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lmb: Treat a region which is a subset as equal

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In various cases logical memory blocks are coalesced; As a result doing
a strict check whether memory blocks are the same doesn't necessarily
work as a previous addition of a given block might have been merged into
a bigger block.

Fix this by considering a block is already registered if it's a pure
subset of one of the existing blocks.

Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
This commit is contained in:
Sjoerd Simons 2023-02-12 16:07:05 +01:00 committed by Tom Rini
parent 78d1c3949a
commit 0d91c88230
1 changed files with 3 additions and 1 deletions
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4
lib/lmb.c
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@ -247,8 +247,10 @@ static long lmb_add_region_flags(struct lmb_region *rgn, phys_addr_t base,
phys_addr_t rgnbase = rgn->region[i].base;
phys_size_t rgnsize = rgn->region[i].size;
phys_size_t rgnflags = rgn->region[i].flags;
phys_addr_t end = base + size - 1;
phys_addr_t rgnend = rgnbase + rgnsize - 1;
if (rgnbase == base && rgnsize == size) {
if (rgnbase <= base && end <= rgnend) {
if (flags == rgnflags)
/* Already have this region, so we're done */
return 0;