linux-kernel - Re: [PATCH 1/4] Blackfin: arch patch for 2.6.18

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Date:	Wed, 27 Sep 2006 12:25:17 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	arnd Bergmann <arnd@...db.de>
Cc:	luke Yang <luke.adi@...il.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Blackfin: arch patch for 2.6.18

Arnd wrote:
>Ok, looks good now. Just a few details that don't impact the
>functionality:

[snip]

What I committed (to our source) is:

+++ process.c   27 Sep 2006 15:32:46 -0000      1.42
@@ -101,10 +101,10 @@
  {
         while (!need_resched()) {
                 leds_switch(LED_OFF);
-             __asm__("nop;\n\t \
-                         nop;\n\t \
-                         nop;\n\t \
-                         idle;\n\t": : :"cc");
+               local_irq_disable();
+               if (likely( !need_resched()))
+                       idle_with_irq_disabled();
+               local_irq_enable();
                 leds_switch(LED_ON);
         }
  }

And in system.h, this was added (because this is where all the other 
inlines is which messes with the interrupts are - and irq_flags is already 
defined here)

+++ system.h    27 Sep 2006 15:32:51 -0000      1.24

+#define idle_with_irq_disabled() do {   \
+        __asm__ __volatile__ (          \
+                "nop; nop;\n"           \
+                ".align 8;\n"           \
+                "sti %0; idle;\n"       \
+                ::"d" (irq_flags));     \
+} while (0)

It seems to work OK.

Thanks for your help on this.

I think we have been weeding through everyone's comments, and have most 
things fixed up.

Are there any other major issues that you can see (that have not been 
pointed out).

-Robin
-
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