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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-11-05 13:40:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-06 13:30:38 -0700 |
| commit | d2635f2012a44e3d469ab9a4022162dbe0e53f21 (patch) | |
| tree | 82a5a4ab8294a039d8fad83f9c0c729c8a4bf361 /init | |
| parent | a6ea8b5b9f1ce3403a1c8516035d653006741e80 (diff) | |
| download | linux-d2635f2012a44e3d469ab9a4022162dbe0e53f21.tar.gz linux-d2635f2012a44e3d469ab9a4022162dbe0e53f21.tar.bz2 linux-d2635f2012a44e3d469ab9a4022162dbe0e53f21.zip | |
mm: create a new system state and fix core_kernel_text()
core_kernel_text() considers that until system_state in at least
SYSTEM_RUNNING, init memory is valid.
But init memory is freed a few lines before setting SYSTEM_RUNNING, so
we have a small period of time when core_kernel_text() is wrong.
Create an intermediate system state called SYSTEM_FREEING_INIT that is
set before starting freeing init memory, and use it in
core_kernel_text() to report init memory invalid earlier.
Link: https://lkml.kernel.org/r/9ecfdee7dd4d741d172cb93ff1d87f1c58127c9a.1633001016.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c index 3c4054a95545..767ee2672176 100644 --- a/init/main.c +++ b/init/main.c @@ -1506,6 +1506,8 @@ static int __ref kernel_init(void *unused) kernel_init_freeable(); /* need to finish all async __init code before freeing the memory */ async_synchronize_full(); + + system_state = SYSTEM_FREEING_INITMEM; kprobe_free_init_mem(); ftrace_free_init_mem(); kgdb_free_init_mem(); |