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commit f008e0d18a4ba8ac26b67c5989efde3406bce535
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Author: Jan Stancek <jstancek@redhat.com>
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Date: Fri Dec 5 13:57:04 2014 +0100
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lower mmap size of map_high_truncate_2 on 32bit s390
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The low and high limit passed to vm_unmapped_area() in
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hugetlb_get_unmapped_area() is (TASK_UNMAPPED_BASE, TASK_SIZE).
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On 64-bit kernel this is defined as:
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#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
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(1UL << 30) : (1UL << 41))
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#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
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For 32-bit (-m31) process, this can be as small as
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(0x40000000, 0x80000000), which is 0x40000000 bytes long area.
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This testcase however is trying to allocate 0x60000000 and fails:
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FAIL mmap() 1: Cannot allocate memory
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Lower mmap size to ~0x20000000, which is more likely to suit
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address space constraints of 32-bit s390.
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Signed-off-by: Jan Stancek <jstancek@redhat.com>
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Signed-off-by: Eric B Munson <emunson@mgebm.net>
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diff --git a/tests/map_high_truncate_2.c b/tests/map_high_truncate_2.c
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index daabd00..2a2560b 100644
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--- a/tests/map_high_truncate_2.c
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+++ b/tests/map_high_truncate_2.c
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@@ -50,7 +50,11 @@
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* 856fc29505556cf263f3dcda2533cf3766c14ab6.
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*/
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#define MAP_LENGTH (4 * hpage_size)
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-#define TRUNCATE_POINT 0x60000000UL
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+#if defined(__s390__) && __WORDSIZE == 32
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+#define TRUNCATE_POINT 0x20000000UL
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+#else
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+#define TRUNCATE_POINT 0x60000000UL
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+#endif
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#define HIGH_ADDR 0xa0000000UL
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int main(int argc, char *argv[])
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