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| author | Yinghai Lu <yinghai@kernel.org> | 2010-02-10 01:20:27 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-12 09:42:39 -0800 |
| commit | 53db62a2529280ff216c941d8a2650204547e44a (patch) | |
| tree | d36dba91fb6a1902aa5c2de70557ad858327ec75 /arch/x86/kernel/early_res.c | |
| parent | efdd0e81df0f23830c6d2cb971cf87f415b8dbdb (diff) | |
| download | lwn-53db62a2529280ff216c941d8a2650204547e44a.tar.gz lwn-53db62a2529280ff216c941d8a2650204547e44a.zip | |
early_res: Enhance check_and_double_early_res
... to make it always try to start from low at first.
This makes it less likely for early_memtest to reserve a bad range, in
particular it puts new early_res in a range that is already tested.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-24-git-send-email-yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/early_res.c')
| -rw-r--r-- | arch/x86/kernel/early_res.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/arch/x86/kernel/early_res.c b/arch/x86/kernel/early_res.c index 1b99a2619f9f..dbf08bd01252 100644 --- a/arch/x86/kernel/early_res.c +++ b/arch/x86/kernel/early_res.c @@ -180,9 +180,9 @@ void __init reserve_early_overlap_ok(u64 start, u64 end, char *name) __reserve_early(start, end, name, 1); } -static void __init __check_and_double_early_res(u64 start) +static void __init __check_and_double_early_res(u64 ex_start, u64 ex_end) { - u64 end, size, mem; + u64 start, end, size, mem; struct early_res *new; /* do we have enough slots left ? */ @@ -190,10 +190,23 @@ static void __init __check_and_double_early_res(u64 start) return; /* double it */ - end = max_pfn_mapped << PAGE_SHIFT; + mem = -1ULL; size = sizeof(struct early_res) * max_early_res * 2; - mem = find_e820_area(start, end, size, sizeof(struct early_res)); - + if (early_res == early_res_x) + start = 0; + else + start = early_res[0].end; + end = ex_start; + if (start + size < end) + mem = find_e820_area(start, end, size, + sizeof(struct early_res)); + if (mem == -1ULL) { + start = ex_end; + end = max_pfn_mapped << PAGE_SHIFT; + if (start + size < end) + mem = find_e820_area(start, end, size, + sizeof(struct early_res)); + } if (mem == -1ULL) panic("can not find more space for early_res array"); @@ -235,7 +248,7 @@ void __init reserve_early(u64 start, u64 end, char *name) if (start >= end) return; - __check_and_double_early_res(end); + __check_and_double_early_res(start, end); drop_overlaps_that_are_ok(start, end); __reserve_early(start, end, name, 0); @@ -248,7 +261,7 @@ void __init reserve_early_without_check(u64 start, u64 end, char *name) if (start >= end) return; - __check_and_double_early_res(end); + __check_and_double_early_res(start, end); r = &early_res[early_res_count]; |