FIX mmap() alignment for devdax == 2 MB

Author: ldorau

src/provider/provider_devdax_memory.c

@@ -32,7 +32,7 @@ umf_memory_provider_ops_t *umfDevDaxMemoryProviderOps(void) {
 #include "utils_concurrency.h"
 #include "utils_log.h"
 
-#define NODESET_STR_BUF_LEN 1024
+#define DEVDAX_ALIGNMENT_2MB (2 * 1024 * 1024) // == 2 MB
 
 #define TLS_MSG_BUF_LEN 1024
 
@@ -539,11 +539,11 @@ static umf_result_t devdax_open_ipc_handle(void *provider,
     unsigned map_sync_flag = 0;
     utils_translate_mem_visibility_flag(UMF_MEM_MAP_SYNC, &map_sync_flag);
 
-    // length and offset passed to mmap() have to be page-aligned
+    // length and offset passed to mmap() have to be 2MB-aligned
     size_t offset_aligned = devdax_ipc_data->offset;
     size_t length_aligned = devdax_ipc_data->length;
     utils_align_ptr_down_size_up((void **)&offset_aligned, &length_aligned,
-                                 utils_get_page_size());
+                                 DEVDAX_ALIGNMENT_2MB);
 
     // mmap /dev/dax with the MAP_SYNC xor MAP_SHARED flag (if MAP_SYNC fails)
     char *addr =
@@ -581,8 +581,8 @@ static umf_result_t devdax_close_ipc_handle(void *provider, void *ptr,
         return UMF_RESULT_ERROR_INVALID_ARGUMENT;
     }
 
-    // ptr and size passed to munmap() have to be page-aligned
-    utils_align_ptr_down_size_up(&ptr, &size, utils_get_page_size());
+    // ptr and size passed to munmap() have to be 2MB-aligned
+    utils_align_ptr_down_size_up(&ptr, &size, DEVDAX_ALIGNMENT_2MB);
 
     errno = 0;
     int ret = utils_munmap(ptr, size);