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Subject[PATCH] linux-kernel-markers-i386-optimization-flags
linux-kernel-markers-i386-optimization-flags

i386 marker optimization flags support.
Also fixes the @progbits assembly section declaration.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

--- a/arch/i386/kernel/marker.c
+++ b/arch/i386/kernel/marker.c
@@ -40,7 +40,7 @@ static int mark_notifier(struct notifier_block *nb,
{
enum die_val die_val = (enum die_val) val;
struct die_args *args = (struct die_args *)data;
-
+
if (!args->regs || user_mode_vm(args->regs))
return NOTIFY_DONE;

@@ -56,7 +56,7 @@ static struct notifier_block mark_notify = {
.priority = 0x7fffffff, /* we need to be notified first */
};

-int arch_marker_set_ins_enable(void *address, char enable)
+int marker_optimized_set_enable(void *address, char enable)
{
char saved_byte;
int ret;
@@ -91,4 +91,4 @@ int arch_marker_set_ins_enable(void *address, char enable)
flush_icache_range(address, size);
return 0;
}
-EXPORT_SYMBOL_GPL(arch_marker_set_ins_enable);
+EXPORT_SYMBOL_GPL(marker_optimized_set_enable);
--- a/include/asm-i386/marker.h
+++ b/include/asm-i386/marker.h
@@ -11,16 +11,19 @@


#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" \
".long %1, 0f;\n\t" \
".previous;\n\t" \
".align 2\n\t" \
@@ -36,12 +39,25 @@
} \
} while (0)

+#define _MARK(flags, format, args...) \
+do { \
+ if (((flags) & _MF_LOCKDEP) && ((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 movb instruction, in
* bytes. */
-#define MARK_ENABLE_IMMEDIATE_OFFSET 1
-#define MARK_ENABLE_TYPE char
-#define MARK_POLYMORPHIC
+#define MARK_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET 1
+#define MARK_OPTIMIZED_ENABLE_TYPE char
+/* 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 arch_marker_set_ins_enable(void *address, char enable);
+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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