Christophe reported that the change to ARCH_FORCE_MAX_ORDER to limit the range to 10 had broken his ability to configure hugepages:
# echo 1 > /sys/kernel/mm/hugepages/hugepages-8192kB/nr_hugepages sh: write error: Invalid argument Several of the powerpc defconfigs previously set the ARCH_FORCE_MAX_ORDER value to 12, via the definition in arch/powerpc/configs/fsl-emb-nonhw.config, used by: mpc85xx_defconfig mpc85xx_smp_defconfig corenet32_smp_defconfig corenet64_smp_defconfig mpc86xx_defconfig mpc86xx_smp_defconfig Fix it by increasing the allowed range to 12 to restore the previous behaviour. Fixes: 358e526a1648 ("powerpc/mm: Reinstate ARCH_FORCE_MAX_ORDER ranges") Reported-by: Christophe Leroy <christophe.le...@csgroup.eu> Signed-off-by: Michael Ellerman <m...@ellerman.id.au> Link: https://msgid.link/id:8011d806-5b30-bf26-2bfe-a08c39d57...@csgroup.eu --- arch/powerpc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Christophe, can you confirm this fixes your system? diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c831e20cf40f..8977fa73c09e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -928,7 +928,7 @@ config ARCH_FORCE_MAX_ORDER default "6" if PPC32 && PPC_64K_PAGES range 4 10 if PPC32 && PPC_256K_PAGES default "4" if PPC32 && PPC_256K_PAGES - range 10 10 + range 10 12 default "10" help The kernel page allocator limits the size of maximal physically -- 2.41.0