The patch titled
mm: use alloc_bootmem_node_nopanic() on really needed path
has been removed from the -mm tree. Its filename was
mm-use-alloc_bootmem_node_nopanic-on-really-needed-path.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: use alloc_bootmem_node_nopanic() on really needed path
From: Yinghai Lu <yinghai@xxxxxxxxxx>
Stefan found nobootmem does not work on his system that has only 8M of
RAM. This causes an early panic:
(Red Hat 4.6.0-6) (GCC) ) #5 Thu May 5 21:49:09 CEST 2011
BIOS-provided physical RAM map:
BIOS-88: 0000000000000000 - 000000000009f000 (usable)
BIOS-88: 0000000000100000 - 0000000000840000 (usable)
bootconsole [earlyser0] enabled
Notice: NX (Execute Disable) protection missing in CPU or disabled in BIOS!
DMI not present or invalid.
last_pfn = 0x840 max_arch_pfn = 0x100000
init_memory_mapping: 0000000000000000-0000000000840000
8MB LOWMEM available.
mapped low ram: 0 - 00840000
low ram: 0 - 00840000
Zone PFN ranges:
DMA 0x00000001 -> 0x00001000
Normal empty
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
0: 0x00000001 -> 0x0000009f
0: 0x00000100 -> 0x00000840
BUG: Int 6: CR2 (null)
EDI c034663c ESI (null) EBP c0329f38 ESP c0329ef4
EBX c0346380 EDX 00000006 ECX ffffffff EAX fffffff4
err (null) EIP c0353191 CS c0320060 flg 00010082
Stack: (null) c030c533 000007cd (null) c030c533 00000001 (null) (null)
00000003 0000083f 00000018 00000002 00000002 c0329f6c c03534d6 (null)
(null) 00000100 00000840 (null) c0329f64 00000001 00001000 (null)
Pid: 0, comm: swapper Not tainted 2.6.36 #5
Call Trace:
[<c02e3707>] ? 0xc02e3707
[<c035e6e5>] 0xc035e6e5
[<c0353191>] ? 0xc0353191
[<c03534d6>] 0xc03534d6
[<c034f1cd>] 0xc034f1cd
[<c034a824>] 0xc034a824
[<c03513cb>] ? 0xc03513cb
[<c0349432>] 0xc0349432
[<c0349066>] 0xc0349066
It turns out that we should ignore the low limit of 16M.
Use alloc_bootmem_node_nopanic() in this case.
[akpm@xxxxxxxxxxxxxxxxxxxx: less mess]
Signed-off-by: Yinghai LU <yinghai@xxxxxxxxxx>
Reported-by: Stefan Hellermann <stefan@xxxxxxxxxxxxxx>
Tested-by: Stefan Hellermann <stefan@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx> [2.6.34+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/bootmem.h | 2 ++
mm/page_alloc.c | 7 ++++---
2 files changed, 6 insertions(+), 3 deletions(-)
diff -puN include/linux/bootmem.h~mm-use-alloc_bootmem_node_nopanic-on-really-needed-path include/linux/bootmem.h
--- a/include/linux/bootmem.h~mm-use-alloc_bootmem_node_nopanic-on-really-needed-path
+++ a/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) \
diff -puN mm/page_alloc.c~mm-use-alloc_bootmem_node_nopanic-on-really-needed-path mm/page_alloc.c
--- a/mm/page_alloc.c~mm-use-alloc_bootmem_node_nopanic-on-really-needed-path
+++ a/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 +4141,8 @@ 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 +4308,7 @@ 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
_
Patches currently in -mm which might be from yinghai@xxxxxxxxxx are
origin.patch
linux-next.patch
pci-dmar-update-dmar-units-devices-list-during-hotplug.patch
memblock-nobootmem-allow-alloc_bootmem-to-take-0-as-low-limit.patch
memblock-nobootmem-remove-code-for-alloc_bootmem_node_high.patch
memblock-add-error-return-when-config_have_memblock-is-not-set.patch
memblock-add-input-size-checking-to-memblock_find_region.patch
memblock-add-input-size-checking-to-memblock_find_region-fix.patch
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