The patch titled
mm: fix free_all_bootmem_core alignment check
has been added to the -mm tree. Its filename is
mm-fix-free_all_bootmem_core-alignment-check.patch
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See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
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Subject: mm: fix free_all_bootmem_core alignment check
From: Johannes Weiner <hannes@xxxxxxxxxxxx>
The check for node_boot_start is bogus because we start freeing at the
corresponding pfn. So check if the pfn is properly aligned instead in a more
readable way and adjust the documentation.
Also remove an unneeded accounting variable.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Yinghai Lu <yhlu.kernel@xxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/bootmem.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
diff -puN mm/bootmem.c~mm-fix-free_all_bootmem_core-alignment-check mm/bootmem.c
--- a/mm/bootmem.c~mm-fix-free_all_bootmem_core-alignment-check
+++ a/mm/bootmem.c
@@ -377,7 +377,7 @@ static unsigned long __init free_all_boo
struct page *page;
unsigned long pfn;
bootmem_data_t *bdata = pgdat->bdata;
- unsigned long i, count, total = 0;
+ unsigned long i, count;
unsigned long idx;
unsigned long *map;
int gofast = 0;
@@ -389,10 +389,13 @@ static unsigned long __init free_all_boo
pfn = PFN_DOWN(bdata->node_boot_start);
idx = bdata->node_low_pfn - pfn;
map = bdata->node_bootmem_map;
- /* Check physaddr is O(LOG2(BITS_PER_LONG)) page aligned */
- if (bdata->node_boot_start == 0 ||
- ffs(bdata->node_boot_start) - PAGE_SHIFT > ffs(BITS_PER_LONG))
+ /*
+ * Check if we are aligned to BITS_PER_LONG pages. If so, we might
+ * be able to free page orders of that size at once.
+ */
+ if (!(pfn & (BITS_PER_LONG-1)))
gofast = 1;
+
for (i = 0; i < idx; ) {
unsigned long v = ~map[i / BITS_PER_LONG];
@@ -420,23 +423,19 @@ static unsigned long __init free_all_boo
}
pfn += BITS_PER_LONG;
}
- total += count;
/*
* Now free the allocator bitmap itself, it's not
* needed anymore:
*/
page = virt_to_page(bdata->node_bootmem_map);
- count = 0;
idx = (get_mapsize(bdata) + PAGE_SIZE-1) >> PAGE_SHIFT;
- for (i = 0; i < idx; i++, page++) {
+ for (i = 0; i < idx; i++, page++)
__free_pages_bootmem(page, 0);
- count++;
- }
- total += count;
+ count += i;
bdata->node_bootmem_map = NULL;
- return total;
+ return count;
}
unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxxx are
origin.patch
git-mips.patch
parisc-remove-redundant-display-of-free-swap-space-in-show_mem.patch
git-xtensa.patch
mm-move-bootmem-descriptors-definition-to-a-single-place.patch
mm-fix-free_all_bootmem_core-alignment-check.patch
mm-normalize-internal-argument-passing-of-bootmem-data.patch
mm-unexport-__alloc_bootmem_core.patch
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