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Ensure that kernel_init_freeable() is not inlined into non __init code 

Commit d6b2123802 "make sure that we always have a return path from
kernel_execve()" reshuffled kernel_init()/init_post() to ensure that
kernel_execve() has a caller to return to.

It removed __init annotation for kernel_init() and introduced/calls a
new routine kernel_init_freeable(). Latter however is inlined by any
reasonable compiler (ARC gcc 4.4 in this case), causing slight code
bloat.

This patch forces kernel_init_freeable() as noinline reducing the .text

bloat-o-meter vmlinux vmlinux_new
add/remove: 1/0 grow/shrink: 0/1 up/down: 374/-334 (40)
function                        old     new   delta
kernel_init_freeable              -     374    +374 (.init.text)
kernel_init                     628     294    -334 (.text)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Vineet Gupta 2012-12-21 12:25:44 +05:30 committed by Al Viro
parent a49f0d1ea3
commit f80b0c904d
1 changed files with 2 additions and 2 deletions
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4
init/main.c
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@ -802,7 +802,7 @@ static int run_init_process(const char *init_filename)
(const char __user *const __user *)envp_init);
}
static void __init kernel_init_freeable(void);
static noinline void __init kernel_init_freeable(void);
static int __ref kernel_init(void *unused)
{
@ -845,7 +845,7 @@ static int __ref kernel_init(void *unused)
"See Linux Documentation/init.txt for guidance.");
}
static void __init kernel_init_freeable(void)
static noinline void __init kernel_init_freeable(void)
{
/*
* Wait until kthreadd is all set-up.