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>

3 files changed, 16 insertions, 2 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f054778e916c..f1992dc5c424 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 2557514d7ef6..8d9f0b41ee86 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 f3f4f28c6960..c9ba2fdf807d 100644
--- a/include/linux/resume-trace.h
+++ b/include/linux/resume-trace.h
@@ -8,7 +8,7 @@ extern int pm_trace_enabled;
 
 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) \