efi/arm-stub: Round up FDT allocation to mapping size
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 mapping 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 EFI_LOADER_DATA, and the kernel only memblock_reserve()'s the actual size of the FDT, so the unused space will be released back to the kernel. Reviewed-By: NJeffrey Hugo <jhugo@codeaurora.org> Tested-by: NRichard Ruigrok <rruigrok@codeaurora.org> Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170404160245.27812-6-ard.biesheuvel@linaro.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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