On 10 February 2017 at 00:40, Ruigrok, Richard <rruigrok@xxxxxxxxxxxxxx> wrote: > > > On 2/9/2017 2:42 PM, Ard Biesheuvel wrote: > > The FDT is mapped via a fixmap entry that is at least 2 MB in size and > 2 MB aligned on 4 KB page size kernels. > > On UEFI systems, the FDT allocation may share this 2 MB block with a > reserved region, or another memory region that we should never map, > unless we account for this in the size of the allocation (the alignment > is already 2 MB) > > So instead of taking guesses at the needed space, simply allocate 2 MB > immediately. The allocation will be recorded as a EFI_LOADER_DATA, and > the kernel only memblock_reserve()'s the actual size of the FDT, so the > unused space will be released to the kernel. > > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > --- > arch/arm64/include/asm/efi.h | 1 + > drivers/firmware/efi/libstub/fdt.c | 57 +++++++++----------- > 2 files changed, 25 insertions(+), 33 deletions(-) > [..] > Tested successfully on our QDT2400 system on which we were seeing a failure > to allocate memory for initrd. > > Tested-by: Richard Ruigrok <rruigrok@xxxxxxxxxxxxxx> > Thanks -- 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
