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early_res: Add free_early_partial()

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To free partial areas in pcpu_setup...

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <4B85E245.5030001@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2010-02-24 18:36:53 -08:00
committed by Ingo Molnar
parent 2ee78f7b1d
commit fb90ef93df
4 changed files with 62 additions and 3 deletions
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55
kernel/early_res.c
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@@ -61,6 +61,40 @@ static void __init drop_range(int i)
early_res_count--;
}
static void __init drop_range_partial(int i, u64 start, u64 end)
{
u64 common_start, common_end;
u64 old_start, old_end;
old_start = early_res[i].start;
old_end = early_res[i].end;
common_start = max(old_start, start);
common_end = min(old_end, end);
/* no overlap ? */
if (common_start >= common_end)
return;
if (old_start < common_start) {
/* make head segment */
early_res[i].end = common_start;
if (old_end > common_end) {
/* add another for left over on tail */
reserve_early_without_check(common_end, old_end,
early_res[i].name);
}
return;
} else {
if (old_end > common_end) {
/* reuse the entry for tail left */
early_res[i].start = common_end;
return;
}
/* all covered */
drop_range(i);
}
}
/*
* Split any existing ranges that:
* 1) are marked 'overlap_ok', and
@@ -284,6 +318,27 @@ void __init free_early(u64 start, u64 end)
drop_range(i);
}
void __init free_early_partial(u64 start, u64 end)
{
struct early_res *r;
int i;
try_next:
i = find_overlapped_early(start, end);
if (i >= max_early_res)
return;
r = &early_res[i];
/* hole ? */
if (r->end >= end && r->start <= start) {
drop_range_partial(i, start, end);
return;
}
drop_range_partial(i, start, end);
goto try_next;
}
#ifdef CONFIG_NO_BOOTMEM
static void __init subtract_early_res(struct range *range, int az)
{