Commit 522d8dc0 authored by Martin Schwidefsky's avatar Martin Schwidefsky

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent b90b34c6
...@@ -127,8 +127,9 @@ extern char empty_zero_page[PAGE_SIZE]; ...@@ -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 * 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. * VMEM_MAP is static but the size of struct page can change.
*/ */
#define VMEM_MAX_PHYS min(VMALLOC_START, ((VMEM_MAP_END - VMALLOC_END) / \ #define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page))
sizeof(struct page) * PAGE_SIZE) & ~((16 << 20) - 1)) #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) #define VMEM_MAP ((struct page *) VMALLOC_END)
/* /*
......
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