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Date: Fri, 11 Jan 2008 09:17:39 +0000
From: "Jan Beulich" <jbeulich@...ell.com>
To: <linux-kernel@...r.kernel.org>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH] make .tracedata a normal part of RODATA()
.. allowing it to be write-protected just as other read-only data
under CONFIG_DEBUG_RODATA.
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
arch/x86/kernel/vmlinux_32.lds.S | 7 -------
arch/x86/kernel/vmlinux_64.lds.S | 7 -------
drivers/base/power/trace.c | 2 +-
include/asm-generic/vmlinux.lds.h | 14 ++++++++++++++
include/asm-x86/resume-trace_32.h | 2 +-
include/asm-x86/resume-trace_64.h | 4 ++--
include/linux/resume-trace.h | 2 +-
7 files changed, 19 insertions(+), 19 deletions(-)
--- linux-2.6.24-rc7/arch/x86/kernel/vmlinux_32.lds.S 2008-01-10 16:53:55.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/arch/x86/kernel/vmlinux_32.lds.S 2007-12-18 16:36:00.000000000 +0100
@@ -64,13 +64,6 @@ SECTIONS
BUG_TABLE :text
- . = ALIGN(4);
- .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
- __tracedata_start = .;
- *(.tracedata)
- __tracedata_end = .;
- }
-
RODATA
/* writeable */
--- linux-2.6.24-rc7/arch/x86/kernel/vmlinux_64.lds.S 2008-01-10 16:53:55.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/arch/x86/kernel/vmlinux_64.lds.S 2007-12-20 16:08:56.000000000 +0100
@@ -54,13 +54,6 @@ SECTIONS
RODATA
- . = ALIGN(4);
- .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
- __tracedata_start = .;
- *(.tracedata)
- __tracedata_end = .;
- }
-
. = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
/* Data */
.data : AT(ADDR(.data) - LOAD_OFFSET) {
--- linux-2.6.24-rc7/drivers/base/power/trace.c 2008-01-10 16:54:00.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/drivers/base/power/trace.c 2007-12-18 16:30:48.000000000 +0100
@@ -153,7 +153,7 @@ EXPORT_SYMBOL(set_trace_device);
* it's not any guarantee, but it's a high _likelihood_ that
* the match is valid).
*/
-void generate_resume_trace(void *tracedata, unsigned int user)
+void generate_resume_trace(const void *tracedata, unsigned int user)
{
unsigned short lineno = *(unsigned short *)tracedata;
const char *file = *(const char **)(tracedata + 2);
--- linux-2.6.24-rc7/include/asm-generic/vmlinux.lds.h 2008-01-10 16:55:01.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/include/asm-generic/vmlinux.lds.h 2007-12-19 12:31:00.000000000 +0100
@@ -57,6 +57,8 @@
VMLINUX_SYMBOL(__end_rio_route_ops) = .; \
} \
\
+ TRACEDATA \
+ \
/* Kernel symbol table: Normal symbols */ \
__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab) = .; \
@@ -229,6 +231,18 @@
__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) = .; \
--- linux-2.6.24-rc7/include/asm-x86/resume-trace_32.h 2008-01-10 16:55:10.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/include/asm-x86/resume-trace_32.h 2007-12-18 16:31:48.000000000 +0100
@@ -1,6 +1,6 @@
#define TRACE_RESUME(user) do { \
if (pm_trace_enabled) { \
- void *tracedata; \
+ const void *tracedata; \
asm volatile("movl $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n" \
--- linux-2.6.24-rc7/include/asm-x86/resume-trace_64.h 2008-01-10 16:55:10.000000000 +0100
+++ 2.6.24-rc7-resume-trace-rodata/include/asm-x86/resume-trace_64.h 2007-12-19 12:00:47.000000000 +0100
@@ -1,7 +1,7 @@
#define TRACE_RESUME(user) do { \
if (pm_trace_enabled) { \
- void *tracedata; \
- asm volatile("movq $1f,%0\n" \
+ const void *tracedata; \
+ asm volatile("leaq 1f(%rip),%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n" \
"\t.quad %c2\n" \
--- linux-2.6.24-rc7/include/linux/resume-trace.h 2007-10-09 22:31:38.000000000 +0200
+++ 2.6.24-rc7-resume-trace-rodata/include/linux/resume-trace.h 2007-12-18 16:31:30.000000000 +0100
@@ -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) \
--
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