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authorIngo Molnar <mingo@elte.hu>2008-02-21 13:45:16 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:40:45 +0200
commitb4e0409a36f4533770a12095bde2a574a08a319e (patch)
treeb160009adc4a6fb836dcd277da668c6a174c273f /arch/x86/kernel/head64.c
parent223ac2f42d49dd0324ca02ea15897ead1a2f5133 (diff)
downloadop-kernel-dev-b4e0409a36f4533770a12095bde2a574a08a319e.zip
op-kernel-dev-b4e0409a36f4533770a12095bde2a574a08a319e.tar.gz
x86: check vmlinux limits, 64-bit
these build-time and link-time checks would have prevented the vmlinux size regression. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/head64.c')
-rw-r--r--arch/x86/kernel/head64.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index ad24408..38f32e7 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -82,6 +82,19 @@ void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
+ /*
+ * Build-time sanity checks on the kernel image and module
+ * area mappings. (these are purely build-time and produce no code)
+ */
+ BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
+ BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
+ BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
+ BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
+ BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
+ BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
+ BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
+ (__START_KERNEL & PGDIR_MASK)));
+
/* clear bss before set_intr_gate with early_idt_handler */
clear_bss();
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