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ACPI: MRRM: Fix default max memory region

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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@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://patch.msgid.link/20250523172001.1761634-1-anil.s.keshavamurthy@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Anil S Keshavamurthy 2025-05-23 13:20:01 -04:00 • committed by Rafael J. Wysocki
parent 8e66be071b
commit 059717c2ba
2 changed files with 3 additions and 2 deletions
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3
drivers/acpi/acpi_mrrm.c
View file

@ -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)

2
include/linux/acpi.h
View file

@ -1098,7 +1098,7 @@ 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 */