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SubjectRe: [PATCH] Use separate sections for __dev/__cpu/__mem code/data
On Mon, Jan 21, 2008 at 04:33:41PM +0900, Paul Mundt wrote:
> On Sun, Jan 20, 2008 at 09:09:03PM +0100, Sam Ravnborg wrote:
> > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> > index ded7ca2..e0a56fb 100644
> > --- a/include/asm-generic/vmlinux.lds.h
> > +++ b/include/asm-generic/vmlinux.lds.h
> > @@ -9,10 +9,46 @@
> > /* Align . to a 8 byte boundary equals to maximum function alignment. */
> > #define ALIGN_FUNCTION() . = ALIGN(8)
> >
> > +/* The actual configuration determine if the init/exit sections
> > + * are handled as text/data or they can be discarded (which
> > + * often happens at runtime)
> > + */
> > +#ifdef CONFIG_HOTPLUG
> > +#define DEV_KEEP(sec) *(.dev##sec)
> > +#define DEV_DISCARD(sec)
> > +#else
> > +#define DEV_KEEP(sec)
> > +#define DEV_DISCARD(sec) *(.dev##sec)
> > +#endif
> > +
> Using your kbuild.git, these blow up for me:
>
> LD .tmp_vmlinux1
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:364: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:364: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:364: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:364: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:381: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:381: ignoring invalid character `#' in script
> sh4-linux-ld:arch/sh/kernel/vmlinux.lds:381: ignoring invalid character `#' in script
> ...
>
> This comes out as:
>
> .text : {
> *(.text.head)
> . = ALIGN(8); *(.text) *(.text.init.refok) *(.exit.text.refok) *(.dev##init.text)
> *(.dev##exit.text)
>
> . = ALIGN(8); __sched_text_start = .; *(.sched.text)
> __sched_text_end = .;
> . = ALIGN(8); __lock_text_start = .; *(.spinlock.text)
> __lock_text_end = .;
> . = ALIGN(8); __kprobes_text_start = .; *(.kprobes.text)
> __kprobes_text_end = .;
> *(.fixup)
> *(.gnu.warning)
> ...
>
> so the ## is being taken directly rather than acting as a concatenation.

Strange...
I can reproduce with gcc 3.4.5 here - will fix.

Setting CONFIG_HOTPLUG=n for sparc64 also cause troubles. Something with local symbols discarded.
So more work is needed.

Sam


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