On Mon, 08 Sep, at 01:01:08PM, Mark Salter wrote: > Commit 86c8b27a01cf: > "arm64: ignore DT memreserve entries when booting in UEFI mode > > prevents early_init_fdt_scan_reserved_mem() from being called for > arm64 kernels booting via UEFI. This was done because the kernel > will use the UEFI memory map to determine reserved memory regions. > That approach has problems in that early_init_fdt_scan_reserved_mem() > also reserves the FDT itself and any node-specific reserved memory. > By chance of some kernel configs, the FDT may be overwritten before > it can be unflattened and the kernel will fail to boot. More subtle > problems will result if the FDT has node specific reserved memory > which is not really reserved. > > This patch has the UEFI stub remove the memory reserve map entries > from the FDT as it does with the memory nodes. This allows > early_init_fdt_scan_reserved_mem() to be called unconditionally > so that the other needed reservations are made. > > Change from v1: > * Acks added > * Fixed loop logic to remove reserved regions > > Signed-off-by: Mark Salter <msalter@xxxxxxxxxx> > Acked-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > Acked-by: Mark Rutland <mark.rutland@xxxxxxx> > --- > arch/arm64/mm/init.c | 3 +-- > drivers/firmware/efi/libstub/fdt.c | 10 +++++++++- > 2 files changed, 10 insertions(+), 3 deletions(-) Thanks Mark, queued up in 'urgent'. -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
