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29 lines
1.0 KiB
Diff
29 lines
1.0 KiB
Diff
From 16bdf3e76fec6ddb44f1fcf221139fb39d225031 Mon Sep 17 00:00:00 2001
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From: Igor Pecovnik <igor.pecovnik@gmail.com>
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Date: Sat, 2 Jan 2021 05:23:55 +0000
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Subject: [PATCH] kernel: dma: adjust default coherent_pool to 2MiB
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---
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kernel/dma/pool.c | 8 +++-----
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1 file changed, 3 insertions(+), 5 deletions(-)
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--- a/kernel/dma/pool.c
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+++ b/kernel/dma/pool.c
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@@ -192,13 +192,11 @@ static int __init dma_atomic_pool_init(v
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int ret = 0;
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/*
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- * If coherent_pool was not used on the command line, default the pool
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- * sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1.
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+ * Always use 2MiB as default pool size.
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+ * See: https://forum.armbian.com/topic/4811-uas-mainline-kernel-coherent-pool-memory-size/
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*/
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if (!atomic_pool_size) {
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- unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K);
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- pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES);
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- atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K);
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+ atomic_pool_size = SZ_2M;
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}
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INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);
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