Fix the problem that large physical address support cannot be disabled when some platforms which only provides 36-bit support are selected. According to the philosophy of kernel config enabling a platform support doesn't mean the kernel is only running on that platform. Remove the auto selection of PHYS_64BIT option for these platforms. They will need to use a 36bit default config that selects PHYS_64BIT explicitly.
The reason why we need to keep PHYS_64BIT option configurable is that enabling it cause negative performance impact on various aspects like TLB miss and physical address manipulating. We should not enable it unless really needed, e.g. use large memory of 4GB or bigger. Signed-off-by: Li Yang <le...@freescale.com> --- arch/powerpc/platforms/85xx/Kconfig | 6 ------ 1 files changed, 0 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig index d7946be..d9bc0bd 100644 --- a/arch/powerpc/platforms/85xx/Kconfig +++ b/arch/powerpc/platforms/85xx/Kconfig @@ -80,7 +80,6 @@ config P1010_RDB config P1022_DS bool "Freescale P1022 DS" select DEFAULT_UIMAGE - select PHYS_64BIT # The DTS has 36-bit addresses select SWIOTLB help This option enables support for the Freescale P1022DS reference board. @@ -175,7 +174,6 @@ config P2041_RDB bool "Freescale P2041 RDB" select DEFAULT_UIMAGE select PPC_E500MC - select PHYS_64BIT select SWIOTLB select ARCH_REQUIRE_GPIOLIB select GPIO_MPC8XXX @@ -188,7 +186,6 @@ config P3041_DS bool "Freescale P3041 DS" select DEFAULT_UIMAGE select PPC_E500MC - select PHYS_64BIT select SWIOTLB select ARCH_REQUIRE_GPIOLIB select GPIO_MPC8XXX @@ -201,7 +198,6 @@ config P3060_QDS bool "Freescale P3060 QDS" select DEFAULT_UIMAGE select PPC_E500MC - select PHYS_64BIT select SWIOTLB select GPIO_MPC8XXX select HAS_RAPIDIO @@ -213,7 +209,6 @@ config P4080_DS bool "Freescale P4080 DS" select DEFAULT_UIMAGE select PPC_E500MC - select PHYS_64BIT select SWIOTLB select ARCH_REQUIRE_GPIOLIB select GPIO_MPC8XXX @@ -229,7 +224,6 @@ config P5020_DS select DEFAULT_UIMAGE select E500 select PPC_E500MC - select PHYS_64BIT select SWIOTLB select ARCH_REQUIRE_GPIOLIB select GPIO_MPC8XXX -- 1.5.4.3 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev