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Message-ID: <20070301071201.GC19339@Krystal>
Date: Thu, 1 Mar 2007 02:12:01 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: [PATCH] linux-kernel-markers-powerpc-optimization-flags
linux-kernel-markers-powerpc-optimization-flags
Add flag support to powerpc optimization
Fix the .section .markers, \"a\", @progbits;\n\t inline assembly :
adding the @progbits seems to remove a warning from the linker (forces
the section to DATA, which is the same a what the MARK_GENERIC version
does).
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -92,3 +92,4 @@ obj-$(CONFIG_PPC64) += $(obj64-y)
extra-$(CONFIG_PPC_FPU) += fpu.o
extra-$(CONFIG_PPC64) += entry_64.o
+obj-$(CONFIG_MARKERS_ENABLE_OPTIMIZATION) += marker.o
--- /dev/null
+++ b/arch/powerpc/kernel/marker.c
@@ -0,0 +1,25 @@
+/* marker.c
+ *
+ * Powerpc optimized marker enabling/disabling.
+ *
+ * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
+ */
+
+#include <linux/module.h>
+#include <linux/marker.h>
+#include <linux/string.h>
+#include <asm/cacheflush.h>
+
+int marker_optimized_set_enable(void *address, char enable)
+{
+ char newi[MARK_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET+1];
+ int size = MARK_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET
+ + sizeof(MARK_OPTIMIZED_ENABLE_TYPE);
+
+ memcpy(newi, address, size);
+ MARK_OPTIMIZED_ENABLE(&newi[0]) = enable;
+ memcpy(address, newi, size);
+ flush_icache_range((unsigned long)address, size);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(marker_optimized_set_enable);
diff --git a/include/asm-powerpc/marker.h b/include/asm-powerpc/marker.h
index 7ff8387..eeb6ad3 100644
--- a/include/asm-powerpc/marker.h
+++ b/include/asm-powerpc/marker.h
@@ -14,16 +14,18 @@
#ifdef CONFIG_MARKERS
-#define MARK(name, format, args...) \
+#define _MF_DEFAULT (_MF_OPTIMIZED | _MF_LOCKDEP | _MF_PRINTK)
+
+#define MARK_OPTIMIZED(flags, name, format, args...) \
do { \
static marker_probe_func *__mark_call_##name = \
__mark_empty_function; \
static const struct __mark_marker_c __mark_c_##name \
__attribute__((section(".markers.c"))) = \
{ #name, &__mark_call_##name, format, \
- MARKER_OPTIMIZED } ; \
+ (flags) | _MF_OPTIMIZED } ; \
char condition; \
- asm volatile( ".section .markers, \"a\";\n\t" \
+ asm volatile( ".section .markers, \"a\", @progbits;\n\t" \
PPC_LONG "%1, 0f;\n\t" \
".previous;\n\t" \
".align 4\n\t" \
@@ -39,11 +41,25 @@
} \
} while (0)
+#define _MARK(flags, format, args...) \
+do { \
+ if ((flags) & _MF_OPTIMIZED) \
+ MARK_OPTIMIZED(flags, format, ## args); \
+ else \
+ MARK_GENERIC(flags, format, ## args); \
+} while (0)
+
+#define MARK(format, args...) _MARK(_MF_DEFAULT, format, ## args)
/* Offset of the immediate value from the start of the addi instruction (result
* of the li mnemonic), in bytes. */
-#define MARK_ENABLE_IMMEDIATE_OFFSET 2
-#define MARK_ENABLE_TYPE short
-#define MARK_POLYMORPHIC
+#define MARK_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET 2
+#define MARK_OPTIMIZED_ENABLE_TYPE short
+/* Dereference enable as lvalue from a pointer to its instruction */
+#define MARK_OPTIMIZED_ENABLE(a) \
+ *(MARK_OPTIMIZED_ENABLE_TYPE*) \
+ ((char*)a+MARK_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET)
+
+extern int marker_optimized_set_enable(void *address, char enable);
#endif
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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