Searching for Enable Dynamic Printk Call Support information? Find all needed info by using official links provided below.
https://elinux.org/Debugging_by_printing
For the early stages in the boot process, where no console is available yet, there is a special function named early_printk, this function writes directly to the VGA buffer or a serial line but otherwise works just like printk -- you have to enable this function by setting CONFIG_EARLY_PRINTK in your kernel config (make menuconfig -> Kernel ...
https://www.kernel.org/doc/html/v4.11/admin-guide/dynamic-debug-howto.html
Dynamic debug is designed to allow you to dynamically enable/disable kernel code to obtain additional kernel information. Currently, if CONFIG_DYNAMIC_DEBUG is set, then all pr_debug() / dev_dbg() and print_hex_dump_debug() / print_hex_dump_bytes() calls can be dynamically enabled per-callsite.
https://www.linux.org/threads/the-linux-kernel-configuring-the-kernel-part-22.9407/
Dec 08, 2013 · The printk() function can be made to print various debugging messages if this feature is enabled (Enable dynamic printk() support). “printk()” is a commonly discussed system call, so remember that it prints debugging messages about the kernel. Here is a Direct Memory Access (DMA) debugging driver (Enable debugging of DMA-API usage).
https://community.nxp.com/thread/60103
Dec 02, 2009 · By browsing the LTIB menus, I found out (by searching in kernel hacking the label CONFIG_DYNAMIC_PRINTK_DEBUG) that I could select enable dynamic printk() call support option. The fact is that this options is enabled by writing the modules names in a file called debugfs which should be located in dynamic_printk/modules. My questions are:Reviews: 3
https://www.linux.org/attachments/the_linux_kernel_series_3-pdf.1541/
(Enable dynamic printk() support). “printk()” is a commonly d iscussed system call, so remember that it prints debugging message s about the kernel. Here is a Direct M emory Acc ess (DMA) debugging driver (Enable d ebugging of D MAAPI usage).
https://stackoverflow.com/questions/43950631/where-does-dev-dbg-writes-log-to
dynamic_dev_dbg() and dev_printk() call dev_printk_emit() which calls vprintk_emit(). This very same function is called in normal mode when you do just a printk(). Just note here, that the rest functions like dev_err() will end up in the same function. Thus, obviously, the buffer is …
https://android.googlesource.com/kernel/omap/+/b0788caf7af773b6c2374590dabd3a205f0918a8/lib/Kconfig.debug
included in printk output. This allows you to measure: the interval between kernel operations, including bootup: operations. This is useful for identifying long delays: in kernel startup. config ENABLE_WARN_DEPRECATED: bool "Enable __deprecated logic" default y: help: Enable the __deprecated logic in the kernel build.
https://training.ti.com/debugging-embedded-linux-printk-variations?cu=1128405
Apr 15, 2017 · So nowhere in kernel should a call printk directly. This table gave us clear picture of the logging API. For each message level, we have a printk call for it and a corresponding pr call for kernel module to use, and a device call for device driver to use. Among those logging API, there are two of them I want to emphasize-- pr debug and dev debug.
https://www.kernel.org/doc/html/latest/trace/ftrace.html
If CONFIG_DYNAMIC_FTRACE is set, the system will run with virtually no overhead when function tracing is disabled. The way this works is the mcount function call (placed at the start of every kernel function, produced by the -pg switch in gcc), starts of pointing to a simple return.
https://stackoverflow.com/questions/24330671/v4l2-kernel-space-debugging
Is there any default mechanism to enable debugging the v4l2 drivers. Basically I want to check something like dynamic debugging by setting in /d. Compile time flags in make file also fine. Current...
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