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Date: Tue, 26 Mar 2013 09:24:24 +0000
From: Arnd Bergmann <arnd@...db.de>
To: Axel Lin <axel.lin@...ics.com>
Cc: Rob Herring <rob.herring@...xeda.com>,
John Stultz <john.stultz@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org,
Thomas Abraham <thomas.abraham@...aro.org>
Subject: Re: [PATCH] clocksource: Fix build error when !CONFIG_CLKSRC_OF
On Tuesday 26 March 2013, Axel Lin wrote:
> Fix below build error:
>
> CC drivers/clocksource/exynos_mct.o
> drivers/clocksource/exynos_mct.c:557:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__unused'
> drivers/clocksource/exynos_mct.c:558:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__unused'
> make[2]: *** [drivers/clocksource/exynos_mct.o] Error 1
> make[1]: *** [drivers/clocksource] Error 2
> make: *** [drivers] Error 2
>
> This build error is introduced by commit 4d10f054
> "clocksource: make CLOCKSOURCE_OF_DECLARE type safe".
Hi Axel,
Thanks for the bug report. It seems that the __unused does not exist in
the kernel, so I'll have to use __attribute__((unused)) instead.
I definitely want to keep the feature of checking the function prototype
even for CONFIG_OF=n though, so I won't remove the macro definition.
I'll apply this patch unless there are further concerns with it.
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index ac33184..818be77 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -346,7 +346,7 @@ extern void clocksource_of_init(void);
static inline void clocksource_of_init(void) {}
#define CLOCKSOURCE_OF_DECLARE(name, compat, fn) \
static const struct of_device_id __clksrc_of_table_##name \
- __unused __section(__clksrc_of_table) \
+ __attribute__((__unused__)) \
= { .compatible = compat, \
.data = (fn == (clocksource_of_init_fn)NULL) ? fn : fn }
#endif
Since Rob's earlier patches changed the interface for CLOCKSOURCE_OF_DECLARE,
we will also need to have a patch like the one below for the exynos_mct
driver.
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 203ac05..fc95114 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -511,48 +511,37 @@ static void __init exynos4_timer_resources(struct device_node *np)
#endif /* CONFIG_LOCAL_TIMERS */
}
-static const struct of_device_id exynos_mct_ids[] = {
- { .compatible = "samsung,exynos4210-mct", .data = (void *)MCT_INT_SPI },
- { .compatible = "samsung,exynos4412-mct", .data = (void *)MCT_INT_PPI },
-};
-
-void __init mct_init(void)
+static void __init mct_init(struct device_node *np)
{
- struct device_node *np = NULL;
- const struct of_device_id *match;
u32 nr_irqs, i;
-#ifdef CONFIG_OF
- np = of_find_matching_node_and_match(NULL, exynos_mct_ids, &match);
-#endif
- if (np) {
- mct_int_type = (u32)(match->data);
-
- /* This driver uses only one global timer interrupt */
- mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
-
- /*
- * Find out the number of local irqs specified. The local
- * timer irqs are specified after the four global timer
- * irqs are specified.
- */
-#ifdef CONFIG_OF
- nr_irqs = of_irq_count(np);
-#endif
- for (i = MCT_L0_IRQ; i < nr_irqs; i++)
- mct_irqs[i] = irq_of_parse_and_map(np, i);
- } else if (soc_is_exynos4210()) {
- mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
- mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0;
- mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1;
- mct_int_type = MCT_INT_SPI;
- } else {
- panic("unable to determine mct controller type\n");
- }
+ /* This driver uses only one global timer interrupt */
+ mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
+
+ /*
+ * Find out the number of local irqs specified. The local
+ * timer irqs are specified after the four global timer
+ * irqs are specified.
+ */
+ nr_irqs = of_irq_count(np);
+ for (i = MCT_L0_IRQ; i < nr_irqs; i++)
+ mct_irqs[i] = irq_of_parse_and_map(np, i);
exynos4_timer_resources(np);
exynos4_clocksource_init();
exynos4_clockevent_init();
}
-CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init)
-CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init)
+
+static void __init exynos4210_mct_init(struct device_node *np)
+{
+ mct_int_type = MCT_INT_SPI;
+ mct_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", exynos4210_mct_init);
+
+static void __init exynos4412_mct_init(struct device_node *np)
+{
+ mct_int_type = MCT_INT_PPI;
+ mct_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", exynos4412_mct_init);
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index 535cecf..5cac5ce 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -88,6 +88,12 @@ static inline void *of_irq_find_parent(struct device_node *child)
{
return NULL;
}
+
+static inline int of_irq_count(struct device_node *dev)
+{
+ return 0;
+}
+
#endif /* !CONFIG_OF */
#endif /* __OF_IRQ_H */
--
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