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[PATCH 1/5] clk: qoriq: add __init attribute

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  [PATCH 1/5] clk: qoriq: add __init attribute Julia Lawall <Julia.Lawall@lip6.fr> - 2016-04-18 17:20 +0200
    Re: [PATCH 1/5] clk: qoriq: add __init attribute Stephen Boyd <sboyd@codeaurora.org> - 2016-04-18 21:00 +0200

#1381822 — [PATCH 1/5] clk: qoriq: add __init attribute

Add __init attribute on a function that is only called from other __init
functions and that is not inlined, at least with gcc version 4.8.4 on an
x86 machine with allyesconfig.  Currently, the function is put in the
.text.unlikely segment.  Declaring it as __init will cause it to be put in
the .init.text and to disappear after initialization.

The result of objdump -x on the function before the change is as follows:

0000000000000000 l     F .text.unlikely 0000000000000071 sysclk_from_fixed.constprop.5

And after the change it is as follows:

0000000000000480 l     F .init.text	000000000000006c sysclk_from_fixed.constprop.5

Done with the help of Coccinelle.  The semantic patch checks for local
static non-init functions that are called from an __init function and are
not called from any other function.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/clk/clk-qoriq.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-qoriq.c b/drivers/clk/clk-qoriq.c
index 7bc1c45..5c11b58 100644
--- a/drivers/clk/clk-qoriq.c
+++ b/drivers/clk/clk-qoriq.c
@@ -869,7 +869,8 @@ static void __init core_mux_init(struct device_node *np)
 	}
 }
 
-static struct clk *sysclk_from_fixed(struct device_node *node, const char *name)
+static struct clk __init
+*sysclk_from_fixed(struct device_node *node, const char *name)
 {
 	u32 rate;
 

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#1381979

On 04/18, Julia Lawall wrote:
> Add __init attribute on a function that is only called from other __init
> functions and that is not inlined, at least with gcc version 4.8.4 on an
> x86 machine with allyesconfig.  Currently, the function is put in the
> .text.unlikely segment.  Declaring it as __init will cause it to be put in
> the .init.text and to disappear after initialization.
> 
> The result of objdump -x on the function before the change is as follows:
> 
> 0000000000000000 l     F .text.unlikely 0000000000000071 sysclk_from_fixed.constprop.5
> 
> And after the change it is as follows:
> 
> 0000000000000480 l     F .init.text	000000000000006c sysclk_from_fixed.constprop.5
> 
> Done with the help of Coccinelle.  The semantic patch checks for local
> static non-init functions that are called from an __init function and are
> not called from any other function.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> ---

Applied to clk-next

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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