The current arm64 default config limits max NUMA nodes available on system to 4 (NODES_SHIFT = 2). Today's arm64 systems can reach or exceed 16 NUMA nodes. To accomodate current hardware and to fit NODES_SHIFT within page flags on arm64, increase NODES_SHIFT to 4.
Discussion on v1 of the patch: https://lkml.org/lkml/2020/10/20/767 Signed-off-by: Vanshidhar Konda <[email protected]> --- arch/arm64/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f858c352f72a..cffcc677011f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -982,7 +982,7 @@ config NUMA config NODES_SHIFT int "Maximum NUMA Nodes (as a power of 2)" range 1 10 - default "2" + default "4" depends on NEED_MULTIPLE_NODES help Specify the maximum number of NUMA Nodes available on the target -- 2.28.0
