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Message-ID: <4C7DF3B7.7010305@snapgear.com>
Date: Wed, 1 Sep 2010 16:33:27 +1000
From: Greg Ungerer <gerg@...pgear.com>
To: David Howells <dhowells@...hat.com>
CC: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/22] Fix M68K irqflags
On 31/08/10 06:50, David Howells wrote:
> Greg Ungerer<gerg@...pgear.com> wrote:
>
>> I have no problem with the changes as such. But I would rather
>> not have separate mm and no headers if we can avoid it.
>
> Well, I can roll the headers into one, but then it'll be much more #ifdef'd if
> you're okay with that. The IRQ handling seems sufficiently different to
> warrant that.
Here is a spin of the same patch, only with a single irqflags.h.
It is closely modeled on the mm version, merging (and cleaning)
the non-mmu bits as needed. There is a fair bit of common code
in here.
It does refactor arch_local_irq_save() but I am pretty sure that
makes no impact (performance or code size). I have left
arch_irq_enable as-is for all, it is not clear to me why it is
the way it is for the mm case (Geert?)
This is not run or compile tested...
Regards
Greg
arch/m68k/include/asm/irqflags.h | 88
+++++++++++++++++++++++++++++++++++++
arch/m68k/include/asm/system_mm.h | 25 +----------
arch/m68k/include/asm/system_no.h | 49 +--------------------
3 files changed, 90 insertions(+), 72 deletions(-)
create mode 100644 arch/m68k/include/asm/irqflags.h
diff --git a/arch/m68k/include/asm/irqflags.h
b/arch/m68k/include/asm/irqflags.h
new file mode 100644
index 0000000..b61edcc
--- /dev/null
+++ b/arch/m68k/include/asm/irqflags.h
@@ -0,0 +1,88 @@
+#ifndef _M68K_IRQFLAGS_MM_H
+#define _M68K_IRQFLAGS_MM_H
+
+#include <linux/types.h>
+#include <linux/hardirq.h>
+#include <asm/thread_info.h>
+#include <asm/entry.h>
+
+static inline unsigned long arch_local_save_flags(void)
+{
+ unsigned long flags;
+ asm volatile ("movew %%sr,%0": "=d" (flags) : : "memory");
+ return flags;
+}
+
+static inline void arch_local_irq_disable(void)
+{
+#ifdef CONFIG_COLDFIRE
+ asm volatile (
+ "move %/sr,%%d0 \n\t"
+ "ori.l #0x0700,%%d0 \n\t"
+ "move %%d0,%/sr \n"
+ : /* no outputs */
+ :
+ : "cc", "%d0", "memory");
+#else
+ asm volatile ("oriw #0x0700,%%sr" : : : "memory");
+#endif
+}
+
+#ifdef CONFIG_MMU
+#if 0
+static inline void arch_local_irq_enable(void)
+{
+ asm volatile ("andiw %0,%%sr" : : "i" (ALLOWINT) : "memory");
+}
+#else
+#define arch_local_irq_enable() \
+ do { \
+ if (MACH_IS_Q40 || !hardirq_count()) \
+ asm volatile ("andiw %0,%%sr" \
+ : : "i" (ALLOWINT) : "memory"); \
+ } while (0)
+#endif
+#else
+static inline void arch_local_irq_enable(void)
+{
+#ifdef CONFIG_COLDFIRE
+ asm volatile (
+ "move %/sr,%%d0 \n\t"
+ "andi.l #0xf8ff,%%d0 \n\t"
+ "move %%d0,%/sr \n"
+ : /* no outputs */
+ :
+ : "cc", "%d0", "memory");
+#else
+ asm volatile (
+ "andiw %0,%%sr"
+ :
+ : "i" (ALLOWINT)
+ : "memory")
+#endif
+}
+#endif
+
+static inline unsigned long arch_local_irq_save(void)
+{
+ unsigned long flags = arch_local_save_flags();
+ arch_local_irq_disable();
+ return flags;
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+ asm volatile ("movew %0,%%sr": : "d" (flags) : "memory");
+}
+
+static inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+ return (flags & ~ALLOWINT) != 0;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+ return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+#endif /* _M68K_IRQFLAGS_MM_H */
diff --git a/arch/m68k/include/asm/system_mm.h
b/arch/m68k/include/asm/system_mm.h
index 485daec..47b01f4 100644
--- a/arch/m68k/include/asm/system_mm.h
+++ b/arch/m68k/include/asm/system_mm.h
@@ -3,6 +3,7 @@
#include <linux/linkage.h>
#include <linux/kernel.h>
+#include <linux/irqflags.h>
#include <asm/segment.h>
#include <asm/entry.h>
@@ -62,30 +63,6 @@ asmlinkage void resume(void);
#define smp_wmb() barrier()
#define smp_read_barrier_depends() ((void)0)
-/* interrupt control.. */
-#if 0
-#define local_irq_enable() asm volatile ("andiw %0,%%sr": : "i"
(ALLOWINT) : "memory")
-#else
-#include <linux/hardirq.h>
-#define local_irq_enable() ({ \
- if (MACH_IS_Q40 || !hardirq_count()) \
- asm volatile ("andiw %0,%%sr": : "i" (ALLOWINT) : "memory"); \
-})
-#endif
-#define local_irq_disable() asm volatile ("oriw #0x0700,%%sr": : :
"memory")
-#define local_save_flags(x) asm volatile ("movew %%sr,%0":"=d" (x) : :
"memory")
-#define local_irq_restore(x) asm volatile ("movew %0,%%sr": :"d" (x) :
"memory")
-
-static inline int irqs_disabled(void)
-{
- unsigned long flags;
- local_save_flags(flags);
- return flags & ~ALLOWINT;
-}
-
-/* For spinlocks etc */
-#define local_irq_save(x) ({ local_save_flags(x); local_irq_disable(); })
-
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned
long)(x),(ptr),sizeof(*(ptr))))
struct __xchg_dummy { unsigned long a[100]; };
diff --git a/arch/m68k/include/asm/system_no.h
b/arch/m68k/include/asm/system_no.h
index 08f31bd..2bf670d 100644
--- a/arch/m68k/include/asm/system_no.h
+++ b/arch/m68k/include/asm/system_no.h
@@ -2,6 +2,7 @@
#define _M68KNOMMU_SYSTEM_H
#include <linux/linkage.h>
+#include <linux/irqflags.h>
#include <asm/segment.h>
#include <asm/entry.h>
@@ -46,54 +47,6 @@ asmlinkage void resume(void);
(last) = _last; \
}
-#ifdef CONFIG_COLDFIRE
-#define local_irq_enable() __asm__ __volatile__ ( \
- "move %/sr,%%d0\n\t" \
- "andi.l #0xf8ff,%%d0\n\t" \
- "move %%d0,%/sr\n" \
- : /* no outputs */ \
- : \
- : "cc", "%d0", "memory")
-#define local_irq_disable() __asm__ __volatile__ ( \
- "move %/sr,%%d0\n\t" \
- "ori.l #0x0700,%%d0\n\t" \
- "move %%d0,%/sr\n" \
- : /* no outputs */ \
- : \
- : "cc", "%d0", "memory")
-/* For spinlocks etc */
-#define local_irq_save(x) __asm__ __volatile__ ( \
- "movew %%sr,%0\n\t" \
- "movew #0x0700,%%d0\n\t" \
- "or.l %0,%%d0\n\t" \
- "movew %%d0,%/sr" \
- : "=d" (x) \
- : \
- : "cc", "%d0", "memory")
-#else
-
-/* portable version */ /* FIXME - see entry.h*/
-#define ALLOWINT 0xf8ff
-
-#define local_irq_enable() asm volatile ("andiw %0,%%sr": : "i"
(ALLOWINT) : "memory")
-#define local_irq_disable() asm volatile ("oriw #0x0700,%%sr": : :
"memory")
-#endif
-
-#define local_save_flags(x) asm volatile ("movew %%sr,%0":"=d" (x) : :
"memory")
-#define local_irq_restore(x) asm volatile ("movew %0,%%sr": :"d" (x) :
"memory")
-
-/* For spinlocks etc */
-#ifndef local_irq_save
-#define local_irq_save(x) do { local_save_flags(x);
local_irq_disable(); } while (0)
-#endif
-
-#define irqs_disabled() \
-({ \
- unsigned long flags; \
- local_save_flags(flags); \
- ((flags & 0x0700) == 0x0700); \
-})
-
#define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc")
/*
--
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