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selftests/mm: change NR_CHUNKS_HIGH for aarch64

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Although there is a provision for 52 bit VA on arm64 platform, it remains
unutilised and higher addresses are not allocated.  In order to
accommodate 4PB [2^52] virtual address space where supported,
NR_CHUNKS_HIGH is changed accordingly.

Array holding addresses is changed from static allocation to dynamic
allocation to accommodate its voluminous nature which otherwise might
overflow the stack.

Link: https://lkml.kernel.org/r/20230323060121.1175830-3-chaitanyas.prakash@arm.com
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Chaitanya S Prakash 2023-03-23 11:31:20 +05:30 committed by Andrew Morton
parent 3cce258ea4
commit 3f9bea2b8a
1 changed files with 10 additions and 4 deletions
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14
tools/testing/selftests/mm/virtual_address_range.c
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@ -36,13 +36,15 @@
* till it reaches 512TB. One with size 128TB and the
* other being 384TB.
*
* On Arm64 the address space is 256TB and no high mappings
* are supported so far.
* On Arm64 the address space is 256TB and support for
* high mappings up to 4PB virtual address space has
* been added.
*/
#define NR_CHUNKS_128TB ((128 * SZ_1TB) / MAP_CHUNK_SIZE) /* Number of chunks for 128TB */
#define NR_CHUNKS_256TB (NR_CHUNKS_128TB * 2UL)
#define NR_CHUNKS_384TB (NR_CHUNKS_128TB * 3UL)
#define NR_CHUNKS_3840TB (NR_CHUNKS_128TB * 30UL)
#define ADDR_MARK_128TB (1UL << 47) /* First address beyond 128TB */
#define ADDR_MARK_256TB (1UL << 48) /* First address beyond 256TB */
@ -51,7 +53,7 @@
#define HIGH_ADDR_MARK ADDR_MARK_256TB
#define HIGH_ADDR_SHIFT 49
#define NR_CHUNKS_LOW NR_CHUNKS_256TB
#define NR_CHUNKS_HIGH 0
#define NR_CHUNKS_HIGH NR_CHUNKS_3840TB
#else
#define HIGH_ADDR_MARK ADDR_MARK_128TB
#define HIGH_ADDR_SHIFT 48
@ -101,7 +103,7 @@ static int validate_lower_address_hint(void)
int main(int argc, char *argv[])
{
char *ptr[NR_CHUNKS_LOW];
char *hptr[NR_CHUNKS_HIGH];
char **hptr;
char *hint;
unsigned long i, lchunks, hchunks;
@ -119,6 +121,9 @@ int main(int argc, char *argv[])
return 1;
}
lchunks = i;
hptr = (char **) calloc(NR_CHUNKS_HIGH, sizeof(char *));
if (hptr == NULL)
return 1;
for (i = 0; i < NR_CHUNKS_HIGH; i++) {
hint = hind_addr();
@ -139,5 +144,6 @@ int main(int argc, char *argv[])
for (i = 0; i < hchunks; i++)
munmap(hptr[i], MAP_CHUNK_SIZE);
free(hptr);
return 0;
}