,7 +1031,7 @@ config FUTEX
           run glibc-based applications correctly.
 
 config EPOLL
-        bool "Enable eventpoll support" if EMBEDDED
+        bool "Enable eventpoll support" if EXPERT
         default y
         select ANON_INODES
         help
@@ -1046,7 +1039,7 @@ config EPOLL
           support for epoll family of system calls.
 
 config SIGNALFD
-        bool "Enable signalfd() system call" if EMBEDDED
+        bool "Enable signalfd() system call" if EXPERT
         select ANON_INODES
         default y
         help
@@ -1056,7 +1049,7 @@ config SIGNALFD
           If unsure, say Y.
 
 config TIMERFD
-        bool "Enable timerfd() system call" if EMBEDDED
+        bool "Enable timerfd() system call" if EXPERT
         select ANON_INODES
         default y
         help
@@ -1066,7 +1059,7 @@ config TIMERFD
           If unsure, say Y.
 
 config EVENTFD
-        bool "Enable eventfd() system call" if EMBEDDED
+        bool "Enable eventfd() system call" if EXPERT
         select ANON_INODES
         default y
         help
@@ -1076,7 +1069,7 @@ config EVENTFD
           If unsure, say Y.
 
 config SHMEM
-        bool "Use full shmem filesystem" if EMBEDDED
+        bool "Use full shmem filesystem" if EXPERT
         default y
         depends on MMU
         help
@@ -1087,7 +1080,7 @@ config SHMEM
           which may be appropriate on small systems without swap.
 
 config AIO
-        bool "Enable AIO support" if EMBEDDED
+        bool "Enable AIO support" if EXPERT
         default y
         help
           This option enables POSIX asynchronous I/O which may by used
@@ -1164,16 +1157,16 @@ endmenu
 
 config VM_EVENT_COUNTERS
         default y
-        bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
+        bool "Enable VM event counters for /proc/vmstat" if EXPERT
         help
           VM event counters are needed for event counts to be shown.
           This option allows the disabling of the VM event counters
-          on EMBEDDED systems.  /proc/vmstat will only show page counts
+          on EXPERT systems.  /proc/vmstat will only show page counts
           if VM event counters are disabled.
 
 config PCI_QUIRKS
         default y
-        bool "Enable PCI quirk workarounds" if EMBEDDED
+        bool "Enable PCI quirk workarounds" if EXPERT
         depends on PCI
         help
           This enables workarounds for various PCI chipset
@@ -1182,7 +1175,7 @@ config PCI_QUIRKS
 
 config SLUB_DEBUG
         default y
-        bool "Enable SLUB debugging support" if EMBEDDED
+        bool "Enable SLUB debugging support" if EXPERT
         depends on SLUB && SYSFS
         help
           SLUB has extensive debug support features. Disabling these can
@@ -1226,7 +1219,7 @@ config SLUB
            a slab allocator.
 
 config SLOB
-        depends on EMBEDDED
+        depends on EXPERT
         bool "SLOB (Simple Allocator)"
         help
            SLOB replaces the stock allocator with a drastically simpler
@@ -1237,7 +1230,7 @@ endchoice
 
 config MMAP_ALLOW_UNINITIALIZED
         bool "Allow mmapped anonymous memory to be uninitialized"
-        depends on EMBEDDED && !MMU
+        depends on EXPERT && !MMU
         default n
         help
           Normally, and according to the Linux spec, anonymous memory obtained
diff --git a/init/calibrate.c b/init/calibrate.c
index 6eb48e53d61..24fe022c55f 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -66,7 +66,7 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
                 pre_start = 0;
                 read_current_timer(&start);
                 start_jiffies = jiffies;
-                while (jiffies <= (start_jiffies + 1)) {
+                while (time_before_eq(jiffies, start_jiffies + 1)) {
                         pre_start = start;
                         read_current_timer(&start);
                 }
@@ -74,8 +74,8 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
 
                 pre_end = 0;
                 end = post_start;
-                while (jiffies <=
-                       (start_jiffies + 1 + DELAY_CALIBRATION_TICKS)) {
+                while (time_before_eq(jiffies, start_jiffies + 1 +
+                                               DELAY_CALIBRATION_TICKS)) {
                         pre_end = end;
                         read_current_timer(&end);
                 }
diff --git a/init/main.c b/init/main.c
index 00799c1d462..33c37c379e9 100644
--- a/init/main.c
+++ b/init/main.c
@@ -96,6 +96,15 @@ static inline void mark_rodata_ro(void) { }
 extern void tc_init(void);
 #endif
 
+/*
+ * Debug helper: via this flag we know that we are in 'early bootup code'
+ * where only the boot processor is running with IRQ disabled.  This means
+ * two things - IRQ must not be enabled before the flag is cleared and some
+ * operations which are not allowed with IRQ disabled are allowed while the
+ * flag is set.
+ */
+bool early_boot_irqs_disabled __read_mostly;
+
 enum system_states system_state __read_mostly;
 EXPORT_SYMBOL(system_state);
 
@@ -554,7 +563,7 @@ asmlinkage void __init start_kernel(void)
         cgroup_init_early();
 
         local_irq_disable();
-        early_boot_irqs_off();
+        early_boot_irqs_disabled = true;
 
 /*
  * Interrupts are still disabled. Do necessary setups, then
@@ -621,7 +630,7 @@ asmlinkage void __init start_kernel(void)
         if (!irqs_disabled())
                 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
                                  "enabled early\n");
-        early_boot_irqs_on();
+        early_boot_irqs_disabled = false;
         local_irq_enable();
 
         /* Interrupts are enabled now so all GFP allocations are safe. */