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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2021-03-12 13:30:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-23 16:57:35 +0300
commit01085e24ff0ae775e7407a6e40c2156a724ae884 (patch)
treed00c705efc4360b2e54b23aa2c263f901247819f /drivers/base/devtmpfs.c
parent38f087de8947700d3b06d3d1594490e0f611c5d1 (diff)
downloadlinux-01085e24ff0ae775e7407a6e40c2156a724ae884.tar.xz
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.c4
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;