[PATCH 1/3] CLK: uninline clk_prepare() and clk_unprepare()

On Thu, Nov 22, 2012 at 09:30:33AM +0000, Russell King - ARM Linux wrote:

On Wed, Nov 21, 2012 at 06:17:50PM -0800, Dmitry Torokhov wrote:

quoted

quoted

You've checked non-ARM architectures too?

Yes:

[dtor at dtor-d630 linux-next]$ grep -r HAVE_CLK_PREPARE .
./arch/arm/Kconfig:     select HAVE_CLK_PREPARE
Binary file ./.git/objects/pack/pack-7dad5ee164f601f1327dc78648fa317772c2d872.pack matches
./include/linux/clk.h:#ifdef CONFIG_HAVE_CLK_PREPARE
./include/linux/clk.h:#ifdef CONFIG_HAVE_CLK_PREPARE
./drivers/clk/Kconfig:config HAVE_CLK_PREPARE
./drivers/clk/Kconfig:  select HAVE_CLK_PREPARE

Err, no you haven't, not with that grep.  What you've found are the places
which enable this, and say "yes, I have clk_prepare".

What HAVE_CLK_PREPARE is about though is providing a transition path between
drivers using clk_prepare() to platforms which _don't_ have a clk_prepare()
implementation - and when it's unset, it provides a default implementation.

So, finding all those places where the symbol exists is the exact opposite
of what you need to be doing.  You need to find those platforms which have
CLK support, but which don't have HAVE_CLK_PREPARE selected.

Right, according to my greps under arch/arm, the following define a
clk_enable() function but do not define a clk_prepare() function:

arch/arm/mach-w90x900/clock.c
arch/arm/mach-ep93xx/clock.c
arch/arm/plat-omap/clock.c
arch/arm/plat-samsung/clock.c
arch/arm/mach-lpc32xx/clock.c
arch/arm/mach-msm/clock.c
arch/arm/mach-mmp/clock.c
arch/arm/mach-sa1100/clock.c
arch/arm/mach-at91/clock.c
arch/arm/mach-at91/at91x40.c
arch/arm/mach-pxa/clock.c
arch/arm/plat-versatile/clock.c
arch/arm/mach-davinci/clock.c

This list gets over twice as big if you widen the search to the arch/
subtree.

If any of these makes use of a driver which makes a call to clk_prepare(),
removing HAVE_CLK_PREPARE will break all those platforms.