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Message-ID: <20080910181950.GC8067@lenovo>
Date: Wed, 10 Sep 2008 22:19:50 +0400
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Yinghai Lu <yhlu.kernel@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
"Maciej W. Rozycki" <macro@...ux-mips.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: io-apic - get rid of __DO_ACTION macro
[Yinghai Lu - Wed, Sep 10, 2008 at 10:30:39AM -0700]
| On Wed, Sep 10, 2008 at 2:31 AM, Ingo Molnar <mingo@...e.hu> wrote:
| >
| > * Yinghai Lu <yhlu.kernel@...il.com> wrote:
| >
| >> On Tue, Sep 9, 2008 at 11:02 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
| >> > On Wed, Sep 10, 2008 at 12:13 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
| >> > ...
| >> >>
| >> >> hope we can keep using MACRO..
| >> >>
| >> >> YH
| >> >>
| >> >
| >> > Btw, Yinghai, what does it mean? To not touch this macro at all?
| >> > Or you mean about implementation issue (ie the design itself)?
| >>
| >> do not touch this macro... and may revisit after 2.6.28
| >
| > anything you are particularly worried about? Regressions we should be
| > able to find pretty quickly, in a central macro like that - and the
| > macro is quite ugly.
| >
|
| ok, let remove unneeded "if", and use function pointer...
|
| void (*extra_action_t)(struct irq_pin_list *entry);
|
| +static inline void io_apic_modify_irq(unsigned int irq,
| + int mask_and, int mask_or,
| + int mask_and_not, extra_action_t action)
| +{
| + int pin;
| + struct irq_cfg *cfg;
| + struct irq_pin_list *entry;
| + cfg = irq_cfg(irq);
| + for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
| + unsigned int reg;
| + pin = entry->pin;
| + reg = io_apic_read(entry->apic, 0x10 + pin * 2);
| + reg &= mask_and;
| + reg |= mask_or;
| + reg &= ~mask_and_not;
| + io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
| + if (action)
| + action(entry);
| + }
| +}
|
| +void extra_read(struct irq_pin_list *entry)
| + {
| + /*
| + * Synchronize the IO-APIC and the CPU by doing
| + * a dummy read from the IO-APIC
| + */
| + struct io_apic __iomem *io_apic;
| + io_apic = io_apic_base(entry->apic);
| + readl(&io_apic->data);
| + }
|
|
| YH
|
Yinghai, Ingo, what about this one?
- Cyrill -
---
From: Cyrill Gorcunov <gorcunov@...il.com>
Subject: x86: io-apic - get rid of __DO_ACTION macro v3
Replace __DO_ACTION macro with io_apic_modify_irq function.
This allow us to 'grep' definitions being hided by
__DO_ACTION macro:
__unmask_IO_APIC_irq
__mask_IO_APIC_irq
__mask_and_edge_IO_APIC_irq
__unmask_and_level_IO_APIC_irq
Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
CC: Yinghai Lu <yhlu.kernel@...il.com>
---
Index: linux-2.6.git/arch/x86/kernel/io_apic.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/io_apic.c 2008-09-09 22:27:57.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/io_apic.c 2008-09-10 22:17:25.000000000 +0400
@@ -643,65 +643,66 @@ static void __init replace_pin_at_irq(un
add_pin_to_irq(irq, newapic, newpin);
}
-#define __DO_ACTION(R, ACTION_ENABLE, ACTION_DISABLE, FINAL) \
- \
-{ \
- int pin; \
- struct irq_cfg *cfg; \
- struct irq_pin_list *entry; \
- \
- cfg = irq_cfg(irq); \
- entry = cfg->irq_2_pin; \
- for (;;) { \
- unsigned int reg; \
- if (!entry) \
- break; \
- pin = entry->pin; \
- reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
- reg ACTION_DISABLE; \
- reg ACTION_ENABLE; \
- io_apic_modify(entry->apic, 0x10 + R + pin*2, reg); \
- FINAL; \
- if (!entry->next) \
- break; \
- entry = entry->next; \
- } \
-}
-
-#define DO_ACTION(name,R, ACTION_ENABLE, ACTION_DISABLE, FINAL) \
- \
- static void name##_IO_APIC_irq (unsigned int irq) \
- __DO_ACTION(R, ACTION_ENABLE, ACTION_DISABLE, FINAL)
+static inline void io_apic_modify_irq(unsigned int irq,
+ int mask_and, int mask_or,
+ void (*final)(struct irq_pin_list *entry))
+{
+ int pin;
+ struct irq_cfg *cfg;
+ struct irq_pin_list *entry;
-/* mask = 0 */
-DO_ACTION(__unmask, 0, |= 0, &= ~IO_APIC_REDIR_MASKED, )
+ cfg = irq_cfg(irq);
+ for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
+ unsigned int reg;
+ pin = entry->pin;
+ reg = io_apic_read(entry->apic, 0x10 + pin * 2);
+ reg &= mask_and;
+ reg |= mask_or;
+ io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
+ if (final)
+ final(entry);
+ }
+}
+
+static void __unmask_IO_APIC_irq(unsigned int irq)
+{
+ io_apic_modify_irq(irq, ~IO_APIC_REDIR_MASKED, 0, NULL);
+}
#ifdef CONFIG_X86_64
-/*
- * Synchronize the IO-APIC and the CPU by doing
- * a dummy read from the IO-APIC
- */
-static inline void io_apic_sync(unsigned int apic)
+void io_apic_sync(struct irq_pin_list *entry)
{
- struct io_apic __iomem *io_apic = io_apic_base(apic);
+ /*
+ * Synchronize the IO-APIC and the CPU by doing
+ * a dummy read from the IO-APIC
+ */
+ struct io_apic __iomem *io_apic;
+ io_apic = io_apic_base(entry->apic);
readl(&io_apic->data);
}
-/* mask = 1 */
-DO_ACTION(__mask, 0, |= IO_APIC_REDIR_MASKED, &= ~0, io_apic_sync(entry->apic))
-
-#else
-
-/* mask = 1 */
-DO_ACTION(__mask, 0, |= IO_APIC_REDIR_MASKED, &= ~0, )
-
-/* mask = 1, trigger = 0 */
-DO_ACTION(__mask_and_edge, 0, |= IO_APIC_REDIR_MASKED, &= ~IO_APIC_REDIR_LEVEL_TRIGGER, )
+static void __mask_IO_APIC_irq(unsigned int irq)
+{
+ io_apic_modify_irq(irq, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
+}
+#else /* CONFIG_X86_32 */
+static void __mask_IO_APIC_irq(unsigned int irq)
+{
+ io_apic_modify_irq(irq, ~0, IO_APIC_REDIR_MASKED, NULL);
+}
-/* mask = 0, trigger = 1 */
-DO_ACTION(__unmask_and_level, 0, |= IO_APIC_REDIR_LEVEL_TRIGGER, &= ~IO_APIC_REDIR_MASKED, )
+static void __mask_and_edge_IO_APIC_irq(unsigned int irq)
+{
+ io_apic_modify_irq(irq, ~IO_APIC_REDIR_LEVEL_TRIGGER,
+ IO_APIC_REDIR_MASKED, NULL);
+}
-#endif
+static void __unmask_and_level_IO_APIC_irq(unsigned int irq)
+{
+ io_apic_modify_irq(irq, ~IO_APIC_REDIR_MASKED,
+ IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
+}
+#endif /* CONFIG_X86_32 */
static void mask_IO_APIC_irq (unsigned int irq)
{
--
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