Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=522d8dc08b16deb51c128d544ab1cb9c621c950e
Commit: 522d8dc08b16deb51c128d544ab1cb9c621c950e
Parent: b90b34c6802865d07f482650eff82a4b38df6d79
Author: Martin Schwidefsky <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 9 18:24:31 2008 +0100
Committer: Martin Schwidefsky <[EMAIL PROTECTED]>
CommitDate: Sat Feb 9 18:24:38 2008 +0100
[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 <[EMAIL PROTECTED]>
---
include/asm-s390/pgtable.h | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 3f52075..65d3338 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)
/*
-
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