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[PATCH] add __[start|end]_rodata sections to asm-generic/sections.h

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Add __start_rodata and __end_rodata to sections.h to avoid extern
declarations.  Needed by s390 code (see following patch).

[akpm@osdl.org: update architectures]
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens 2006-07-01 04:36:30 -07:00 committed by Linus Torvalds
parent e2c2770096
commit a581c2a469
4 changed files with 10 additions and 11 deletions
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9
arch/i386/mm/init.c
View File

@ -725,16 +725,15 @@ static int noinline do_test_wp_bit(void)
#ifdef CONFIG_DEBUG_RODATA
extern char __start_rodata, __end_rodata;
void mark_rodata_ro(void)
{
unsigned long addr = (unsigned long)&__start_rodata;
unsigned long addr = (unsigned long)__start_rodata;
for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
printk ("Write protecting the kernel read-only data: %luk\n",
(unsigned long)(&__end_rodata - &__start_rodata) >> 10);
printk("Write protecting the kernel read-only data: %uk\n",
(__end_rodata - __start_rodata) >> 10);
/*
* change_page_attr() requires a global_flush_tlb() call after it.

4
arch/parisc/mm/init.c
View File

@ -27,6 +27,7 @@
#include <asm/tlb.h>
#include <asm/pdc_chassis.h>
#include <asm/mmzone.h>
#include <asm/sections.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
@ -417,11 +418,10 @@ void free_initmem(void)
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void)
{
extern char __start_rodata, __end_rodata;
/* rodata memory was already mapped with KERNEL_RO access rights by
pagetable_init() and map_pages(). No need to do additional stuff here */
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(unsigned long)(&__end_rodata - &__start_rodata) >> 10);
(unsigned long)(__end_rodata - __start_rodata) >> 10);
}
#endif

7
arch/x86_64/mm/init.c
View File

@ -678,16 +678,15 @@ void free_initmem(void)
#ifdef CONFIG_DEBUG_RODATA
extern char __start_rodata, __end_rodata;
void mark_rodata_ro(void)
{
unsigned long addr = (unsigned long)&__start_rodata;
unsigned long addr = (unsigned long)__start_rodata;
for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
change_page_attr_addr(addr, 1, PAGE_KERNEL_RO);
printk ("Write protecting the kernel read-only data: %luk\n",
(&__end_rodata - &__start_rodata) >> 10);
(__end_rodata - __start_rodata) >> 10);
/*
* change_page_attr_addr() requires a global_flush_tlb() call after it.

1
include/asm-generic/sections.h
View File

@ -14,5 +14,6 @@ extern char _end[];
extern char __per_cpu_start[], __per_cpu_end[];
extern char __kprobes_text_start[], __kprobes_text_end[];
extern char __initdata_begin[], __initdata_end[];
extern char __start_rodata[], __end_rodata[];
#endif /* _ASM_GENERIC_SECTIONS_H_ */