This adds to lib/Kconfig.debug the options for printk messages to display either error number only (the current behavior), number and error name or number, name and description. These options in turn select STRERROR_NAME and STRERROR as needed, so I'm not adding any direct options to enable those, although it can be added later if somebody needs strerror() or strerror_name() when not enabled in printks. kconfg Signed-off-by: Daniel Santos <daniel.santos@xxxxxxxxx> --- lib/Kconfig.debug | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c9eef36..919f371 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -58,6 +58,7 @@ config DYNAMIC_DEBUG implicitly compiles in all pr_debug() and dev_dbg() calls, which enlarges the kernel text size by about 2%. + If a source file is compiled with DEBUG flag set, any pr_debug() calls in it are enabled by default, but can be disabled at runtime as below. Note that DEBUG flag is @@ -113,6 +114,58 @@ config DYNAMIC_DEBUG See Documentation/dynamic-debug-howto.txt for additional information. +choice + prompt "Display errors in printk as" + default PRINTK_ERROR_CODES_ONLY + depends on PRINTK + help + This option tells printk how to display error codes when + formatted with the %de format code (a Linux printk extension). + Error codes are most commonly passed to userspace when syscalls + return where they are then translated into localized descrptions + via libc's strerror(), perror(), etc. However, many error + conditions (for drivers and such) are only reported via printks + where there is no such userspace mechanism to reliably translate + error numbers into something a little more human. + + This option allows you to perform that translation in the kernel, + at the cost of a slightly larger kernel. Note that no native + language support is currently, or may ever be provided. + + If unsure, choose "Error codes only". + +config PRINTK_ERROR_CODES_ONLY + bool "Error codes only" + help + Just display the error number. + +config PRINTK_ERROR_NAMES + bool "Error names" + select STRERROR_NAME + help + This option causes printk messages containing an error code to + print the name of the error in addition to the error number. + Enabling this adds about 2k. Example: -22 (EINVAL) + +config PRINTK_ERROR_DESCS + bool "Full descrptions" + select STRERROR + select STRERROR_NAME + help + This option causes printk messages containing an error code to + print the description of errors (in addition to the name and + number) and can be helpful for those with aversions to search + engines. Enabling this adds about 6k over error codes alone. + Example: -90 (EMSGSIZE: Message too long) + +endchoice + +config STRERROR + bool + +config STRERROR_NAME + bool + endmenu # "printk and dmesg options" menu "Compile-time checks and compiler options" -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
