On Mon, Aug 07, 2017 at 07:36:01PM +0100, Mark Rutland wrote: > From: Ard Biesheuvel <[email protected]> > > Given that adr_this_cpu already requires a temp register in addition > to the destination register, tweak the instruction sequence so that sp > may be used as well. > > This will simplify switching to per-cpu stacks in subsequent patches. While > this limits the range of adr_this_cpu, to +/-4GiB, we don't currently use > adr_this_cpu in modules, and this is not problematic for the main kernel > image. > > Signed-off-by: Ard Biesheuvel <[email protected]> > [Mark: add more commit text] > Signed-off-by: Mark Rutland <[email protected]> > Cc: Catalin Marinas <[email protected]> > Cc: James Morse <[email protected]> > Cc: Laura Abbott <[email protected]> > Cc: Will Deacon <[email protected]> > --- > arch/arm64/include/asm/assembler.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/assembler.h > b/arch/arm64/include/asm/assembler.h > index 610a420..4775af5 100644 > --- a/arch/arm64/include/asm/assembler.h > +++ b/arch/arm64/include/asm/assembler.h > @@ -235,7 +235,8 @@ > * @tmp: scratch register > */ > .macro adr_this_cpu, dst, sym, tmp > - adr_l \dst, \sym > + adrp \tmp, \sym > + add \dst, \tmp, #:lo12:\sym > mrs \tmp, tpidr_el1 > add \dst, \dst, \tmp > .endm
Nitpick: it may be worth adding an #ifndef MODULE around these macros, together with a comment, just in case. There are other macros in this file like adr_l which are used in modules (crypto). -- Catalin
