latest kernel compile-- system panic
hi all i compiled latest kernel linux2.6.32.6 after 4 steps of make menuconfig make make modules make modules_install make install when i rebooted these error messages came Unable to access resume device (/dev/sda3) mount: could not find filesystem /dev/root' setuproot : moving /dev failed : No such file or directory setuproot : error mounting /proc : No such file or directory setuproot : error mounting /Sys : No such file or directory switchroot: mount failed No such file or directory earlier also whenever i compiled new kernel .. i used to copy the .config of old running kernel into new liinux folder as everytime if i create .config file with make menuconfig .. some unknown mistake gives kernel panic i need to know how to set proper .config so that it caters to all requirement of my present machine hardware i got to know make cloneconfig but it gives error as make[1]: *** No rule to make target `cloneconfig'. Stop. make: *** [cloneconfig] Error 2 will make oldconfig work ?? what to do Nidhi -- Thanks Regards Nidhi Mittal Hada
Re: latest kernel compile-- system panic
Hello This time also . i just copied the .config of my running kernel to the downloaded new kernel's directory and did make and further steps. and it executed successfully. no kernel panic. is it the right way .? But i helplessly do it as last resort everytime when after my all efforts new kernel panics on boot everytime. Nidhi On Thu, Jan 28, 2010 at 2:53 PM, nidhi mittal hada nidhimitta...@gmail.comwrote: hi all i compiled latest kernel linux2.6.32.6 after 4 steps of make menuconfig make make modules make modules_install make install when i rebooted these error messages came Unable to access resume device (/dev/sda3) mount: could not find filesystem /dev/root' setuproot : moving /dev failed : No such file or directory setuproot : error mounting /proc : No such file or directory setuproot : error mounting /Sys : No such file or directory switchroot: mount failed No such file or directory earlier also whenever i compiled new kernel .. i used to copy the .config of old running kernel into new liinux folder as everytime if i create .config file with make menuconfig .. some unknown mistake gives kernel panic i need to know how to set proper .config so that it caters to all requirement of my present machine hardware i got to know make cloneconfig but it gives error as make[1]: *** No rule to make target `cloneconfig'. Stop. make: *** [cloneconfig] Error 2 will make oldconfig work ?? what to do Nidhi -- Thanks Regards Nidhi Mittal Hada -- Thanks Regards Nidhi Mittal Hada
Re: module using another module
On 09 Dec 2009, at 12:09 PM, Matze wrote: From: Jason Nymble jason.nym...@gmail.com Date: 2009/12/8 Subject: module using another module To: kernelnewbies kernelnewbies@nl.linux.org What is the correct/ recommended way for one module to plug in to or use another module? e.g. if I have one module (call it A) which exports a symbol allowing a different module (call it B) to register (and unregister) a function pointer (which gets called by A if it has a valid value), it would be very good if A cannot unload while B is using it (registered), and also that B can unload without A being aware it has unregistered. The latter can simply be achieved by having B call the unregister function of A when it unloads. The former I suppose could be done via some sort of refcount scheme, but I'm sure this type of problem has a proper correct solution in the Linux kernel (e.g. all the modules that use the i2c module etc. etc.), and I'd obviously like to avoid re-inventing the wheel (badly). you can use modprobe for that reason. yust edit your modules.dep file so that loading module B will automatically load module A. Then the kernel don't let you unload A when B is still loaded. regards, Matthias Is there not a way to do this in the source of module B, so that depmod will automatically generate the modules.dep correctly? Note I don't necessarily want A to be autoloaded if B is being loaded (though that would obviously be nice), I just want to prevent A from being unloaded while B is loaded. For example, if one just looks at the output of lsmod, the used by column shows modules using other modules, and the ones that are used cannot be unloaded. How is this achieved? Perhaps it is as simple as: if module B uses any symbols exported from module A, then module A is automatically marked as being used by B while B is loaded, in which case one does not need to do anything? I've briefly looked at the source of a few of the modules of in the used by column, and I can't see them explicitly doing anything to lock the modules that they use, so I'm thinking this just happens automagically because they're using exported functions. -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Re: module using another module
On 28 Jan 2010, at 12:30 PM, Jason Nymble wrote: On 09 Dec 2009, at 12:09 PM, Matze wrote: From: Jason Nymble jason.nym...@gmail.com Date: 2009/12/8 Subject: module using another module To: kernelnewbies kernelnewbies@nl.linux.org What is the correct/ recommended way for one module to plug in to or use another module? e.g. if I have one module (call it A) which exports a symbol allowing a different module (call it B) to register (and unregister) a function pointer (which gets called by A if it has a valid value), it would be very good if A cannot unload while B is using it (registered), and also that B can unload without A being aware it has unregistered. The latter can simply be achieved by having B call the unregister function of A when it unloads. The former I suppose could be done via some sort of refcount scheme, but I'm sure this type of problem has a proper correct solution in the Linux kernel (e.g. all the modules that use the i2c module etc. etc.), and I'd obviously like to avoid re-inventing the wheel (badly). you can use modprobe for that reason. yust edit your modules.dep file so that loading module B will automatically load module A. Then the kernel don't let you unload A when B is still loaded. regards, Matthias Is there not a way to do this in the source of module B, so that depmod will automatically generate the modules.dep correctly? Note I don't necessarily want A to be autoloaded if B is being loaded (though that would obviously be nice), I just want to prevent A from being unloaded while B is loaded. For example, if one just looks at the output of lsmod, the used by column shows modules using other modules, and the ones that are used cannot be unloaded. How is this achieved? Perhaps it is as simple as: if module B uses any symbols exported from module A, then module A is automatically marked as being used by B while B is loaded, in which case one does not need to do anything? I've briefly looked at the source of a few of the modules of in the used by column, and I can't see them explicitly doing anything to lock the modules that they use, so I'm thinking this just happens automagically because they're using exported functions. Actually, I just tried the above with some minimal kernel modules that I made quickly, it does work that way. Awesome! So I don't really need to do anything special at all to prevent A from being unloaded, the very fact that B just references one of A's exported symbols is good enough. -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Re: latest kernel compile-- system panic
yes when i get unhinting errors -- i guessed something , changed a few params in .config and did make make modules so on but again same errors . finally i copied earlier running kernel's .config into this ...didnot do make menuconfig at all and in .config changed my required parameter of ext4 to be build as module. that's all now make , make modules , make modules_install , make install and it worked well now my ques is ...is it right what i am doing ... if not how to know correct parameter of .config isnt there some make someconfig instead of menuconfig which prepares correct .config file seeing hardware requirement on my pc or working kernel's .config file ... Please CMIIW anywhere. Nidhi On Thu, Jan 28, 2010 at 5:13 PM, Manish Katiyar mkati...@gmail.com wrote: On Thu, Jan 28, 2010 at 5:05 PM, waqar afridi afridi.wa...@gmail.com wrote: I used to get these errors when I started with kernel compilation and by this I mean a few weeks back. Where do u put the kernel source when you compile it, I used to download it and extract it to my home Directory and then the list of commands above, but it never worked. The Solution to this problem is to Extract the Kernel source to /usr/src/ and then do the above process (make etc), may be this will help... Where you put the kernel sources to build is not at all related to these panics (Otherwise you don't need a build symlink in your /lib/modules/version). Did you build the same config ? Thanks - Manish On Thu, Jan 28, 2010 at 3:25 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: Hello This time also . i just copied the .config of my running kernel to the downloaded new kernel's directory and did make and further steps. and it executed successfully. no kernel panic. is it the right way .? But i helplessly do it as last resort everytime when after my all efforts new kernel panics on boot everytime. Nidhi On Thu, Jan 28, 2010 at 2:53 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: hi all i compiled latest kernel linux2.6.32.6 after 4 steps of make menuconfig make make modules make modules_install make install when i rebooted these error messages came Unable to access resume device (/dev/sda3) mount: could not find filesystem /dev/root' setuproot : moving /dev failed : No such file or directory setuproot : error mounting /proc : No such file or directory setuproot : error mounting /Sys : No such file or directory switchroot: mount failed No such file or directory earlier also whenever i compiled new kernel .. i used to copy the .config of old running kernel into new liinux folder as everytime if i create .config file with make menuconfig .. some unknown mistake gives kernel panic i need to know how to set proper .config so that it caters to all requirement of my present machine hardware i got to know make cloneconfig but it gives error as make[1]: *** No rule to make target `cloneconfig'. Stop. make: *** [cloneconfig] Error 2 will make oldconfig work ?? what to do Nidhi -- Thanks Regards Nidhi Mittal Hada -- Thanks Regards Nidhi Mittal Hada -- Waqar Afridi Android Developer SERG IM|Sciences -- Thanks - Manish == [$\*.^ -- I miss being one of them == -- Thanks Regards Nidhi Mittal Hada
Re: latest kernel compile-- system panic
On Thu, Jan 28, 2010 at 5:05 PM, waqar afridi afridi.wa...@gmail.com wrote: I used to get these errors when I started with kernel compilation and by this I mean a few weeks back. Where do u put the kernel source when you compile it, I used to download it and extract it to my home Directory and then the list of commands above, but it never worked. The Solution to this problem is to Extract the Kernel source to /usr/src/ and then do the above process (make etc), may be this will help... Where you put the kernel sources to build is not at all related to these panics (Otherwise you don't need a build symlink in your /lib/modules/version). Did you build the same config ? Thanks - Manish On Thu, Jan 28, 2010 at 3:25 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: Hello This time also . i just copied the .config of my running kernel to the downloaded new kernel's directory and did make and further steps. and it executed successfully. no kernel panic. is it the right way .? But i helplessly do it as last resort everytime when after my all efforts new kernel panics on boot everytime. Nidhi On Thu, Jan 28, 2010 at 2:53 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: hi all i compiled latest kernel linux2.6.32.6 after 4 steps of make menuconfig make make modules make modules_install make install when i rebooted these error messages came Unable to access resume device (/dev/sda3) mount: could not find filesystem /dev/root' setuproot : moving /dev failed : No such file or directory setuproot : error mounting /proc : No such file or directory setuproot : error mounting /Sys : No such file or directory switchroot: mount failed No such file or directory earlier also whenever i compiled new kernel .. i used to copy the .config of old running kernel into new liinux folder as everytime if i create .config file with make menuconfig .. some unknown mistake gives kernel panic i need to know how to set proper .config so that it caters to all requirement of my present machine hardware i got to know make cloneconfig but it gives error as make[1]: *** No rule to make target `cloneconfig'. Stop. make: *** [cloneconfig] Error 2 will make oldconfig work ?? what to do Nidhi -- Thanks Regards Nidhi Mittal Hada -- Thanks Regards Nidhi Mittal Hada -- Waqar Afridi Android Developer SERG IM|Sciences -- Thanks - Manish == [$\*.^ -- I miss being one of them == -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Re: latest kernel compile-- system panic
On Thu, Jan 28, 2010 at 6:02 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: yes when i get unhinting errors -- i guessed something , changed a few params in .config and did make make modules so on but again same errors . finally i copied earlier running kernel's .config into this ...didnot do make menuconfig at all and in .config changed my required parameter of ext4 to be build as module. that's all now make , make modules , make modules_install , make install and it worked well now my ques is ...is it right what i am doing ... if not how to know correct parameter of .config isnt there some make someconfig instead of menuconfig which prepares correct .config file seeing hardware requirement on my pc or working kernel's .config file ... make oldconfig make help Please CMIIW anywhere. Nidhi On Thu, Jan 28, 2010 at 5:13 PM, Manish Katiyar mkati...@gmail.com wrote: On Thu, Jan 28, 2010 at 5:05 PM, waqar afridi afridi.wa...@gmail.com wrote: I used to get these errors when I started with kernel compilation and by this I mean a few weeks back. Where do u put the kernel source when you compile it, I used to download it and extract it to my home Directory and then the list of commands above, but it never worked. The Solution to this problem is to Extract the Kernel source to /usr/src/ and then do the above process (make etc), may be this will help... Where you put the kernel sources to build is not at all related to these panics (Otherwise you don't need a build symlink in your /lib/modules/version). Did you build the same config ? Thanks - Manish On Thu, Jan 28, 2010 at 3:25 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: Hello This time also . i just copied the .config of my running kernel to the downloaded new kernel's directory and did make and further steps. and it executed successfully. no kernel panic. is it the right way .? But i helplessly do it as last resort everytime when after my all efforts new kernel panics on boot everytime. Nidhi On Thu, Jan 28, 2010 at 2:53 PM, nidhi mittal hada nidhimitta...@gmail.com wrote: hi all i compiled latest kernel linux2.6.32.6 after 4 steps of make menuconfig make make modules make modules_install make install when i rebooted these error messages came Unable to access resume device (/dev/sda3) mount: could not find filesystem /dev/root' setuproot : moving /dev failed : No such file or directory setuproot : error mounting /proc : No such file or directory setuproot : error mounting /Sys : No such file or directory switchroot: mount failed No such file or directory earlier also whenever i compiled new kernel .. i used to copy the .config of old running kernel into new liinux folder as everytime if i create .config file with make menuconfig .. some unknown mistake gives kernel panic i need to know how to set proper .config so that it caters to all requirement of my present machine hardware i got to know make cloneconfig but it gives error as make[1]: *** No rule to make target `cloneconfig'. Stop. make: *** [cloneconfig] Error 2 will make oldconfig work ?? what to do Nidhi -- Thanks Regards Nidhi Mittal Hada -- Thanks Regards Nidhi Mittal Hada -- Waqar Afridi Android Developer SERG IM|Sciences -- Thanks - Manish == [$\*.^ -- I miss being one of them == -- Thanks Regards Nidhi Mittal Hada -- Thanks - Manish == [$\*.^ -- I miss being one of them == -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Sysfs Device Attributes: Subdirectory under subdirectory
Dear all, I want to create subdirectory under subdirectory in sysfs for a device. For example, if vhci_hcd is my device I want the following hierarchy: vhci_hcd | +-- status | +---0 || |+-- status || |+-- speed || |+-- device id || |+-- socket || |+-- busid | +---N | +-- status | +-- speed | +-- device id | +-- socket | +-- busid So, how do I create subdirectories 0 to N under status? I created attribute groups from 0 to N, how do I attach it to status and then in turn, status to vhci_hcd? Thanks in advance. Regards Himanshu -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Re: Sysfs Device Attributes: Subdirectory under subdirectory
On Fri, Jan 29, 2010 at 12:12:31AM +0530, Himanshu Chauhan wrote: Dear all, I want to create subdirectory under subdirectory in sysfs for a device. Ick, don't. For example, if vhci_hcd is my device I want the following hierarchy: vhci_hcd | +-- status | +---0 || |+-- status || |+-- speed || |+-- device id || |+-- socket || |+-- busid | +---N | +-- status | +-- speed | +-- device id | +-- socket | +-- busid No, you really do not want this. Why do you feel that you would want to create something that does not fit into the current driver/device model of the kernel? In short, what specifically are you trying to convey here? So, how do I create subdirectories 0 to N under status? I created attribute groups from 0 to N, how do I attach it to status and then in turn, status to vhci_hcd? What does these 0-N subdirectories represent? What does 'status' represent? Why would status have subdirectories? And why in that subdirectory would you have another file called status? totally confused, greg k-h -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
Re: Sysfs Device Attributes: Subdirectory under subdirectory
On Thu, Jan 28, 2010 at 01:11:36PM -0800, Greg KH wrote: On Fri, Jan 29, 2010 at 12:12:31AM +0530, Himanshu Chauhan wrote: Dear all, I want to create subdirectory under subdirectory in sysfs for a device. Ick, don't. For example, if vhci_hcd is my device I want the following hierarchy: vhci_hcd | +-- status | +---0 || |+-- status || |+-- speed || |+-- device id || |+-- socket || |+-- busid | +---N | +-- status | +-- speed | +-- device id | +-- socket | +-- busid No, you really do not want this. Why do you feel that you would want to create something that does not fit into the current driver/device model of the kernel? In short, what specifically are you trying to convey here? Hi Greg, There are 8 ports exported by VHCI. So I want to group the attributes of each port together. 0 to N are the port numbers. All attributes of port zero will be under 0 and all attributes of port 1 will be under 1 and so on. So, how do I create subdirectories 0 to N under status? I created attribute groups from 0 to N, how do I attach it to status and then in turn, status to vhci_hcd? What does these 0-N subdirectories represent? What does 'status' represent? Why would status have subdirectories? status under VHCI should rather be port_status. So hierarcy would be VHCI_HCD-port_status-port_number[0-8]-attributes And why in that subdirectory would you have another file called status? Status is the status of the port if its connected to the stub on the server. If this is not good, what would be the best layout? Regards Himanshu -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
DMA reordering possible ?
Hi all, Following questions can be of naïve nature. Kindly, help me to clarify the points. Thanks in Advance. 1) Consider a situation where a PCIe device has requested a DMA Write operation followed by an MSI based interrupt. Upon receiving the interrupt, the software will read/check the DMAed data. Now, even if the device is guaranteeing the ordering between the two (issuing one after the other), whether the I/O controller OR chipset can reorder/buffer them? This may result into getting interrupt before the data is DMAed resulting into software reading invalid data. Here data is residing into internal buffers of I/O controller and CPU is trying to read from memory. Whether such DMA reordering can happen/is allowed at all? Whether I/O controller can employ such intelligence(any kind of DMA reordering) for gaining some performance advantage? Mainly, focus is on high-end server class platforms having 8 or 16 cores with many peripherals. 2) If above situation is at all possible, then to avoid such situation is the responsibility of the device or the driver for that device? Mainly, both the components (device and driver) expected to be generic in nature (platform, I/O controller independent). 3) In continuation, if driver has to handle such situations, then how to handle such cases in Linux device driver? Any API is there for pending DMA flush/sync in I/O controller? I am aware of rmb(), wmb() mb() which ensures ordering from CPU side i.e. slave read/writes. Anythings similar for DMA operations ? Kindly, update me if i am missing something. Any info,link or reference will be of great help. Thanks and Regards, Yogeshwar -- To unsubscribe from this list: send an email with unsubscribe kernelnewbies to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
