Kernel/sysctl.c contains more than 190 interface files, and there are a large number of config macro controls. When modifying the sysctl interface directly in kernel/sysctl.c, conflicts are very easy to occur. E.g: https://lore.kernel.org/lkml/99095805-8cbe-d140-e2f1-0c5a3e84d7e7@xxxxxxxxxx/ Use register_sysctl() to register the sysctl interface to avoid merge conflicts when different features modify sysctl.c at the same time. So consider cleaning up the sysctls table, details are in: https://kernelnewbies.org/KernelProjects/proc https://lore.kernel.org/lkml/20200513141421.GP11244@xxxxxxxxxxxxxxxxxxx/#t The current patch set extracts register_sysctl_init and some sysctl_vals variables, and clears the interface of hung_task and watchdog in sysctl.c. The current patch set is based on linux-next, commit 72bc15d0018ebfbc9 ("Add linux-next specific files for 20200518"). changes in v4: Handle the conflict with the commit d4ee116819ed714f ("kernel/hung_task.c: introduce sysctl to print all traces when a hung task is detected"), move the sysctl interface hung_task_all_cpu_backtrace to hung_task.c. V3: https://lore.kernel.org/lkml/1589774397-42485-1-git-send-email-nixiaoming@xxxxxxxxxx/ base on commit b9bbe6ed63b2b9 ("Linux 5.7-rc6") changes in v3: 1. make hung_task_timeout_max to be const 2. fix build warning: kernel/watchdog.c:779:14: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] .extra2 = &sixty, ^ V2: https://lore.kernel.org/lkml/1589619315-65827-1-git-send-email-nixiaoming@xxxxxxxxxx/ changes in v2: 1. Adjusted the order of patches, first do public function extraction, then do feature code movement 2. Move hung_task sysctl to hung_task.c instead of adding new file 3. Extract multiple common variables instead of only neg_one, and keep the order of member values in sysctl_vals 4. Add const modification to the variable sixty in watchdog sysctl V1: https://lore.kernel.org/lkml/1589517224-123928-1-git-send-email-nixiaoming@xxxxxxxxxx/ Xiaoming Ni (4): sysctl: Add register_sysctl_init() interface sysctl: Move some boundary constants form sysctl.c to sysctl_vals hung_task: Move hung_task sysctl interface to hung_task.c watchdog: move watchdog sysctl interface to watchdog.c fs/proc/proc_sysctl.c | 2 +- include/linux/sched/sysctl.h | 14 +-- include/linux/sysctl.h | 13 ++- kernel/hung_task.c | 77 +++++++++++++++- kernel/sysctl.c | 214 +++++++------------------------------------ kernel/watchdog.c | 101 ++++++++++++++++++++ 6 files changed, 224 insertions(+), 197 deletions(-) -- 1.8.5.6
