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Question related to nfs(network file system) in linux kernel.
by Sivakumar V May 13, 2014

May 13, 2014

Hi All, I want a requirement to intercept rpc call to nfs(network file system) or get hold of nfs buffer in kernel space and get data from the buffer to print it. I went through the kernel code .But i didn't get it .I am beginner in linux kernel. Please give your suggestions. Thanks in Advance. Siva Kumar

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Problem with inserting nfs module in kernel
by Sivakumar V May 12, 2014

May 12, 2014

Hi All, I am tried to compile and install (network file system)nfs module to kernel i.e. modified nfs code(inserted printk's in kernel nfs code) without compiling entire kernel . It is inserted but when configuring nfs the mount command crashes. i.e. mount -t nfs 172.16.10.44:/tmp /home/user/ddd can anyone know why it happens? Is there any way to do this Thanks in advance

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Questions about development-process
by David Matlack May 12, 2014

May 12, 2014

I have some questions after reading Documentation/development-process/. 1. According to 2.Process, after the merge window closes... Over the next six to ten weeks, only patches which fix problems should be submitted to the mainline. On occasion a more significant change will be allowed, but such occasions are rare; developers who try to merge new features outside of the merge window tend to get an unfriendly reception. So is "submitting to mainline" == "sending patches to LKML"? I'm basically confused if the development process is talking about when to send patches or just when Linus will merge patches into his tree. (...or both?) 2. How does the development process apply to the staging directory? Can I send new features and bug fixes alike for drivers/staging/X at any time or should I separate out patches as: - new features for drivers/staging/X sent only during merge window - bug fixes sent whenever Thanks! --David

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problem with adding system call!
by Nada Saif May 12, 2014

May 12, 2014

Hi linux folk , I'm trying to add simple linux system call - I received the following error : "No rule to make target 'block ..." I use kernel 2.6.32 .. My system call called "YourFirstName" Any suggestion to solve the issue ? Thanks, Nada

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Custom Kernel Compiling
by Prasad Ram May 12, 2014

May 12, 2014

Hi i am new to Linux Kernel I am using ubuntu 12.04. Recently i downloaded the latest kernel 3.15-rc3 and build it using this tutorial <http://kernelnewbies.org/KernelBuild>.Even though i am successfully boot that kernel i would like to know how to choose other kernels which are already installed on your system to boot. And how to create kernel image by using sources which are inside /usr/src/ in your system. Thank you .

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Fwd: Can a Bottom half be scheduled from a kernel thread
by Vishwas Srivastava May 12, 2014

May 12, 2014

Hi All, This may sound a dumb question. I just want to know if a tasklet can be scheduled from a kernel thread. what are the pros and crons of doing so? thanks, Vishwas S

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(no subject)
by Sivakumar V May 12, 2014

May 12, 2014

Hi All, I am tried to compile and install (network file system)nfs module to kernel i.e. modified nfs code(inserted printk's in kernel nfs code) without compiling entire kernel . It is inserted but when configuring nfs

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large frame size warning when compiling
by Jay Aurabind May 10, 2014

May 10, 2014

Hello list, Time for a noob discussion, When I was building the kernel, I found a warning from drivers/mfd/abx500-core.c, that the Frame size is larger than 1024 bytes. Apparently the stack frame size can be changed from the config, but my question is, whether 1024 bytes low ? I am on an x86_64 (core i3). abx500-core.c had an object of struct device being allocated on stack. So dynamically allocating it makes the warning go away. Are there any implications on using dynamic allocation on this particular code? I mean, could there be some reason why the original developer went with static option ? --- drivers/mfd/abx500-core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/mfd/abx500-core.c b/drivers/mfd/abx500-core.c index f3a15aa..709a84f 100644 --- a/drivers/mfd/abx500-core.c +++ b/drivers/mfd/abx500-core.c @@ -154,15 +154,17 @@ EXPORT_SYMBOL(abx500_startup_irq_enabled); void abx500_dump_all_banks(void) { struct abx500_ops *ops; - struct device dummy_child = {NULL}; + struct device *dummy_child; struct abx500_device_entry *dev_entry; + dummy_child = kzalloc(sizeof(struct device),GFP_KERNEL); + list_for_each_entry(dev_entry, &abx500_list, list) { - dummy_child.parent = dev_entry->dev; + dummy_child->parent = dev_entry->dev; ops = &dev_entry->ops; if ((ops != NULL) && (ops->dump_all_banks != NULL)) - ops->dump_all_banks(&dummy_child); + ops->dump_all_banks(dummy_child); } } EXPORT_SYMBOL(abx500_dump_all_banks); -- 1.9.1 -- Thanks and Regards, Jay Aurabind

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RTC battery saving mode?
by Woody Wu May 8, 2014

May 8, 2014

Hi, list Does anyone know in the RTC driver, is there any code that doing things like put RTC in a low battery consumption mode? Just a hardware engineer asked to do so on a RTC driver for an ARM926T powered SoC. -Woody Wu

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SSE register return with SSE disabled
by lx May 8, 2014

May 8, 2014

hi all: I'm complie the kernel.I do it by: ################################## make V=1 ################################## the error messages is: ################################## (cat /dev/null; ) > fs/sysfs/modules.order gcc -Wp,-MD,fs/.mbcache.o.d -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.1.2/include -I/opt/lx/kernel/kernel_test/kernel/linux/arch/x86/include -Iarch/x86/include/generated -Iinclude -I/opt/lx/kernel/kernel_test/kernel/linux/arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I/opt/lx/kernel/kernel_test/kernel/linux/include/uapi -Iinclude/generated/uapi -include /opt/lx/kernel/kernel_test/kernel/linux/include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Os -m64 -mno-mmx -mno-sse -mno-80387 -mno-fp-ret-in-387 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_CRC32=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -fno-stack-protector -fomit-frame-pointer -g -Wdeclaration-after-statement -Wno-pointer-sign -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(mbcache)" -D"KBUILD_MODNAME=KBUILD_STR(mbcache)" -c -o fs/.tmp_mbcache.o fs/mbcache.c fs/mbcache.c: In function ‘__spin_lock_mb_cache_entry’: fs/mbcache.c:134: error: SSE register return with SSE disabled make[1]: *** [fs/mbcache.o] Error 1 make: *** [fs] Error 2 ################################## I know beacause I use the gcc complie optaions of "-mmo-sse", the SSE is disables. The branch is: ################################## git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ################################## How to fix it? Thank you

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