Seth/kernel_amazon_mt8127-common
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Merge commit '8700c95adb03' into timers/nohz

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The full dynticks tree needs the latest RCU and sched
upstream updates in order to fix some dependencies.

Merge a common upstream merge point that has these
updates.

Conflicts:
	include/linux/perf_event.h
	kernel/rcutree.h
	kernel/rcutree_plugin.h

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker
2013-05-02 17:37:49 +02:00
parent fda76e074c 8700c95adb
commit c032862fba
3692 changed files with 150969 additions and 120861 deletions
Download Patch File Download Diff File Expand all files Collapse all files
init/Kconfig
+57 -18
View File
@@ -28,10 +28,6 @@ config BUILDTIME_EXTABLE_SORT
menu "General setup"
config EXPERIMENTAL
bool
default y
config BROKEN
bool
@@ -583,13 +579,16 @@ config RCU_FAST_NO_HZ
depends on NO_HZ_COMMON && SMP
default n
help
This option causes RCU to attempt to accelerate grace periods in
order to allow CPUs to enter dynticks-idle state more quickly.
On the other hand, this option increases the overhead of the
dynticks-idle checking, thus degrading scheduling latency.
This option permits CPUs to enter dynticks-idle state even if
they have RCU callbacks queued, and prevents RCU from waking
these CPUs up more than roughly once every four jiffies (by
default, you can adjust this using the rcutree.rcu_idle_gp_delay
parameter), thus improving energy efficiency. On the other
hand, this option increases the duration of RCU grace periods,
for example, slowing down synchronize_rcu().
Say Y if energy efficiency is critically important, and you don't
care about real-time response.
Say Y if energy efficiency is critically important, and you
don't care about increased grace-period durations.
Say N if you are unsure.
@@ -656,7 +655,7 @@ config RCU_BOOST_DELAY
Accept the default if unsure.
config RCU_NOCB_CPU
bool "Offload RCU callback processing from boot-selected CPUs"
bool "Offload RCU callback processing from boot-selected CPUs (EXPERIMENTAL"
depends on TREE_RCU || TREE_PREEMPT_RCU
default n
help
@@ -667,16 +666,56 @@ config RCU_NOCB_CPU
This option offloads callback invocation from the set of
CPUs specified at boot time by the rcu_nocbs parameter.
For each such CPU, a kthread ("rcuoN") will be created to
invoke callbacks, where the "N" is the CPU being offloaded.
Nothing prevents this kthread from running on the specified
CPUs, but (1) the kthreads may be preempted between each
callback, and (2) affinity or cgroups can be used to force
the kthreads to run on whatever set of CPUs is desired.
For each such CPU, a kthread ("rcuox/N") will be created to
invoke callbacks, where the "N" is the CPU being offloaded,
and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and
"s" for RCU-sched. Nothing prevents this kthread from running
on the specified CPUs, but (1) the kthreads may be preempted
between each callback, and (2) affinity or cgroups can be used
to force the kthreads to run on whatever set of CPUs is desired.
Say Y here if you want reduced OS jitter on selected CPUs.
Say Y here if you want to help to debug reduced OS jitter.
Say N here if you are unsure.
choice
prompt "Build-forced no-CBs CPUs"
default RCU_NOCB_CPU_NONE
help
This option allows no-CBs CPUs to be specified at build time.
Additional no-CBs CPUs may be specified by the rcu_nocbs=
boot parameter.
config RCU_NOCB_CPU_NONE
bool "No build_forced no-CBs CPUs"
depends on RCU_NOCB_CPU
help
This option does not force any of the CPUs to be no-CBs CPUs.
Only CPUs designated by the rcu_nocbs= boot parameter will be
no-CBs CPUs.
config RCU_NOCB_CPU_ZERO
bool "CPU 0 is a build_forced no-CBs CPU"
depends on RCU_NOCB_CPU
help
This option forces CPU 0 to be a no-CBs CPU. Additional CPUs
may be designated as no-CBs CPUs using the rcu_nocbs= boot
parameter will be no-CBs CPUs.
Select this if CPU 0 needs to be a no-CBs CPU for real-time
or energy-efficiency reasons.
config RCU_NOCB_CPU_ALL
bool "All CPUs are build_forced no-CBs CPUs"
depends on RCU_NOCB_CPU
help
This option forces all CPUs to be no-CBs CPUs. The rcu_nocbs=
boot parameter will be ignored.
Select this if all CPUs need to be no-CBs CPUs for real-time
or energy-efficiency reasons.
endchoice
endmenu # "RCU Subsystem"
config IKCONFIG
init/main.c
+19 -27
View File
@@ -9,6 +9,8 @@
* Simplified starting of init: Michael A. Griffith <grif@acm.org>
*/
#define DEBUG /* Enable initcall_debug */
#include <linux/types.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
@@ -174,8 +176,8 @@ static int __init obsolete_checksetup(char *line)
if (line[n] == '\0' || line[n] == '=')
had_early_param = 1;
} else if (!p->setup_func) {
printk(KERN_WARNING "Parameter %s is obsolete,"
" ignored\n", p->str);
pr_warn("Parameter %s is obsolete, ignored\n",
p->str);
return 1;
} else if (p->setup_func(line + n))
return 1;
@@ -384,7 +386,7 @@ static noinline void __init_refok rest_init(void)
init_idle_bootup_task(current);
schedule_preempt_disabled();
/* Call into cpu_idle with preempt disabled */
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/* Check for early params. */
@@ -398,8 +400,7 @@ static int __init do_early_param(char *param, char *val, const char *unused)
strcmp(p->str, "earlycon") == 0)
) {
if (p->setup_func(val) != 0)
printk(KERN_WARNING
"Malformed early option '%s'\n", param);
pr_warn("Malformed early option '%s'\n", param);
}
}
/* We accept everything at this stage. */
@@ -497,7 +498,7 @@ asmlinkage void __init start_kernel(void)
tick_init();
boot_cpu_init();
page_address_init();
printk(KERN_NOTICE "%s", linux_banner);
pr_notice("%s", linux_banner);
setup_arch(&command_line);
mm_init_owner(&init_mm, &init_task);
mm_init_cpumask(&init_mm);
@@ -509,7 +510,7 @@ asmlinkage void __init start_kernel(void)
build_all_zonelists(NULL, NULL);
page_alloc_init();
printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
pr_notice("Kernel command line: %s\n", boot_command_line);
parse_early_param();
parse_args("Booting kernel", static_command_line, __start___param,
__stop___param - __start___param,
@@ -539,11 +540,8 @@ asmlinkage void __init start_kernel(void)
* fragile until we cpu_idle() for the first time.
*/
preempt_disable();
if (!irqs_disabled()) {
printk(KERN_WARNING "start_kernel(): bug: interrupts were "
"enabled *very* early, fixing it\n");
if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n"))
local_irq_disable();
}
idr_init_cache();
perf_event_init();
rcu_init();
@@ -559,9 +557,7 @@ asmlinkage void __init start_kernel(void)
time_init();
profile_init();
call_function_init();
if (!irqs_disabled())
printk(KERN_CRIT "start_kernel(): bug: interrupts were "
"enabled early\n");
WARN(!irqs_disabled(), "Interrupts were enabled early\n");
early_boot_irqs_disabled = false;
local_irq_enable();
@@ -588,8 +584,7 @@ asmlinkage void __init start_kernel(void)
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && !initrd_below_start_ok &&
page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
"disabling it.\n",
pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
page_to_pfn(virt_to_page((void *)initrd_start)),
min_low_pfn);
initrd_start = 0;
@@ -668,14 +663,14 @@ static int __init_or_module do_one_initcall_debug(initcall_t fn)
unsigned long long duration;
int ret;
printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current));
calltime = ktime_get();
ret = fn();
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
ret, duration);
pr_debug("initcall %pF returned %d after %lld usecs\n",
fn, ret, duration);
return ret;
}
@@ -703,9 +698,7 @@ int __init_or_module do_one_initcall(initcall_t fn)
strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
local_irq_enable();
}
if (msgbuf[0]) {
printk("initcall %pF returned with %s\n", fn, msgbuf);
}
WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
return ret;
}
@@ -833,8 +826,7 @@ static int __ref kernel_init(void *unused)
if (ramdisk_execute_command) {
if (!run_init_process(ramdisk_execute_command))
return 0;
printk(KERN_WARNING "Failed to execute %s\n",
ramdisk_execute_command);
pr_err("Failed to execute %s\n", ramdisk_execute_command);
}
/*
@@ -846,8 +838,8 @@ static int __ref kernel_init(void *unused)
if (execute_command) {
if (!run_init_process(execute_command))
return 0;
printk(KERN_WARNING "Failed to execute %s. Attempting "
"defaults...\n", execute_command);
pr_err("Failed to execute %s. Attempting defaults...\n",
execute_command);
}
if (!run_init_process("/sbin/init") ||
!run_init_process("/etc/init") ||
@@ -892,7 +884,7 @@ static noinline void __init kernel_init_freeable(void)
/* Open the /dev/console on the rootfs, this should never fail */
if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
printk(KERN_WARNING "Warning: unable to open an initial console.\n");
pr_err("Warning: unable to open an initial console.\n");
(void) sys_dup(0);
(void) sys_dup(0);