Commit 66d4bdf2 authored by Jan Beulich's avatar Jan Beulich Committed by Ingo Molnar
Browse files

x86-64: fix overlap of modules and fixmap areas 



Plus add a build time check so this doesn't go unnoticed again.

Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9744f5a3

arch/x86/kernel/head64.c

+1 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ void __init x86_64_start_kernel(char * real_mode_data) 
	BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));

	BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==

				(__START_KERNEL & PGDIR_MASK)));

	BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);



	/* clear bss before set_intr_gate with early_idt_handler */

	clear_bss();

include/asm-x86/pgtable_64.h

+1 −1
Original line number Diff line number Diff line
@@ -151,7 +151,7 @@ static inline void native_pgd_clear(pgd_t *pgd) 
#define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)

#define VMEMMAP_START	 _AC(0xffffe20000000000, UL)

#define MODULES_VADDR    _AC(0xffffffffa0000000, UL)

#define MODULES_END      _AC(0xfffffffffff00000, UL)

#define MODULES_END      _AC(0xffffffffff000000, UL)

#define MODULES_LEN   (MODULES_END - MODULES_VADDR)



#ifndef __ASSEMBLY__