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[PATCH] x86/x86_64: mark rodata section read-only: make some datastructures const

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Mark some key kernel datastructures readonly.  This patch was previously
posted on Jun 28th but was back then not merged because nothing was enforcing
rodata anyway..  well that changed now :)

Patch by Christoph Lameter <christoph@lameter.com> and Dave Jones
<davej@redhat.com>

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Arjan van de Ven 2006-01-06 00:12:05 -08:00 committed by Linus Torvalds
parent 67df197b1a
commit bb152f5312
4 changed files with 3 additions and 3 deletions
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1
arch/i386/kernel/entry.S
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@ -657,6 +657,7 @@ ENTRY(spurious_interrupt_bug)
pushl $do_spurious_interrupt_bug
jmp error_code
.section .rodata,"a"
#include "syscall_table.S"
syscall_table_size=(.-sys_call_table)

1
arch/i386/kernel/syscall_table.S
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@ -1,4 +1,3 @@
.data
ENTRY(sys_call_table)
.long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
.long sys_exit

2
arch/x86_64/ia32/ia32entry.S
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@ -341,7 +341,7 @@ ENTRY(ia32_ptregs_common)
jmp ia32_sysret /* misbalances the return cache */
CFI_ENDPROC
.data
.section .rodata,"a"
.align 8
.globl ia32_sys_call_table
ia32_sys_call_table:

2
arch/x86_64/kernel/syscall.c
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@ -19,7 +19,7 @@ typedef void (*sys_call_ptr_t)(void);
extern void sys_ni_syscall(void);
sys_call_ptr_t sys_call_table[__NR_syscall_max+1] __cacheline_aligned = {
const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
/* Smells like a like a compiler bug -- it doesn't work when the & below is removed. */
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#include <asm-x86_64/unistd.h>