linux-kernel - Re: [PATCH 28/31] memblock: Export MEMBLOCK

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Date:	Wed, 28 Jul 2010 15:15:28 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 28/31] memblock: Export MEMBLOCK_ERROR again

On Thu, 2010-07-22 at 11:21 -0700, Yinghai Lu wrote:
> will used by x86 memblock_x86_find_in_range_node and nobootmem replacement
> 
> -v2: use 0 instead -1ULL, Suggested by Linus, so we don't need cast them later to unsigned long

The patch in its current form is a NAK.

You can't just do those two things in one commit.

If we're going to switch LMB errors to always be 0, we need to ensure we
cannot realistically hand out 0 as a result of lmb_alloc().

I'll cook up a patch to do that.

Ben.

> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  include/linux/memblock.h |    1 +
>  mm/memblock.c            |    2 --
>  2 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 70bc467..89749c4 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -19,6 +19,7 @@
>  #include <asm/memblock.h>
>  
>  #define INIT_MEMBLOCK_REGIONS 128
> +#define MEMBLOCK_ERROR		0
>  
>  struct memblock_region {
>  	phys_addr_t base;
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 796ef8c..3d0a754 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -27,8 +27,6 @@ int memblock_can_resize;
>  static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1];
>  struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1];
>  
> -#define MEMBLOCK_ERROR	(~(phys_addr_t)0)
> -
>  /* inline so we don't get a warning when pr_debug is compiled out */
>  static inline const char *memblock_type_name(struct memblock_type *type)
>  {


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