The fixed address passed to mmap() should be aligned to the value of SHMLBA
as defined in sys/shm.h.
See Documentation/cachetlb.txt in the kernel for the explanation behind this.
On most architectures this value is the page size, but not on all.
Regards,
Martin
Signed-off-by: Martin Habets <[EMAIL PROTECTED]>
Index: ltp/testcases/kernel/syscalls/mmap/mmap01.c
===================================================================
--- ltp.orig/testcases/kernel/syscalls/mmap/mmap01.c 2008-05-01
21:03:51.000000000 +0100
+++ ltp/testcases/kernel/syscalls/mmap/mmap01.c 2008-05-01 21:10:45.000000000
+0100
@@ -81,6 +81,7 @@
#include <stdint.h>
#include <sys/stat.h>
#include <sys/mman.h>
+#include <sys/shm.h>
#include "test.h"
#include "usctest.h"
@@ -267,14 +268,16 @@
}
/*
- * Initialize addr to align with the first page boundary above the
- * break address of the process.
+ * Initialize addr to align with the first segment boundary address
+ * above the break address of the process.
*/
- addr = (void *) (((intptr_t)sbrk(0) + (page_sz - 1)) & ~(page_sz - 1));
+ addr = (void *) (((intptr_t)sbrk(0) + (SHMLBA - 1)) & ~(SHMLBA - 1));
- /* Increase the break address of the process by 2 page size bytes */
- if ((intptr_t)sbrk(2 * page_sz) == -1) {
- tst_brkm(TFAIL, cleanup, "sbrk(2 * page_sz) failed");
+ /* Set the break address of the process to the addr plus one
+ * page size.
+ */
+ if ((intptr_t)sbrk(SHMLBA + page_sz) == -1) {
+ tst_brkm(TFAIL, cleanup, "sbrk(SHMLBA + page_sz) failed");
}
/* Initialize one page region from addr with 'A' */
-------------------------------------------------------------------------
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