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Re: [Xen-devel] [PATCH 2/8] arch/x86/xen/irq: Cleanup code/data sections

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/8] arch/x86/xen/irq: Cleanup code/data sections definitions
From: Daniel Kiper <dkiper@xxxxxxxxxxxx>
Date: Mon, 9 May 2011 14:24:41 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Daniel Kiper <dkiper@xxxxxxxxxxxx>, konrad.wilk@xxxxxxxxxx
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On Thu, May 05, 2011 at 08:31:46AM +0100, Jan Beulich wrote:
> >>> On 04.05.11 at 20:16, Daniel Kiper <dkiper@xxxxxxxxxxxx> wrote:
> > Cleanup code/data sections definitions
> > accordingly to include/linux/init.h.
> I'm not clear what the motivation for this patch series is in the first
> place, but I'm particularly unhappy with following inconsistent

The main reason was introduction of git commit 
(xen/mmu: Add workaround "x86-64, mm: Put early page table high") which
revealed section conflict in arch/x86/xen/mmu.c. Section for
static const struct pv_mmu_ops xen_mmu_ops was set incorrectly to
__initdata. When

static __initdata u64 __last_pgt_set_rw = 0;

was added then it conflicted with xen_mmu_ops definition.
After some investigation I found that Xen kernel code contains
more those type of sections mismatches (const data moved to
__initdata) and inconsistency with include/linux/init.h.
That is why I thought it is worth to clean up that problems.

It should be mentioned that git commit a38647837a411f7df79623128421eef2118b5884
will be removed from next rc, however, it does not invalidate my cleanup

> guidelines: The placement suggestion for function and data
> definitions are not in sync - the annotation is said to go between
> type and name for functions, but after the name for data, yet
> there's no reason known to me why the rule for data can't be the
> same as that for functions (the other way around doesn't work,
> as gcc's documentation says that for function definitions (other
> than for their declarations) attributes cannot currently follow the
> declarator.
> So I'd rather think the guidelines should first be made consistent
> (or it should be explained why they must be different), and then
> the users of those annotations should get updated.

I looked for any explanation, however, I did not find anything strong.
Probably it was done to be in sync with GCC documentation (despite that
__attribute__ in variable definition could be used virtually anywhere).
Please look into:



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