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authorJohannes Weiner <hannes@saeurebad.de>2008-07-23 21:28:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:20 -0700
commitd747fa4bcebcf3696607b86a6b0dafa644be0676 (patch)
treeca6efae6f21cc357b75ecf2c91344d79ac465645
parent5f2809e69c7128f86316048221cf45146f69a4a0 (diff)
downloadop-kernel-dev-d747fa4bcebcf3696607b86a6b0dafa644be0676.zip
op-kernel-dev-d747fa4bcebcf3696607b86a6b0dafa644be0676.tar.gz
bootmem: free/reserve helpers
Factor out the common operation of marking a range on the bitmap. [akpm@linux-foundation.org: fix various warnings] Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/bootmem.c65
1 files changed, 43 insertions, 22 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 94ea612..9d03ff6 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -225,6 +225,44 @@ unsigned long __init free_all_bootmem(void)
return free_all_bootmem_core(NODE_DATA(0)->bdata);
}
+static void __init __free(bootmem_data_t *bdata,
+ unsigned long sidx, unsigned long eidx)
+{
+ unsigned long idx;
+
+ bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
+ sidx + PFN_DOWN(bdata->node_boot_start),
+ eidx + PFN_DOWN(bdata->node_boot_start));
+
+ for (idx = sidx; idx < eidx; idx++)
+ if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
+ BUG();
+}
+
+static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
+ unsigned long eidx, int flags)
+{
+ unsigned long idx;
+ int exclusive = flags & BOOTMEM_EXCLUSIVE;
+
+ bdebug("nid=%td start=%lx end=%lx flags=%x\n",
+ bdata - bootmem_node_data,
+ sidx + PFN_DOWN(bdata->node_boot_start),
+ eidx + PFN_DOWN(bdata->node_boot_start),
+ flags);
+
+ for (idx = sidx; idx < eidx; idx++)
+ if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
+ if (exclusive) {
+ __free(bdata, sidx, idx);
+ return -EBUSY;
+ }
+ bdebug("silent double reserve of PFN %lx\n",
+ idx + PFN_DOWN(bdata->node_boot_start));
+ }
+ return 0;
+}
+
static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
unsigned long size)
{
@@ -258,14 +296,7 @@ static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
- bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
- sidx + PFN_DOWN(bdata->node_boot_start),
- eidx + PFN_DOWN(bdata->node_boot_start));
-
- for (i = sidx; i < eidx; i++) {
- if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map)))
- BUG();
- }
+ __free(bdata, sidx, eidx);
}
/**
@@ -367,16 +398,7 @@ static void __init reserve_bootmem_core(bootmem_data_t *bdata,
if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
- bdebug("nid=%td start=%lx end=%lx flags=%x\n",
- bdata - bootmem_node_data,
- sidx + PFN_DOWN(bdata->node_boot_start),
- eidx + PFN_DOWN(bdata->node_boot_start),
- flags);
-
- for (i = sidx; i < eidx; i++)
- if (test_and_set_bit(i, bdata->node_bootmem_map))
- bdebug("hm, page %lx reserved twice.\n",
- PFN_DOWN(bdata->node_boot_start) + i);
+ return __reserve(bdata, sidx, eidx, flags);
}
/**
@@ -511,10 +533,9 @@ find_block:
/*
* Reserve the area now:
*/
- for (i = PFN_DOWN(start_off) + merge;
- i < PFN_UP(end_off); i++)
- if (test_and_set_bit(i, bdata->node_bootmem_map))
- BUG();
+ if (__reserve(bdata, PFN_DOWN(start_off) + merge,
+ PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
+ BUG();
region = phys_to_virt(bdata->node_boot_start + start_off);
memset(region, 0, size);
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