x86: move tracedata to RODATA
.. allowing it to be write-protected just as other read-only data
under CONFIG_DEBUG_RODATA.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f054778..f1992dc 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -93,6 +93,8 @@
VMLINUX_SYMBOL(__end_rio_route_ops) = .; \
} \
\
+ TRACEDATA \
+ \
/* Kernel symbol table: Normal symbols */ \
__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab) = .; \
@@ -318,6 +320,18 @@
__stop___bug_table = .; \
}
+#ifdef CONFIG_PM_TRACE
+#define TRACEDATA \
+ . = ALIGN(4); \
+ .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
+ __tracedata_start = .; \
+ *(.tracedata) \
+ __tracedata_end = .; \
+ }
+#else
+#define TRACEDATA
+#endif
+
#define NOTES \
.notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start_notes) = .; \
diff --git a/include/asm-x86/resume-trace.h b/include/asm-x86/resume-trace.h
index 2557514..8d9f0b4 100644
--- a/include/asm-x86/resume-trace.h
+++ b/include/asm-x86/resume-trace.h
@@ -6,7 +6,7 @@
#define TRACE_RESUME(user) \
do { \
if (pm_trace_enabled) { \
- void *tracedata; \
+ const void *tracedata; \
asm volatile(_ASM_MOV_UL " $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n\t" \
diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h
index f3f4f28..c9ba2fd 100644
--- a/include/linux/resume-trace.h
+++ b/include/linux/resume-trace.h
@@ -8,7 +8,7 @@
struct device;
extern void set_trace_device(struct device *);
-extern void generate_resume_trace(void *tracedata, unsigned int user);
+extern void generate_resume_trace(const void *tracedata, unsigned int user);
#define TRACE_DEVICE(dev) do { \
if (pm_trace_enabled) \