Per the spec, the default max memory region must be 1 covering
all system memory.
When platform does not provide ACPI MRRM table or
when CONFIG_ACPI is opted out, the acpi_mrrm_max_mem_region() function
defaults to returning 1 region complying to RDT spec.
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@xxxxxxxxx>
---
drivers/acpi/acpi_mrrm.c | 3 ++-
include/linux/acpi.h | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/acpi_mrrm.c b/drivers/acpi/acpi_mrrm.c
index 2f22f013959a..26c1a4e6b6ec 100644
--- a/drivers/acpi/acpi_mrrm.c
+++ b/drivers/acpi/acpi_mrrm.c
@@ -14,7 +14,8 @@
#include <linux/string.h>
#include <linux/sysfs.h>
-static int max_mem_region = -ENOENT;
+/* Default assume one memory region covering all system memory, per the spec */
+static int max_mem_region = 1;
/* Access for use by resctrl file system */
int acpi_mrrm_max_mem_region(void)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e72100c0684f..f102c0fe3431 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1101,7 +1101,7 @@ static inline acpi_handle acpi_get_processor_handle(int cpu)
static inline int acpi_mrrm_max_mem_region(void)
{
- return -ENOENT;
+ return 1;
}
#endif /* !CONFIG_ACPI */
--
2.47.1
