linux-kernel

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Hello I have beagleboneblack board and have kernel source code I want to make my i2c work as a module so for that, I have done some changes in .config file # # I2C support # CONFIG_I2C=m and cross compile kernel make dtbs zImage -j8 CROSS_COMPILE=arm-linux-gnueabihf- But after compile successfully, CONFIG_I2C change from 'm' to 'y' how to solve this problem? 来源： https://stackoverflow.com/questions/62752609/how-to-make-i2c-core-as-module

问题 This bounty has ended . Answers to this question are eligible for a +50 reputation bounty. Bounty grace period ends in 12 hours . onetyone wants to draw more attention to this question. Background: I am working with a Pixel 4, build QQ2A.200501.001.B2 , which is Android 10. When I build the kernel from the official sources and flash it, the touchscreen, wlan and other features do not work. I tracked this down to the fact that the kernel modules in /vendor/lib/modules do not get updated, thus

问题 How to notify the user space application whenever an event occurs in the kernel space? A hardware generates an interrupt when the data arrives at some GPIO. This data is copied to the kernel buffer. At this point, I want the driver to notify the application that it can call read function to copy the data form kernel buffer to user space buffer. I thought of using epoll method, but epoll indicates whether the device is ready to be read from. What I want is that, epoll to indicate whenever

问题 As per my knowledge, In Linux file system, for information communication between user space and kernel space, two kind of virtual file systems are used. 1) Proc file system http://www.tldp.org/LDP/Linux-Filesystem-Hierarchy/html/proc.html 2) sysfs file system https://en.wikipedia.org/wiki/Sysfs In linux kernel code, i see some sub system has used proc file to perform such userspace-kernelspace communication, and some system has used sysfs files for same concern. So i just want to know, if i

问题 I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel activities. Unfortunately, I have realized that the Kernel Log Buffer size ( CONFIG_LOG_BUF_SHIFT ) cannot be more that 2^21 which is essentially equal to 2M entries. Is there any other way to record more than 2M Kernel messages ? 回答1: You can set the kernel log buffer to log_buf_len=4M in your

问题 I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel activities. Unfortunately, I have realized that the Kernel Log Buffer size ( CONFIG_LOG_BUF_SHIFT ) cannot be more that 2^21 which is essentially equal to 2M entries. Is there any other way to record more than 2M Kernel messages ? 回答1: You can set the kernel log buffer to log_buf_len=4M in your

问题 I was going through linux kernel 3.10, which has a function of_clk_init which is as below void __init of_clk_init(const struct of_device_id *matches) { struct device_node *np; if (!matches) matches = __clk_of_table; for_each_matching_node(np, matches) { const struct of_device_id *match = of_match_node(matches, np); of_clk_init_cb_t clk_init_cb = match->data; clk_init_cb(np); } } when i look for the symbol __clk_of_table i did not find any reference but i am very sure that __clk_of_table has