linux-kernel - Re: [RFC][PATCH 2/4] mm: stack based kmap

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Date:	Mon, 19 Oct 2009 08:38:12 +0530
From:	Raja R Harinath <harinath@...rynot.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org
Subject:  Re: [RFC][PATCH 2/4] mm: stack based kmap_atomic

Hi,

Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:

> @@ -74,7 +76,10 @@ EXPORT_SYMBOL(kmap_atomic);
>  void kunmap_atomic(void *kvaddr, enum km_type type)
>  {
>  	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
> -	unsigned int idx = type + KM_TYPE_NR * smp_processor_id();
> +	unsigned int idx;
> +
> +	type = kmap_atomic_idx_pop();
> +	idx = type + KM_TYPE_NR * smp_processor_id();

Maybe you can avoid the 4/4 patch and preserve clean bisects by renaming
the unused parameter here and elsewhere, and introduce the 'type' local
in this patch.

  void kunmap_atomic(void *kvaddr, enum km_type unused)
  {
    ...
    unsigned int idx, type;
    ...
  }

That way, patch 3/4 will remove a genuinely unused parameter, and thus
remain compile-able.

- Hari

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