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Date: Fri, 05 Sep 2008 13:03:17 +0100
From: "Jan Beulich" <jbeulich@...ell.com>
To: <sam@...nborg.org>
Cc: <linux-kernel@...r.kernel.org>
Subject: [PATCH] .init.rodata and modpost adjustments
- first of all, add .init.rodata to INIT_DATA
- second, add .init.rodata and .init.setup to modpost's
ALL_INIT_DATA_SECTIONS
- third, generalize the pattern used by modpost's *INIT_SECTIONS and
EXIT_SECTIONS, and use them for ALL_{INIT,EXIT}_SECTIONS
- fourth, warn about cross references between .cpuinit.* and .meminit.*+
- finally, put all __setup_str* symbols in .init.rodata (and mark them
'const')
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
---
include/asm-generic/vmlinux.lds.h | 5 ++-
include/linux/init.h | 3 +-
scripts/mod/modpost.c | 50 +++++++++++++++++++++++++++++---------
3 files changed, 44 insertions(+), 14 deletions(-)
--- linux-2.6.27-rc5/include/asm-generic/vmlinux.lds.h 2008-08-21 14:37:33.000000000 +0200
+++ 2.6.27-rc5-initconst/include/asm-generic/vmlinux.lds.h 2008-09-01 15:24:57.000000000 +0200
@@ -264,10 +264,11 @@
#define INIT_DATA \
*(.init.data) \
DEV_DISCARD(init.data) \
- DEV_DISCARD(init.rodata) \
CPU_DISCARD(init.data) \
- CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.data) \
+ *(.init.rodata) \
+ DEV_DISCARD(init.rodata) \
+ CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.rodata)
#define INIT_TEXT \
--- linux-2.6.27-rc5/include/linux/init.h 2008-08-21 14:37:35.000000000 +0200
+++ 2.6.27-rc5-initconst/include/linux/init.h 2008-09-01 17:36:19.000000000 +0200
@@ -227,7 +227,8 @@ struct obs_kernel_param {
* obs_kernel_param "array" too far apart in .init.setup.
*/
#define __setup_param(str, unique_id, fn, early) \
- static char __setup_str_##unique_id[] __initdata __aligned(1) = str; \
+ static const char __setup_str_##unique_id[] __initconst \
+ __aligned(1) = str; \
static struct obs_kernel_param __setup_##unique_id \
__used __section(.init.setup) \
__attribute__((aligned((sizeof(long))))) \
--- linux-2.6.27-rc5/scripts/mod/modpost.c 2008-08-21 14:37:36.000000000 +0200
+++ 2.6.27-rc5-initconst/scripts/mod/modpost.c 2008-09-01 15:27:26.000000000 +0200
@@ -753,6 +753,8 @@ static int check_section(const char *mod
#define ALL_INIT_DATA_SECTIONS \
+ ".init.setup$", ".init.rodata$", \
+ ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \
".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
#define ALL_EXIT_DATA_SECTIONS \
".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
@@ -762,21 +764,23 @@ static int check_section(const char *mod
#define ALL_EXIT_TEXT_SECTIONS \
".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
-#define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS
-#define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS
+#define ALL_INIT_SECTIONS INIT_SECTIONS, DEV_INIT_SECTIONS, \
+ CPU_INIT_SECTIONS, MEM_INIT_SECTIONS
+#define ALL_EXIT_SECTIONS EXIT_SECTIONS, DEV_EXIT_SECTIONS, \
+ CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS
#define DATA_SECTIONS ".data$", ".data.rel$"
#define TEXT_SECTIONS ".text$"
-#define INIT_SECTIONS ".init.data$", ".init.text$"
-#define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$"
-#define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$"
-#define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$"
-
-#define EXIT_SECTIONS ".exit.data$", ".exit.text$"
-#define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$"
-#define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$"
-#define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$"
+#define INIT_SECTIONS ".init.*"
+#define DEV_INIT_SECTIONS ".devinit.*"
+#define CPU_INIT_SECTIONS ".cpuinit.*"
+#define MEM_INIT_SECTIONS ".meminit.*"
+
+#define EXIT_SECTIONS ".exit.*"
+#define DEV_EXIT_SECTIONS ".devexit.*"
+#define CPU_EXIT_SECTIONS ".cpuexit.*"
+#define MEM_EXIT_SECTIONS ".memexit.*"
/* init data sections */
static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
@@ -868,12 +872,36 @@ const struct sectioncheck sectioncheck[]
.tosec = { INIT_SECTIONS, NULL },
.mismatch = XXXINIT_TO_INIT,
},
+/* Do not reference cpuinit code/data from meminit code/data */
+{
+ .fromsec = { MEM_INIT_SECTIONS, NULL },
+ .tosec = { CPU_INIT_SECTIONS, NULL },
+ .mismatch = XXXINIT_TO_INIT,
+},
+/* Do not reference meminit code/data from cpuinit code/data */
+{
+ .fromsec = { CPU_INIT_SECTIONS, NULL },
+ .tosec = { MEM_INIT_SECTIONS, NULL },
+ .mismatch = XXXINIT_TO_INIT,
+},
/* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
{
.fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
.tosec = { EXIT_SECTIONS, NULL },
.mismatch = XXXEXIT_TO_EXIT,
},
+/* Do not reference cpuexit code/data from memexit code/data */
+{
+ .fromsec = { MEM_EXIT_SECTIONS, NULL },
+ .tosec = { CPU_EXIT_SECTIONS, NULL },
+ .mismatch = XXXEXIT_TO_EXIT,
+},
+/* Do not reference memexit code/data from cpuexit code/data */
+{
+ .fromsec = { CPU_EXIT_SECTIONS, NULL },
+ .tosec = { MEM_EXIT_SECTIONS, NULL },
+ .mismatch = XXXEXIT_TO_EXIT,
+},
/* Do not use exit code/data from init code */
{
.fromsec = { ALL_INIT_SECTIONS, NULL },
--
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