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| author |   Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2021-03-12 11:30:27 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-23 14:57:35 +0100 |
| commit | 01085e24ff0ae775e7407a6e40c2156a724ae884 (patch) | |
| tree | d00c705efc4360b2e54b23aa2c263f901247819f /drivers/base/devtmpfs.c | |
| parent | devtmpfs: fix placement of complete() call (diff) | |
| download | linux-dev-01085e24ff0ae775e7407a6e40c2156a724ae884.tar.xz linux-dev-01085e24ff0ae775e7407a6e40c2156a724ae884.zip | |
devtmpfs: actually reclaim some init memory
Currently gcc seems to inline devtmpfs_setup() into devtmpfsd(), so
its memory footprint isn't reclaimed as intended. Mark it noinline to
make sure it gets put in .init.text.
While here, setup_done can also be put in .init.data: After complete()
releases the internal spinlock, the completion object is never touched
again by that thread, and the waiting thread doesn't proceed until it
observes ->done while holding that spinlock.
This is now the same pattern as for kthreadd_done in init/main.c:
complete() is done in a __ref function, while the corresponding
wait_for_completion() is in an __init function.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20210312103027.2701413-2-linux@rasmusvillemoes.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/devtmpfs.c')
| -rw-r--r-- | drivers/base/devtmpfs.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index aedeb2dc1a18..8be352ab4ddb 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -371,7 +371,7 @@ int __init devtmpfs_mount(void) return err; } -static DECLARE_COMPLETION(setup_done); +static __initdata DECLARE_COMPLETION(setup_done); static int handle(const char *name, umode_t mode, kuid_t uid, kgid_t gid, struct device *dev) @@ -405,7 +405,7 @@ static void __noreturn devtmpfs_work_loop(void) } } -static int __init devtmpfs_setup(void *p) +static noinline int __init devtmpfs_setup(void *p) { int err; |