On 11/20/2015 10:36 AM, Stefano Stabellini wrote: > On Fri, 20 Nov 2015, Boris Ostrovsky wrote: >> On 11/20/2015 06:24 AM, Stefano Stabellini wrote: >>> On Wed, 18 Nov 2015, Boris Ostrovsky wrote: >>>> After commit 8c058b0b9c34 ("x86/irq: Probe for PIC presence before >>>> allocating descs for legacy IRQs") early_irq_init() will no longer >>>> preallocate descriptors for legacy interrupts if PIC does not >>>> exist, which is the case for Xen PV guests. >>>> >>>> Therefore we may need to allocate those descriptors ourselves. >>>> >>>> Signed-off-by: Boris Ostrovsky >>>> Suggested-by: Thomas Gleixner >>> You need to do this for arm64 too. >>> >>> FYI you can download arm64 cross-compilers from >>> https://releases.linaro.org/14.04/components/toolchain/binaries/ >>> then you can use them by exporting ARCH=arm64 and >>> CROSS_COMPILE=/path/to/gcc-linaro-aarch64-linux-gnu-version/bin/aarch64-linux-gnu- >> I did test on arm but didn't realize that arm64 uses different include files. >> >> Does arm64 not have any legacy interrupts? >> >> BTW, I got this build error: >> >> STUBCPY drivers/firmware/efi/libstub/lib-sort.stub.o >> 0000000000000000 R_AARCH64_ABS64 __efistub_sort >> 0000000000000008 R_AARCH64_ABS64 .init__ksymtab_strings >> drivers/firmware/efi/libstub/lib-sort.stub.o: absolute symbol references not >> allowed in the EFI stub >> drivers/firmware/efi/libstub/Makefile:63: recipe for target >> 'drivers/firmware/efi/libstub/lib-sort.stub.o' failed >> make[4]: *** [drivers/firmware/efi/libstub/lib-sort.stub.o] Error 1 >> scripts/Makefile.build:403: recipe for target 'drivers/firmware/efi/libstub' >> failed >> make[3]: *** [drivers/firmware/efi/libstub] Error 2 >> scripts/Makefile.build:403: recipe for target 'drivers/firmware/efi' failed >> make[2]: *** [drivers/firmware/efi] Error 2 >> scripts/Makefile.build:403: recipe for target 'drivers/firmware' failed >> make[1]: *** [drivers/firmware] Error 2 >> Makefile:943: recipe for target 'drivers' failed >> make: *** [drivers] Error 2 >> >> I worked around this by removing some of EFI config options but presumably >> this needs to be properly fixed. > Interesting. This build error could be something new. Could you please > post your kernel config? Attached. This, BTW, is on a relatively old toolstack: gcc version 4.8.2 20131014 (prerelease) (crosstool-NG linaro-1.13.1-4.8-2013.10 - Linaro GCC 2013.10) -boris