[RFT/RFC PATCH 6/6] ARM: keep .text and .fixup regions together
arnd at arndb.de
Fri Mar 13 04:18:34 PDT 2015
On Thursday 12 March 2015 21:22:02 Russell King - ARM Linux wrote:
> On Thu, Mar 12, 2015 at 10:18:26PM +0100, Ard Biesheuvel wrote:
> > >> Note that the TEXT_TEXT macro will emit *(.text) again but this should be
> > >> harmless.
> > >
> > > However, I wonder if by doing this, we're weakening the ability for
> > > kallsyms final link to succeed:
> > >
> > > /* .text section. Map to function alignment to avoid address changes
> > > * during second ld run in second ld pass when generating System.map */
> > >
> > > Can we not just move .fixup before TEXT_TEXT? The only thing between it
> > > and .text would be .text.hot.
> > >
> > Putting .fixup before .text already helps, but not enough for the
> > .config Arnd gave me that I have been testing this with.
> > What *(.text .fixup) does (i.e., putting both section names inside the
> > parentheses), is emitting both sections for each input object file, so
> > they will always be close to the object that it refers to, so it is
> > not the same thing.
> I'll suggest a different solution then - how about modifying
> asm-generic/vmlinux.lds.h to change *(.text) to *(.text .text.fixup)
> and we move all the .fixup sections to .text.fixup ? Arnd?
No objections from me, but I really don't know enough about the possible
side-effects this may have on the other architectures, so we need to
run this by the linux-arch mailing list.
More information about the linux-arm-kernel