linux-kernel - Re: early crash on ancient tablet related to no-bootmem

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Date:	Fri, 06 May 2011 10:52:22 +0200
From:	Stefan Hellermann <stefan@...2masters.de>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: early crash on ancient tablet related to no-bootmem

Am 06.05.2011 08:30, schrieb Yinghai Lu:
> 
> please check
> 
> [PATCH] mm: Use alloc_bootmem_node_nopanic on really needed path
> 
> Stefan found nobootmem does not work on his system that only have 8M ram.
> 
> It turns out we should ignore the low limit the 16M.
> 
> Use alloc_bootmem_node_nopanic in those calling.
> 
> Reported-by: Stefan Hellermann <stefan@...2masters.de>
> Signed-off-by: Yinghai LU <yinghai@...nel.org>

You found it! bootlog attached.
Tested-by: Stefan Hellermann <stefan@...2masters.de>

> 
> ---
>  include/linux/bootmem.h |    2 ++
>  mm/page_alloc.c         |    6 +++---
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6/include/linux/bootmem.h
> ===================================================================
> --- linux-2.6.orig/include/linux/bootmem.h
> +++ linux-2.6/include/linux/bootmem.h
> @@ -111,6 +111,8 @@ extern void *__alloc_bootmem_low_node(pg
>  	__alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
>  #define alloc_bootmem_node(pgdat, x) \
>  	__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
> +#define alloc_bootmem_node_nopanic(pgdat, x) \
> +	__alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
>  #define alloc_bootmem_pages_node(pgdat, x) \
>  	__alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
>  #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
> Index: linux-2.6/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.orig/mm/page_alloc.c
> +++ linux-2.6/mm/page_alloc.c
> @@ -3564,7 +3564,7 @@ int zone_wait_table_init(struct zone *zo
>  
>  	if (!slab_is_available()) {
>  		zone->wait_table = (wait_queue_head_t *)
> -			alloc_bootmem_node(pgdat, alloc_size);
> +			alloc_bootmem_node_nopanic(pgdat, alloc_size);
>  	} else {
>  		/*
>  		 * This case means that a zone whose size was 0 gets new memory
> @@ -4141,7 +4141,7 @@ static void __init setup_usemap(struct p
>  	unsigned long usemapsize = usemap_size(zonesize);
>  	zone->pageblock_flags = NULL;
>  	if (usemapsize)
> -		zone->pageblock_flags = alloc_bootmem_node(pgdat, usemapsize);
> +		zone->pageblock_flags = alloc_bootmem_node_nopanic(pgdat, usemapsize);
>  }
>  #else
>  static inline void setup_usemap(struct pglist_data *pgdat,
> @@ -4307,7 +4307,7 @@ static void __init_refok alloc_node_mem_
>  		size =  (end - start) * sizeof(struct page);
>  		map = alloc_remap(pgdat->node_id, size);
>  		if (!map)
> -			map = alloc_bootmem_node(pgdat, size);
> +			map = alloc_bootmem_node_nopanic(pgdat, size);
>  		pgdat->node_mem_map = map + (pgdat->node_start_pfn - start);
>  	}
>  #ifndef CONFIG_NEED_MULTIPLE_NODES


View attachment "bootlog.txt" of type "text/plain" (4980 bytes)