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efi_loader: Keep memory mapping sorted when splitting an entry

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The code assumes sorted mappings in descending address order. When
splitting a mapping, insert the new part next to the current mapping.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Stefan Brüns 2016-10-01 23:32:28 +02:00 • committed by Alexander Graf
parent b61d857b2f
commit b6a9517275
1 changed files with 2 additions and 1 deletions
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lib/efi_loader/efi_memory.c
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@ -135,7 +135,8 @@ static int efi_mem_carve_out(struct efi_mem_list *map,
newmap->desc = map->desc;
newmap->desc.physical_start = carve_start;
newmap->desc.num_pages = (map_end - carve_start) >> EFI_PAGE_SHIFT;
list_add_tail(&newmap->link, &efi_mem);
/* Insert before current entry (descending address order) */
list_add_tail(&newmap->link, &map->link);
/* Shrink the map to [ map_start ... carve_start ] */
map_desc->num_pages = (carve_start - map_start) >> EFI_PAGE_SHIFT;