mirror-linux/kernel/time
Masahiro Yamada 2390095113 tick/nohz: unexport __init-annotated tick_nohz_full_setup()
EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.

modpost used to detect it, but it had been broken for a decade.

Commit 28438794ab ("modpost: fix section mismatch check for exported
init/exit sections") fixed it so modpost started to warn it again, then
this showed up:

    MODPOST vmlinux.symvers
  WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup()
  The symbol tick_nohz_full_setup is exported and annotated __init
  Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export.

Drop the export because tick_nohz_full_setup() is only called from the
built-in code in kernel/sched/isolation.c.

Fixes: ae9e557b5b ("time: Export tick start/stop functions for rcutorture")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-06-27 10:43:12 -07:00
..
Kconfig
Makefile
alarmtimer.c
clockevents.c
clocksource-wdtest.c
clocksource.c
hrtimer.c
itimer.c
jiffies.c
namespace.c
ntp.c
ntp_internal.h
posix-clock.c
posix-cpu-timers.c
posix-stubs.c
posix-timers.c
posix-timers.h
sched_clock.c
test_udelay.c
tick-broadcast-hrtimer.c
tick-broadcast.c
tick-common.c
tick-internal.h
tick-legacy.c
tick-oneshot.c
tick-sched.c tick/nohz: unexport __init-annotated tick_nohz_full_setup() 2022-06-27 10:43:12 -07:00
tick-sched.h
time.c
time_test.c
timeconst.bc
timeconv.c
timecounter.c
timekeeping.c Random number generator updates for Linux 5.19-rc1. 2022-05-24 11:58:10 -07:00
timekeeping.h
timekeeping_debug.c
timekeeping_internal.h
timer.c Random number generator updates for Linux 5.19-rc1. 2022-05-24 11:58:10 -07:00
timer_list.c
vsyscall.c