Re: [PATCH] clk, ti, LLVMLinux: Move __init outside of type definition

From: Behan Webster
Date: Fri Sep 26 2014 - 20:58:06 EST

On 09/26/14 17:55, Felipe Balbi wrote:
On Fri, Sep 26, 2014 at 05:31:48PM -0700, Behan Webster wrote:
As written, the __init for ti_clk_get_div_table is in the middle of the return

The gcc documentation indicates that section attributes should be added to the
end of the function declaration:

extern void foobar (void) __attribute__ ((section ("bar")));

However gcc seems to be very permissive with where attributes can be placed.
clang on the other hand isn't so permissive, and fails if you put the section
definition in the middle of the return type:

drivers/clk/ti/divider.c:298:28: error: expected ';' after struct
static struct clk_div_table
drivers/clk/ti/divider.c:298:1: warning: 'static' ignored on this
declaration [-Wmissing-declarations]
static struct clk_div_table
drivers/clk/ti/divider.c:299:9: error: type specifier missing,
defaults to 'int' [-Werror,-Wimplicit-int]
__init *ti_clk_get_div_table(struct device_node *node)
~~~~~~ ^
drivers/clk/ti/divider.c:345:9: warning: incompatible pointer types
returning 'struct clk_div_table *' from a function with result type 'int *' [-Wincompatible-pointer-types]
return table;
drivers/clk/ti/divider.c:419:9: warning: incompatible pointer types
assigning to 'const struct clk_div_table *' from 'int *' [-Wincompatible-pointer-types]
*table = ti_clk_get_div_table(node);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
3 warnings and 2 errors generated.

By convention, most of the kernel code puts section attributes between the
return type and function name. In the case where the return type is a pointer,
it's important to place the '*' on left of the __init.

This updated code works for both gcc and clang.

Signed-off-by: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mark Charlebois <charlebm@xxxxxxxxx>
makes sense to me:

Reviewed-by: Felipe Balbi <balbi@xxxxxx>
Thank you.

I wonder if we should add this a Sparse or Coccinelle rule.

I'm hoping it can be added to checkpatch as well.


Behan Webster

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