Commit b4e0409a authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: check vmlinux limits, 64-bit 



these build-time and link-time checks would have prevented the
vmlinux size regression.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 223ac2f4

arch/x86/kernel/head64.c

+13 −0
Original line number Diff line number Diff line
@@ -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();

arch/x86/kernel/vmlinux_64.lds.S

+6 −0
Original line number Diff line number Diff line
@@ -247,3 +247,9 @@ SECTIONS 


  DWARF_DEBUG

}



/*

 * Build-time check on the image size:

 */

ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),

	"kernel image bigger than KERNEL_IMAGE_SIZE")

arch/x86/mm/fault.c

+0 −4
Original line number Diff line number Diff line
@@ -976,9 +976,5 @@ void vmalloc_sync_all(void) 
		if (address == start)

			start = address + PGDIR_SIZE;

	}

	/* Check that there is no need to do the same for the modules area. */

	BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));

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

				(__START_KERNEL & PGDIR_MASK)));

#endif

}