Commit 3f9bea2b authored by Chaitanya S Prakash's avatar Chaitanya S Prakash Committed by Andrew Morton
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selftests/mm: change NR_CHUNKS_HIGH for aarch64 

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: default avatarChaitanya S Prakash <chaitanyas.prakash@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3cce258e

tools/testing/selftests/mm/virtual_address_range.c

+10 −4
Original line number Diff line number Diff line
@@ -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;

}