The patch titled
Subject: selftests/mm: change NR_CHUNKS_HIGH for aarch64
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-change-nr_chunks_high-for-aarch64.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-change-nr_chunks_high-for-aarch64.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Chaitanya S Prakash <chaitanyas.prakash@xxxxxxx>
Subject: selftests/mm: change NR_CHUNKS_HIGH for aarch64
Date: Thu, 23 Mar 2023 11:31:20 +0530
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@xxxxxxx
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/virtual_address_range.c | 14 +++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
--- a/tools/testing/selftests/mm/virtual_address_range.c~selftests-mm-change-nr_chunks_high-for-aarch64
+++ a/tools/testing/selftests/mm/virtual_address_range.c
@@ -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(v
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;
}
_
Patches currently in -mm which might be from chaitanyas.prakash@xxxxxxx are
selftests-mm-change-map_chunk_size.patch
selftests-mm-change-nr_chunks_high-for-aarch64.patch
selftests-mm-set-overcommit_policy-as-overcommit_always.patch
