Could you please help me to understand the "Kernel timer" behaviour during the below scenario(Assume the machine is 32bit machine) in 2.6.x kernels.

Scenario:
A Kernel timer's expiry value is initialized to "jiffies+8", when the jiffies value is "0xFFFFFFF0". This Kernel timer is added using add_timer() API after the jiffies wrap around(say the jiffies value is 0x01000000).

What time the Kernel timer's timeout function will be called in this scenario?

Hi All,

Could you please clarify below query related to USB auto suspend nad resume.

If we initiate resume immediatly after auto suspend, how hub driver will handle the port connected to the device.

Hi,

I am implementing suspend and resume methods in the USB client driver. I have done the following things.

1)I register a suspend and resume methods in usb_driver structure.
2)I am calling usb_autopm_pet_interface and usb_autopm_pet_interface functions in the open and release methods to change the pm_usage_cnt value in usb_interface structure.

The suspend method is not calling when the pm_usage_cnt=0 and the resume method also not calling when the pm_usage_cnt>0.

Is there any common suspend and resume methods which will be called by the usb core other than the suspend and resume methods registered by the client driver.

CONFIG_USB_SUSPEND is already enabled.

Please help me to find why the USB core is not calling the registered the suspend and resume methods.

I got the required information in powermanagement.txt in kernel doccumentation.

Hi,

I need to implement suspend and resume features in the USB client driver. Is there any prerequesites required from the gadget side?

Could you please help me.

Regards
Kumar

while understanding the interrupts, I saw the below line in hardirq.h.

#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)

Can anyone please tell me what is 1UL means in the above line.

Thanks in advance

Regards
Kumar

Hi All,

Could you please tell me what user context is?
It is the code running in kernel space on behalf of a user space process, is it correct?

Regards
Kumar

Hi,

Sorry for the late reply.

I tried to install glibc, but it is showing that it is already installed.

[root@localhost ]# yum install glibc
Loaded plugins: langpacks, presto, refresh-packagekit
Adding en_US to language list
Setting up Install Process
Package glibc-2.12.90-17.i686 already installed and latest version
Nothing to do
[root@localhost ]#

Hi,

Sorry for the late reply.

I tried with -lc_nonshared, but still it is showing the same error.

[root@localhost ]# make
gcc -static -o ../host_bin/watchdog ./watchdog.o -L ../Rlib/lib_host/ -lRhm -L ../Rlib/lib_host/ -lrtimer -lpthread_nonshared -lc_nonshared
/usr/bin/ld: cannot find -lc
collect2: ld returned 1 exit status
make: *** [../host_bin/watchdog] Error 1
[root@localhost ]#

Thanks very much.

Now I am not getting the lpthred message, but still I am getting the "can not find:lc" message. Could you please tell me how to resolve it.

[root@localhost ]# make
gcc -static -o ../host_bin/watchdog ./watchdog.o -L ../Rlib/lib_host/ -lRhm -L ../Rlib/lib_host/ -lrtimer -lpthread_nonshared
/usr/bin/ld: cannot find -lc
collect2: ld returned 1 exit status
make: *** [../host_bin/watchdog] Error 1
[root@localhost ]#