IIRC, when I tried to send a patch to remove it, Andi told me we still need to keep compabitlies for old libc, so we can't remove this completely. Then just make it default to n and remove the doc from feature-removal-schedule.txt. Signed-off-by: WANG Cong <amwang@xxxxxxxxxx> Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> --- diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index c4a6e14..ad5d67b 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -133,41 +133,6 @@ Who: Pavel Machek <pavel@xxxxxx> --------------------------- -What: sys_sysctl -When: September 2010 -Option: CONFIG_SYSCTL_SYSCALL -Why: The same information is available in a more convenient from - /proc/sys, and none of the sysctl variables appear to be - important performance wise. - - Binary sysctls are a long standing source of subtle kernel - bugs and security issues. - - When I looked several months ago all I could find after - searching several distributions were 5 user space programs and - glibc (which falls back to /proc/sys) using this syscall. - - The man page for sysctl(2) documents it as unusable for user - space programs. - - sysctl(2) is not generally ABI compatible to a 32bit user - space application on a 64bit and a 32bit kernel. - - For the last several months the policy has been no new binary - sysctls and no one has put forward an argument to use them. - - Binary sysctls issues seem to keep happening appearing so - properly deprecating them (with a warning to user space) and a - 2 year grace warning period will mean eventually we can kill - them and end the pain. - - In the mean time individual binary sysctls can be dealt with - in a piecewise fashion. - -Who: Eric Biederman <ebiederm@xxxxxxxxxxxx> - ---------------------------- - What: /proc/<pid>/oom_adj When: August 2012 Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's diff --git a/init/Kconfig b/init/Kconfig index d627783..566b2a4 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -935,7 +935,7 @@ config UID16 config SYSCTL_SYSCALL bool "Sysctl syscall support" if EXPERT depends on PROC_SYSCTL - default y + default n select SYSCTL ---help--- sys_sysctl uses binary paths that have been found challenging @@ -947,7 +947,7 @@ config SYSCTL_SYSCALL trying to save some space it is probably safe to disable this, making your kernel marginally smaller. - If unsure say Y here. + If unsure say N here. config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
