From: Qingfang Deng <qingfang.deng@linux.dev>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Qingfang Deng <qingfang.deng@linux.dev>,
linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Mieczyslaw Nalewaj <namiltd@yahoo.com>,
Felix Fietkau <nbd@nbd.name>, Hauke Mehrtens <hauke@hauke-m.de>,
Aleksander Jan Bajkowski <olek2@wp.pl>,
Christian Marangi <ansuelsmth@gmail.com>,
Rosen Penev <rosenp@gmail.com>,
Nick Hainke <vincent@systemli.org>,
openwrt-devel@lists.openwrt.org
Subject: [PATCH] MIPS: ralink: reduce ARCH_DMA_MINALIGN
Date: Tue, 28 Apr 2026 16:25:40 +0800 [thread overview]
Message-ID: <20260428082543.95896-1-qingfang.deng@linux.dev> (raw)
Currently, Ralink SoCs use the default ARCH_DMA_MINALIGN value of 128
bytes defined in mach-generic. This is excessive for these platforms
and leads to significant memory waste in kmalloc.
Override ARCH_DMA_MINALIGN to use L1_CACHE_BYTES, which is 16 bytes for
RT288X and 32 bytes for other Ralink SoCs.
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
---
arch/mips/include/asm/mach-ralink/kmalloc.h | 9 +++++++++
1 file changed, 9 insertions(+)
create mode 100644 arch/mips/include/asm/mach-ralink/kmalloc.h
diff --git a/arch/mips/include/asm/mach-ralink/kmalloc.h b/arch/mips/include/asm/mach-ralink/kmalloc.h
new file mode 100644
index 000000000000..1693209d3f37
--- /dev/null
+++ b/arch/mips/include/asm/mach-ralink/kmalloc.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_RALINK_KMALLOC_H
+#define __ASM_MACH_RALINK_KMALLOC_H
+
+#ifdef CONFIG_DMA_NONCOHERENT
+#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
+#endif
+
+#endif /* __ASM_MACH_RALINK_KMALLOC_H */
--
2.43.0
next reply other threads:[~2026-04-28 8:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-28 8:25 Qingfang Deng [this message]
2026-05-26 14:42 ` [PATCH] MIPS: ralink: reduce ARCH_DMA_MINALIGN Thomas Bogendoerfer
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