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Subject[PATCH 07/35] x86, lmb: Add lmb_to_bootmem()
Date
lmb_to_bootmem() will reserve lmb.reserved.region in bootmem after bootmem is
set up.

We can use it to with all arches that support lmb later.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/include/asm/lmb.h | 1 +
arch/x86/mm/lmb.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/lmb.h b/arch/x86/include/asm/lmb.h
index aa3a66e..2f06714 100644
--- a/arch/x86/include/asm/lmb.h
+++ b/arch/x86/include/asm/lmb.h
@@ -4,5 +4,6 @@
#define ARCH_DISCARD_LMB

u64 lmb_find_area_size(u64 start, u64 *sizep, u64 align);
+void lmb_to_bootmem(u64 start, u64 end);

#endif
diff --git a/arch/x86/mm/lmb.c b/arch/x86/mm/lmb.c
index 9d26eed..37a05e2 100644
--- a/arch/x86/mm/lmb.c
+++ b/arch/x86/mm/lmb.c
@@ -86,3 +86,34 @@ u64 __init lmb_find_area_size(u64 start, u64 *sizep, u64 align)
return LMB_ERROR;
}

+#ifndef CONFIG_NO_BOOTMEM
+void __init lmb_to_bootmem(u64 start, u64 end)
+{
+ int i, count;
+ u64 final_start, final_end;
+
+ /* Take out region array itself */
+ if (lmb.reserved.regions != lmb_reserved_init_regions)
+ lmb_free(__pa(lmb.reserved.regions), sizeof(struct lmb_region) * lmb.reserved.max);
+
+ count = lmb.reserved.cnt;
+ pr_info("(%d early reservations) ==> bootmem [%010llx - %010llx]\n", count, start, end);
+ for (i = 0; i < count; i++) {
+ struct lmb_region *r = &lmb.reserved.regions[i];
+ pr_info(" #%d [%010llx - %010llx] ", i, (u64)r->base, (u64)r->base + r->size);
+ final_start = max(start, r->base);
+ final_end = min(end, r->base + r->size);
+ if (final_start >= final_end) {
+ pr_cont("\n");
+ continue;
+ }
+ pr_cont(" ==> [%010llx - %010llx]\n", final_start, final_end);
+ reserve_bootmem_generic(final_start, final_end - final_start, BOOTMEM_DEFAULT);
+ }
+ /* Clear them to avoid misusing ? */
+ memset(&lmb.reserved.regions[0], 0, sizeof(struct lmb_region) * lmb.reserved.max);
+ lmb.reserved.regions = NULL;
+ lmb.reserved.max = 0;
+ lmb.reserved.cnt = 0;
+}
+#endif
--
1.6.4.2


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