Jens, any comments on this patch?
Thanks, Malahal.
Malahal Naineni [malahal@xxxxxxxxxx] wrote:
> The bounce_pfn of the request queue in 64 bit systems is set to the
> current max_low_pfn. Adding more memory later makes this incorrect.
> Memory allocated beyond this boot time max_low_pfn appear to require
> bounce buffers (bounce buffers are actually not allocated but used in
> calculating segments that may result in "over max segments limit"
> errors).
>
> Signed-off-by: Malahal Naineni (malahal@xxxxxxxxxx)
>
> diff -r 09daf852c1c5 -r c9516154fabc block/blk-settings.c
> --- a/block/blk-settings.c Thu Sep 09 12:10:43 2010 -0700
> +++ b/block/blk-settings.c Mon Sep 13 10:15:24 2010 -0700
> @@ -214,16 +214,14 @@ void blk_queue_bounce_limit(struct reque
> */
> if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
> dma = 1;
> - q->limits.bounce_pfn = max_low_pfn;
> #else
> if (b_pfn < blk_max_low_pfn)
> dma = 1;
> +#endif
> q->limits.bounce_pfn = b_pfn;
> -#endif
> if (dma) {
> init_emergency_isa_pool();
> q->limits.bounce_gfp = GFP_NOIO | GFP_DMA;
> - q->limits.bounce_pfn = b_pfn;
> }
> }
> EXPORT_SYMBOL(blk_queue_bounce_limit);
> --
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