Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area



To initialize the percpu data you do want to talk to the virtual address
at __per_coup_load. But it is absolute Ugh.
It might be worth saying something like.
.data.percpu.start : AT(.data.percpu.dummy - LOAD_OFFSET) {
DATA(0) . = ALIGN(align);
__per_cpu_load = . ; }
To make __per_cpu_load a relative symbol. ld has a bad habit of taking
symbols out of empty sections and making them absolute. Which is why
I added the DATA(0).

The syntax error is at this "DATA(0)" statement. I don't find this as a
linker script command or a macro. What is it we're trying to do with this?

Thanks,
Mike
...
I'm not sure I understand the linker lingo enough to fill in the rest
of the blanks... I've tried various versions around this framework and
none have been accepted yet.

#ifdef CONFIG_HAVE_ZERO_BASED_PER_CPU
#define PERCPU(align) \
.data.percpu.start : AT(.data.percpu.dummy - LOAD_OFFSET) { \
DATA(0) \
. = ALIGN(align); \
__per_cpu_load = .; \
*(.data.percpu.first) \
*(.data.percpu.shared_aligned) \
*(.data.percpu) \
*(.data.percpu.page_aligned) \
____per_cpu_size = . - __per_cpu_load \
} \
#else
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