Hi David,
On Fri, May 17, 2013 at 07:33:53PM +0100, David Daney wrote:
> On 05/17/2013 09:43 AM, Will Deacon wrote:
> > As is done for other architectures, sort the exception table at
> > build-time rather than during boot.
> >
> > Since sortextable appears to be a standalone C program relying on the
> > host elf.h to provide EM_AARCH64, I've had to add a conditional check in
> > order to allow cross-compilation on machines that aren't running a
> > bleeding-edge libc-dev.
> >
> > Signed-off-by: Will Deacon <will.dea...@arm.com>
> > ---
> > arch/arm64/Kconfig | 1 +
> > arch/arm64/kernel/vmlinux.lds.S | 15 +++++++--------
> > scripts/sortextable.c | 5 +++++
> > 3 files changed, 13 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index 48347dc..fb8fd90 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -7,6 +7,7 @@ config ARM64
> > select ARM_AMBA
> > select ARM_ARCH_TIMER
> > select ARM_GIC
> > + select BUILDTIME_EXTABLE_SORT
> > select CLONE_BACKWARDS
> > select COMMON_CLK
> > select GENERIC_CLOCKEVENTS
> > diff --git a/arch/arm64/kernel/vmlinux.lds.S
> > b/arch/arm64/kernel/vmlinux.lds.S
> > index 3fae2be..3d527726 100644
> > --- a/arch/arm64/kernel/vmlinux.lds.S
> > +++ b/arch/arm64/kernel/vmlinux.lds.S
> > @@ -57,6 +57,13 @@ SECTIONS
> >
> > RO_DATA(PAGE_SIZE)
> >
> > + . = ALIGN(8);
> > + __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
> > + __start___ex_table = .;
> > + *(__ex_table)
> > + __stop___ex_table = .;
> > + }
> > +
> > _etext = .; /* End of text and rodata section */
>
>
> You have moved this to rodata.
I don't think I have moved this to rodata. The RO_DATA macro expands to a
bunch of sections, but it doesn't leave any of them open at the end.
> o Will the runtime sort still work like this?
>
> o Do we care? Maybe not.
For arm64 we'd be moving exclusively to build-time sorting, so I guess we
*could* stick the thing in rodata if we wanted to. Not sure it's worth the
linker script munging though.
Will
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