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authorJan Beulich <jbeulich@novell.com>2008-12-16 11:45:56 +0000
committerIngo Molnar <mingo@elte.hu>2008-12-16 18:42:51 +0100
commitbeeb4195cbc80b7489631361b7ed38b7518af433 (patch)
treef932712a4d614004b2abb1ae9c4d1169805ac991 /arch
parentb93a531e315e97ef00367099e6b5f19651936e20 (diff)
x86, 32-bit: add some compile time checks to mem_init()
Some of the inconsistencies checked for at run time can be detected at build time already, so duplicate the checks done at run time to also be done at build time. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/init_32.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index c483f424207..d3a45d54547 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -1040,11 +1040,25 @@ void __init mem_init(void)
(unsigned long)&_text, (unsigned long)&_etext,
((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+ /*
+ * Check boundaries twice: Some fundamental inconsistencies can
+ * be detected at build time already.
+ */
+#define __FIXADDR_TOP (-PAGE_SIZE)
+#ifdef CONFIG_HIGHMEM
+ BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
+ BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
+#endif
+#define high_memory (-128UL << 20)
+ BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
+#undef high_memory
+#undef __FIXADDR_TOP
+
#ifdef CONFIG_HIGHMEM
BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
BUG_ON(VMALLOC_END > PKMAP_BASE);
#endif
- BUG_ON(VMALLOC_START > VMALLOC_END);
+ BUG_ON(VMALLOC_START >= VMALLOC_END);
BUG_ON((unsigned long)high_memory > VMALLOC_START);
if (boot_cpu_data.wp_works_ok < 0)