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From: Rosen Penev <rosenp@gmail.com>
To: linux-mips@vger.kernel.org
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] MIPS: ath79: reduce ARCH_DMA_MINALIGN
Date: Wed, 27 May 2026 15:25:04 -0700	[thread overview]
Message-ID: <20260527222504.17381-1-rosenp@gmail.com> (raw)

Currently, ath79 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 32 bytes for
ath79 SoCs.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 arch/mips/include/asm/mach-ath79/kmalloc.h | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 arch/mips/include/asm/mach-ath79/kmalloc.h

diff --git a/arch/mips/include/asm/mach-ath79/kmalloc.h b/arch/mips/include/asm/mach-ath79/kmalloc.h
new file mode 100644
index 000000000000..954f5d6e0dd0
--- /dev/null
+++ b/arch/mips/include/asm/mach-ath79/kmalloc.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_ATH79_KMALLOC_H
+#define __ASM_MACH_ATH79_KMALLOC_H
+
+#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
+
+#endif /* __ASM_MACH_ATH79_KMALLOC_H */
-- 
2.54.0


             reply	other threads:[~2026-05-27 22:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-27 22:25 Rosen Penev [this message]
2026-06-15 10:28 ` [PATCH] MIPS: ath79: reduce ARCH_DMA_MINALIGN Thomas Bogendoerfer

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