Will, On Fri, Jul 13, 2018 at 07:49:45AM +0200, Ard Biesheuvel wrote: > On 13 July 2018 at 02:34, AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx> wrote: > > On Thu, Jul 12, 2018 at 05:49:19PM +0100, Will Deacon wrote: > >> Hi Akashi, > >> > >> On Tue, Jul 10, 2018 at 08:42:25AM +0900, AKASHI Takahiro wrote: > >> > This patch series is a set of bug fixes to address kexec/kdump > >> > failures which are sometimes observed on ACPI-only system and reported > >> > in LAK-ML before. > >> > >> I tried picking this up, along with Ard's fixup, but I'm seeing a build > >> failure for allmodconfig: > >> > >> arch/arm64/kernel/acpi.o: In function `__acpi_get_mem_attribute': > >> acpi.c:(.text+0x60): undefined reference to `efi_mem_attributes' > >> > >> I didn't investigate further. Please can you fix this? > > > > Because CONFIG_ACPI is on and CONFIG_EFI is off. > > > > This can happen in allmodconfig as CONFIG_EFI depends on > > !CONFIG_CPU_BIG_ENDIAN, which is actually on in this case. > > > > Allowing both CONFIG_ACPI and CONFIG_CPU_BIG_ENDIAN to be configured > makes no sense at all. Things will surely break if you start using BE > memory accesses while parsing ACPI tables. > > Allowing CONFIG_ACPI without CONFIG_EFI makes no sense either, since > on arm64, the only way to find the ACPI tables is through a UEFI > configuration table. Do you agree to this? -Takahiro AKASHI > > Looking at __acpi_get_mem_attributes(), since there is no information > > available on memory attributes, what we can do at best is > > * return PAGE_KERNEL (= cacheable) for mapped memory, > > * return DEVICE_nGnRnE (= non-cacheable) otherwise > > (See a hunk to be applied on top of my patch#4.) > > > > I think that, after applying, acpi_os_ioremap() would work almost > > in the same way as the original before my patchset given that > > MAP memblock attribute is used only under CONFIG_EFI for now. > > > > Make sense? > > > > Let's keep your code as is but fix the Kconfig dependencies instead. _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
