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@xxxxxxxxxx>
---
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
