[PATCH] Read only syscall tables for x86_64 and i386

[Christoph Lameter <christoph@lameter.com>]

Place x86_64 and i386 syscall table into the read only section.

Remove the syscall tables from the data section and place them into the 
readonly section (like IA64).

Signed-off-by: Christoph Lameter <christoph@scalex86.org>

Index: linux-2.6.12-mm2/arch/i386/kernel/entry.S
===================================================================
--- linux-2.6.12-mm2.orig/arch/i386/kernel/entry.S	2005-06-28 17:46:31.000000000 +0000
+++ linux-2.6.12-mm2/arch/i386/kernel/entry.S	2005-06-28 17:47:11.000000000 +0000
@@ -680,6 +680,7 @@ 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)
Index: linux-2.6.12-mm2/arch/i386/kernel/syscall_table.S
===================================================================
--- linux-2.6.12-mm2.orig/arch/i386/kernel/syscall_table.S	2005-06-28 17:46:31.000000000 +0000
+++ linux-2.6.12-mm2/arch/i386/kernel/syscall_table.S	2005-06-28 17:47:11.000000000 +0000
@@ -1,4 +1,3 @@
-.data
 ENTRY(sys_call_table)
 	.long sys_restart_syscall	/* 0 - old "setup()" system call, used for restarting */
 	.long sys_exit
Index: linux-2.6.12-mm2/arch/x86_64/kernel/syscall.c
===================================================================
--- linux-2.6.12-mm2.orig/arch/x86_64/kernel/syscall.c	2005-06-17 19:48:29.000000000 +0000
+++ linux-2.6.12-mm2/arch/x86_64/kernel/syscall.c	2005-06-28 18:22:41.000000000 +0000
@@ -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>