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| author | Arjan van de Ven <arjan@infradead.org> | 2006-01-06 00:12:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:36 -0800 |
| commit | 37b73c828185731f6236a6387c02d7b08c150810 (patch) | |
| tree | 312b9f082f78072aba62ee2230e417928156873e | |
| parent | d89c145c0344fe2180336af6a309a59a8bc8c1c0 (diff) | |
| download | lwn-37b73c828185731f6236a6387c02d7b08c150810.tar.gz lwn-37b73c828185731f6236a6387c02d7b08c150810.zip | |
[PATCH] x86/x86_64: mark rodata section read only: generic infrastructure
Generic prep-work for marking the .rodata section readonly:
* Align the rodata section at 4Kb boundary
* call the mark_rodata_ro() function when available
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 4 | ||||
| -rw-r--r-- | init/main.c | 5 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 094d4917c1a9..35de20cf8fac 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -10,6 +10,8 @@ #define ALIGN_FUNCTION() . = ALIGN(8) #define RODATA \ + . = ALIGN(4096); \ + __start_rodata = .; \ .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ *(.rodata) *(.rodata.*) \ *(__vermagic) /* Kernel version magic */ \ @@ -74,6 +76,8 @@ __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ *(__ksymtab_strings) \ } \ + __end_rodata = .; \ + . = ALIGN(4096); \ \ /* Built-in module parameters. */ \ __param : AT(ADDR(__param) - LOAD_OFFSET) { \ diff --git a/init/main.c b/init/main.c index 54aaf561cf66..2ed3638deec7 100644 --- a/init/main.c +++ b/init/main.c @@ -52,6 +52,7 @@ #include <asm/bugs.h> #include <asm/setup.h> #include <asm/sections.h> +#include <asm/cacheflush.h> /* * This is one of the first .c files built. Error out early @@ -99,6 +100,9 @@ extern void acpi_early_init(void); #else static inline void acpi_early_init(void) { } #endif +#ifndef CONFIG_DEBUG_RODATA +static inline void mark_rodata_ro(void) { } +#endif #ifdef CONFIG_TC extern void tc_init(void); @@ -708,6 +712,7 @@ static int init(void * unused) */ free_initmem(); unlock_kernel(); + mark_rodata_ro(); system_state = SYSTEM_RUNNING; numa_default_policy(); |