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Make slab allocator work on platforms with MAXIMUM_ALIGNOF < sizeof(int).

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Notably, m68k only needs 2-byte alignment. Per report from Christoph Berg.

Discussion: https://www.postgresql.org/message-id/20170517193957.fwntkgi6epuso5l2@msg.df7cb.de
This commit is contained in:
Heikki Linnakangas 2017-05-18 22:22:13 +03:00
parent 3ec76ff1f2
commit 94884e1c27
1 changed files with 3 additions and 3 deletions
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6
src/backend/utils/mmgr/slab.c
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@ -194,9 +194,9 @@ SlabContextCreate(MemoryContext parent,
MAXALIGN(sizeof(SlabChunk)), MAXALIGN(sizeof(SlabChunk)),
"padding calculation in SlabChunk is wrong"); "padding calculation in SlabChunk is wrong");
/* otherwise the linked list inside freed chunk isn't guaranteed to fit */ /* Make sure the linked list node fits inside a freed chunk */
StaticAssertStmt(MAXIMUM_ALIGNOF >= sizeof(int), if (chunkSize < sizeof(int))
"MAXALIGN too small to fit int32"); chunkSize = sizeof(int);
/* chunk, including SLAB header (both addresses nicely aligned) */ /* chunk, including SLAB header (both addresses nicely aligned) */
fullChunkSize = MAXALIGN(sizeof(SlabChunk) + MAXALIGN(chunkSize)); fullChunkSize = MAXALIGN(sizeof(SlabChunk) + MAXALIGN(chunkSize));