linux-kernel - Re: [PATCH] PM / clk: Fix broken build due to non-matching code and header #ifdefs

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Date:	Mon, 19 Oct 2015 10:48:53 +0200
From:	Pavel Machek <pavel@....cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Greg Ungerer <gerg@...inux.org>, linux-pm@...r.kernel.org,
	linux-m68kvger.kernel.org@...san.of.borg,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / clk: Fix broken build due to non-matching code and
 header #ifdefs

On Mon 2015-10-19 10:16:07, Geert Uytterhoeven wrote:
> If an architecture's main Kconfig file doesn't include
> kernel/power/Kconfig, but CONFIG_PM=y and HAVE_CLK=y (e.g. m68knommu
> allmodconfig):
> 
>     drivers/base/power/clock_ops.c: In function ‘__pm_clk_add’:
>     drivers/base/power/clock_ops.c:106: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c: At top level:
>     drivers/base/power/clock_ops.c:120: error: redefinition of ‘pm_clk_add’
>     include/linux/pm_clock.h:64: error: previous definition of ‘pm_clk_add’ was here
>     drivers/base/power/clock_ops.c:135: error: redefinition of ‘pm_clk_add_clk’
>     include/linux/pm_clock.h:69: error: previous definition of ‘pm_clk_add_clk’ was here
>     drivers/base/power/clock_ops.c:171: error: redefinition of ‘pm_clk_remove’
>     include/linux/pm_clock.h:73: error: previous definition of ‘pm_clk_remove’ was here
>     drivers/base/power/clock_ops.c: In function ‘pm_clk_remove’:
>     drivers/base/power/clock_ops.c:180: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c:180: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c: At top level:
>     drivers/base/power/clock_ops.c:207: error: redefinition of ‘pm_clk_init’
>     include/linux/pm_clock.h:54: error: previous definition of ‘pm_clk_init’ was here
>     drivers/base/power/clock_ops.c: In function ‘pm_clk_init’:
>     drivers/base/power/clock_ops.c:210: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c: At top level:
>     drivers/base/power/clock_ops.c:221: error: redefinition of ‘pm_clk_create’
>     include/linux/pm_clock.h:57: error: previous definition of ‘pm_clk_create’ was here
>     drivers/base/power/clock_ops.c:234: error: redefinition of ‘pm_clk_destroy’
>     include/linux/pm_clock.h:61: error: previous definition of ‘pm_clk_destroy’ was here
>     drivers/base/power/clock_ops.c: In function ‘pm_clk_destroy’:
>     drivers/base/power/clock_ops.c:246: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c:246: error: ‘struct pm_subsys_data’ has no member named ‘clock_list’
>     drivers/base/power/clock_ops.c: At top level:
>     drivers/base/power/clock_ops.c:263: error: expected identifier or ‘(’ before ‘void’
>     drivers/base/power/clock_ops.c:263: error: expected ‘)’ before numeric constant
>     drivers/base/power/clock_ops.c:293: error: expected identifier or ‘(’ before ‘void’
>     drivers/base/power/clock_ops.c:293: error: expected ‘)’ before numeric constant
>     drivers/base/power/clock_ops.c: In function ‘pm_clk_runtime_suspend’:
>     drivers/base/power/clock_ops.c:384: error: called object ‘0u’ is not a function
>     drivers/base/power/clock_ops.c: In function ‘pm_clk_runtime_resume’:
>     drivers/base/power/clock_ops.c:400: error: called object ‘0u’ is not a function
> 
> This happens because:
>   - drivers/base/power/clock_ops.c depends on CONFIG_HAVE_CLK,
>   - the failing code inside clock_ops.c additionally depends on
>     CONFIG_PM,
>   - the forward declarations and other definitions in <linux/pm_clock.h>
>     depend on CONFIG_PM_CLK,
>   - CONFIG_PM_CLK is defined as PM && HAVE_CLK in kernel/power/Kconfig,
>     but it is not included on all architectures.
> 
> Fix this by protecting the failing code inside clock_ops.c by
> CONFIG_PM_CLK instead of CONFIG_PM, so it matches <linux/pm_clock.h>.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Acked-by: Pavel Machek <pavel@....cz>

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