From 522d8dc08b16deb51c128d544ab1cb9c621c950e Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky <schwidefsky@de.ibm.com> Date: Sat, 9 Feb 2008 18:24:31 +0100 Subject: [PATCH] [S390] VMEM_MAX_PHYS overflow on 31 bit. With the new space saving spinlock_t and a non-debug configuration the struct page only has 32 bytes for 31 bit s390. The causes an overflow in the calculation of VMEM_MAX_PHYS which renders the kernel unbootable. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> --- include/asm-s390/pgtable.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index 3f520754e71c..65d333849150 100644 --- a/include/asm-s390/pgtable.h +++ b/include/asm-s390/pgtable.h @@ -127,8 +127,9 @@ extern char empty_zero_page[PAGE_SIZE]; * mapping. This needs to be calculated at compile time since the size of the * VMEM_MAP is static but the size of struct page can change. */ -#define VMEM_MAX_PHYS min(VMALLOC_START, ((VMEM_MAP_END - VMALLOC_END) / \ - sizeof(struct page) * PAGE_SIZE) & ~((16 << 20) - 1)) +#define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page)) +#define VMEM_MAX_PFN min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES) +#define VMEM_MAX_PHYS ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1)) #define VMEM_MAP ((struct page *) VMALLOC_END) /* -- 2.34.1