On 12/17/18 7:16 PM, tip-bot for Heinrich Schuchardt wrote: > Commit-ID: 793423cf07e51e3185b8680167115813589c057d > Gitweb: https://git.kernel.org/tip/793423cf07e51e3185b8680167115813589c057d > Author: Heinrich Schuchardt <xypron.glpk@xxxxxx> > AuthorDate: Mon, 17 Dec 2018 19:02:14 +0100 > Committer: Ingo Molnar <mingo@xxxxxxxxxx> > CommitDate: Mon, 17 Dec 2018 19:12:48 +0100 > > efi: Align 'efi_guid_t' to 64 bits > > The UEFI Specification Version 2.7 Errata A defines: > > "EFI_GUID > 128-bit buffer containing a unique identifier value. > Unless otherwise specified, aligned on a 64-bit boundary." > > Before this patch efi_guid_t was only 8-bit aligned. > > Note that this could potentially trigger alignment faults during > EFI runtime services calls on 32-bit ARM, given that it does not > permit load/store double or load/store multiple instructions to > operate on memory addresses that are not 32-bit aligned. > > Signed-off-by: Heinrich Schuchardt <xypron.glpk@xxxxxx> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> # v4.9+, or earlier if possible > Cc: Andy Lutomirski <luto@xxxxxxxxxx> > Cc: Borislav Petkov <bp@xxxxxxxxx> > Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > Cc: H. Peter Anvin <hpa@xxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Qian Cai <cai@xxxxxx> > Cc: Rik van Riel <riel@xxxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: linux-efi@xxxxxxxxxxxxxxx > Link: http://lkml.kernel.org/r/20181217180214.9436-3-ard.biesheuvel@xxxxxxxxxx > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> > --- > include/linux/efi.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/efi.h b/include/linux/efi.h > index 100ce4a4aff6..e6480c805932 100644 > --- a/include/linux/efi.h > +++ b/include/linux/efi.h > @@ -48,7 +48,7 @@ typedef u16 efi_char16_t; /* UNICODE character */ > typedef u64 efi_physical_addr_t; > typedef void *efi_handle_t; > > -typedef guid_t efi_guid_t; > + > > #define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \ > GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) > Before rushing this patch in, we should carefully review its side effects, e.g. on 32bit system this changes the size of efi_config_table_32_t from 20 to 24, which is part of the interface to the UEFI firmware. Best regards Heinrich
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