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dma-pool: fix too large DMA pools on medium memory size systems

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On systems with at least 32 MiB, but less than 32 GiB of RAM, the DMA
memory pools are much larger than intended (e.g. 2 MiB instead of 128
KiB on a 256 MiB system).

Fix this by correcting the calculation of the number of GiBs of RAM in
the system.  Invert the order of the min/max operations, to keep on
calculating in pages until the last step, which aids readability.

Fixes: 1d659236fb ("dma-pool: scale the default DMA coherent pool size with memory capacity")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Geert Uytterhoeven 2020-06-08 15:22:17 +02:00 committed by Christoph Hellwig
parent abfbb29297
commit 3ee06a6d53
1 changed files with 3 additions and 4 deletions
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7
kernel/dma/pool.c
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@ -175,10 +175,9 @@ static int __init dma_atomic_pool_init(void)
* sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1.
*/
if (!atomic_pool_size) {
atomic_pool_size = max(totalram_pages() >> PAGE_SHIFT, 1UL) *
SZ_128K;
atomic_pool_size = min_t(size_t, atomic_pool_size,
1 << (PAGE_SHIFT + MAX_ORDER-1));
unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K);
pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES);
atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K);
}
INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);