| Message ID | 1424853601-6675-19-git-send-email-hanjun.guo@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Wed, 25 Feb 2015 16:39:58 +0800 , Hanjun Guo <hanjun.guo@linaro.org> wrote: > From: Al Stone <al.stone@linaro.org> > > ACPI reduced hardware mode is disabled by default, but ARM64 > can only run properly in ACPI hardware reduced mode, so select > ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64. > > CC: Catalin Marinas <catalin.marinas@arm.com> > CC: Will Deacon <will.deacon@arm.com> > Reviewed-by: Grant Likely <grant.likely@linaro.org> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> > Tested-by: Yijing Wang <wangyijing@huawei.com> > Tested-by: Mark Langsdorf <mlangsdo@redhat.com> > Tested-by: Jon Masters <jcm@redhat.com> > Tested-by: Timur Tabi <timur@codeaurora.org> > Tested-by: Robert Richter <rrichter@cavium.com> > Acked-by: Robert Richter <rrichter@cavium.com> > Signed-off-by: Al Stone <al.stone@linaro.org> > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Acked-by: Grant Likely <grant.likely@linaro.org> > --- > arch/arm64/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 1b8e973..d00ab9a 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -1,5 +1,6 @@ > config ARM64 > def_bool y > + select ACPI_REDUCED_HARDWARE_ONLY if ACPI > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > select ARCH_HAS_GCOV_PROFILE_ALL > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2015年03月07日 01:47, Lorenzo Pieralisi wrote: > On Wed, Feb 25, 2015 at 08:39:58AM +0000, Hanjun Guo wrote: >> From: Al Stone <al.stone@linaro.org> >> >> ACPI reduced hardware mode is disabled by default, but ARM64 >> can only run properly in ACPI hardware reduced mode, so select >> ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64. > > Agreed. This will remove unneeded acpica code. I think though, > you should also check the FADT flag HW_REDUCED_ACPI at boot to > make sure that the tables are HW reduced compliant. I am flagging Agreed, I will add that check on top of this patch set. We explicitly stated that we are using hardware reduced mode on ARM64 in the doc, so, how about print some warning message and go on with the boot if we got the wrong flag HW_REDUCED_ACPI at boot? > this up because I noticed code in core code (not guarded by > ifdef) that checks: > > acpi_gbl_reduced_hardware > > and if it is not set it goes on instantiating fixed HW devices. > > drivers/acpi/scan.c:2567 > > It is just a heads up, I think it is harmless, but one thing is > removing acpica code on ACPI HW reduced only, the other is to make > sure the kernel does not try to use ACPI HW features that acpica > can't support. I agree, need some cleanups for the ACPICA code I think, and this was raised about 1 and half years ago and Intel folks need more consideration on that [1]. [1]: http://comments.gmane.org/gmane.linux.acpi.devel/63844 Thanks Hanjun -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1b8e973..d00ab9a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1,5 +1,6 @@ config ARM64 def_bool y + select ACPI_REDUCED_HARDWARE_ONLY if ACPI select ARCH_BINFMT_ELF_RANDOMIZE_PIE select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_GCOV_PROFILE_ALL