The low and high limit passed to vm_unmapped_area() in
hugetlb_get_unmapped_area() is (TASK_UNMAPPED_BASE, TASK_SIZE).
On 64-bit kernel this is defined as:
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
For 32-bit (-m31) process, this can be as small as
(0x40000000, 0x80000000), which is 0x40000000 bytes long area.
This testcase however is trying to allocate 0x60000000 and fails:
FAIL mmap() 1: Cannot allocate memory
Lower mmap size to ~0x20000000, which is more likely to suit
address space constraints of 32-bit s390.
Signed-off-by: Jan Stancek <[email protected]>
---
tests/map_high_truncate_2.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/tests/map_high_truncate_2.c b/tests/map_high_truncate_2.c
index daabd00..2a2560b 100644
--- a/tests/map_high_truncate_2.c
+++ b/tests/map_high_truncate_2.c
@@ -50,7 +50,11 @@
* 856fc29505556cf263f3dcda2533cf3766c14ab6.
*/
#define MAP_LENGTH (4 * hpage_size)
-#define TRUNCATE_POINT 0x60000000UL
+#if defined(__s390__) && __WORDSIZE == 32
+#define TRUNCATE_POINT 0x20000000UL
+#else
+#define TRUNCATE_POINT 0x60000000UL
+#endif
#define HIGH_ADDR 0xa0000000UL
int main(int argc, char *argv[])
--
1.7.1
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