linux-kernel - [Patch 5/6] Scheduler support for HARDWARE

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Date:	Mon, 21 Apr 2008 17:33:04 -0700
From:	David Daney <ddaney@...rex.com>
To:	linux-mips@...ux-mips.org
Cc:	linux-kernel@...r.kernel.org
Subject: [Patch 5/6] Scheduler support for HARDWARE_WATCHPOINTS.

This is the meat of the patch.  Here we install the watch register values when we
schedule a new thread.

The implemtation of __restore_watch() is in asm/watch.h.  In the case where there
are no watch registers to install (the normal case) the overhead is 5 machine
instructions with gcc-3.4.3.

Signed-off-by: David Daney <ddaney@...rex.com>
---
 include/asm-mips/system.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index a944eda..cd30f83 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -20,6 +20,7 @@
 #include <asm/cmpxchg.h>
 #include <asm/cpu-features.h>
 #include <asm/dsp.h>
+#include <asm/watch.h>
 #include <asm/war.h>

@@ -76,6 +77,7 @@ do {									\
 		__restore_dsp(current);					\
 	if (cpu_has_userlocal)						\
 		write_c0_userlocal(current_thread_info()->tp_value);	\
+	__restore_watch();						\
 } while (0)

 static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
-- 
1.5.5

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