Hi,
I am learning building arm64 kernel on:
https://wiki.linaro.org/HowTo/BuildArm64Kernel
I followed the page and started the kernel, because I didn't indicate a mmc
deivce,
the console outputs as below:
VFS: Cannot open root device "vda2" or unknown-block(254,2): error -6
Please append a correct "root=" boot option; here are the available
partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(254,2)
I had download the pre-built root filesystem, but I don't know how to use
it.
Could anyone tell me how to mount rootfs? Thank you!
--
Regards,
Zhi-zhou
The cpu_load decays on time according past cpu load of rq. The sched_avg also decays tasks' load on time. Now we has 2 kind decay for cpu_load. That is a kind of redundancy. And increase the system load by decay calculation. This patch try to remove the cpu_load decay.
There are 5 load_idx used for cpu_load in sched_domain. busy_idx and idle_idx are not zero usually, but newidle_idx, wake_idx and forkexec_idx are all zero on every arch. A shortcut to remove cpu_Load decay in the first patch. just one line patch for this change.
V2,
1, This version do some tuning on load bias of target load, to maximum match current code logical.
2, Got further to remove the cpu_load in rq.
3, Revert the patch 'Limit sd->*_idx range on sysctl' since no needs
Any testing/comments are appreciated.
This patch rebase on latest tip/master.
The git tree for this patchset at:
git@github.com:alexshi/power-scheduling.git noload
Thanks
Alex
Patches adding support for hibernation on ARM
- ARM hibernation / suspend-to-disk
- Fix hang in freeze_processes during hibernation
- add an irq disabled version of soft_restart
Patches based on v3.13 tag, verified hibernation on beaglebone black on a branch
based on 3.13 merged with initial omap support from Russ Dill which be found here:
http://git.linaro.org/git-ro/people/sebastian.capella/linux.git hibernation_3.13_russMerge
(includes v1 patchset)
[PATCH v2 1/3] ARM: Add irq disabled version of soft_restart.
arch/arm/include/asm/system_misc.h | 1 +
arch/arm/kernel/process.c | 15 ++++++++++-----
2 files changed, 11 insertions(+), 5 deletions(-)
Adds the ability to run soft restart with local_irq/fiq_disable
Useful in hibernation code paths (unchanged from v1)
[PATCH v2 2/3] Fix hibernation restore hang in freeze_processes
drivers/base/firmware_class.c | 1 +
1 file changed, 1 insertion(+)
Add handling for PM_RESTORE_PREPARE notifier (unchanged from v1)
[PATCH v2 3/3] ARM hibernation / suspend-to-disk
arch/arm/include/asm/memory.h | 1 +
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/hibernate.c | 104 +++++++++++++++++++++++++++++++++++++++++
arch/arm/mm/Kconfig | 5 ++
include/linux/suspend.h | 2 +
5 files changed, 113 insertions(+)
Adds support for ARM based hibernation
Additional notes:
-----------------
There are two checkpatch warnings added by this patch. These follow
behavior in existing hibernation implementations on other platforms.
WARNING: externs should be avoided in .c files
#116: FILE: arch/arm/kernel/hibernate.c:26:
+extern const void __nosave_begin, __nosave_end;
This extern is picking up the linker nosave region definitions, only
used in hibernate. Follows same extern line used mips, powerpc, s390,
sh, sparc, x86 & unicore32
WARNING: externs should be avoided in .c files
#191: FILE: arch/arm/kernel/hibernate.c:101:
+extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
This extern is used in the arch/arm/ in hibernate, process and bL_switcher
Changes in v2:
--------------
* Removed unneeded flush_thread, use of __naked and cpu_init.
* dropped Cyril Chemparathy <cyril(a)ti.com> from Cc: list as
emails are bouncing.
Patchset related to hibernation resume:
- enhancement to make the use of an existing resume file more general
Patch is based on the 3.13 tag. This was tested on a Beaglebone black
with partial hibernation support, also compiled for x86_64.
[PATCH v9 1/1] PM / Hibernate: use name_to_dev_t to parse resume
kernel/power/hibernate.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
Use name_to_dev_t to parse the /sys/power/resume file making the
syntax more flexible. It supports the previous use syntax
and additionally can support other formats such as
/dev/devicenode and UUID= formats.
By changing /sys/debug/resume to accept the same syntax as
the resume=device parameter, we can parse the resume=device
in the initrd init script and use the resume device directly
from the kernel command line.
Changes in v9:
--------------
* Dropped util changes based on feedback
* Reverted to handling newlines in resume_store
Changes in v8:
--------------
* Dropped cleanup checkpatch warnings in hibernate.c file
* Review comments for more compact checking in hibernate.c
Changes in v7:
--------------
* Switch to trim only one trailing newline if present using kstrdup_trimnl
* remove kstrimdup patch
* add kstrdup_trimnl patch
* Add clean up patch for kernel/power/hibernate.c checkpatch warnings
Changes in v6:
--------------
* Revert tricky / confusing while loop indexing
Changes in v5:
--------------
* Change kstrimdup to minimize allocated memory. Now allocates only
the memory needed for the string instead of using strim.
Changes in v4:
--------------
* Dropped name_to_dev_t rework in favor of adding kstrimdup
* adjusted resume_store
Changes in v3:
--------------
* Dropped documentation patch as it went in through trivial
* Added patch for name_to_dev_t to support directly parsing userspace
buffer
Changes in v2:
--------------
* Added check for null return of kstrndup in hibernate.c
Thanks,
Sebastian
From: Mark Brown <broonie(a)linaro.org>
On systems which were not booted using DT it is entirely unsurprising that
device nodes don't have any DT information and this is going to happen for
every single device in the system. Make pinctrl be less chatty about this
situation by only logging in the case where we have DT.
Signed-off-by: Mark Brown <broonie(a)linaro.org>
---
drivers/pinctrl/devicetree.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index 340fb4e6c600..eda13de2e7c0 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -186,7 +186,9 @@ int pinctrl_dt_to_map(struct pinctrl *p)
/* CONFIG_OF enabled, p->dev not instantiated from DT */
if (!np) {
- dev_dbg(p->dev, "no of_node; not parsing pinctrl DT\n");
+ if (of_have_populated_dt())
+ dev_dbg(p->dev,
+ "no of_node; not parsing pinctrl DT\n");
return 0;
}
--
1.9.rc1
This patchset creates/calls cpufreq suspend/resume callbacks from dpm_{suspend|resume}()
for handling suspend/resume of cpufreq governors and core.
There are multiple problems that are fixed by this patch:
- Nishanth Menon (TI) found an interesting problem on his platform, OMAP. His board
wasn't working well with suspend/resume as calls for removing non-boot CPUs
was turning out into a call to drivers ->target() which then tries to play
with regulators. But regulators and their I2C bus were already suspended and
this resulted in a failure. Many platforms have such problems, samsung, tegra,
etc.. They solved it with driver specific PM notifiers where they used to
disable their driver's ->target() routine.
- Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found an issue where tunables
configuration for clusters/sockets with non-boot CPUs was getting lost after
suspend/resume, as we were notifying governors with CPUFREQ_GOV_POLICY_EXIT on
removal of the last cpu for that policy and so deallocating memory for
tunables. This is fixed by this patch as we don't allow any operation on
governors after device suspend and before device resume now.
This is already tested by few people and so incorporating their Tested-by as
well.
I have tested this again on latest stuff on my thinkpad for several
suspend/resume cycles.
Viresh Kumar (7):
cpufreq: suspend governors on system suspend/hibernate
cpufreq: suspend governors from dpm_{suspend|resume}()
cpufreq: call driver's suspend/resume for each policy
cpufreq: Implement cpufreq_generic_suspend()
cpufreq: exynos: Use cpufreq_generic_suspend()
cpufreq: s5pv210: Use cpufreq_generic_suspend()
cpufreq: Tegra: Use cpufreq_generic_suspend()
drivers/base/power/main.c | 5 ++
drivers/cpufreq/cpufreq.c | 133 ++++++++++++++++++++++----------------
drivers/cpufreq/exynos-cpufreq.c | 96 ++-------------------------
drivers/cpufreq/s5pv210-cpufreq.c | 49 +-------------
drivers/cpufreq/tegra-cpufreq.c | 46 ++-----------
include/linux/cpufreq.h | 11 ++++
6 files changed, 108 insertions(+), 232 deletions(-)
--
1.7.12.rc2.18.g61b472e
