* [PATCH] MIPS: ath79: reduce ARCH_DMA_MINALIGN
@ 2026-05-27 22:25 Rosen Penev
2026-06-15 10:28 ` Thomas Bogendoerfer
0 siblings, 1 reply; 2+ messages in thread
From: Rosen Penev @ 2026-05-27 22:25 UTC (permalink / raw)
To: linux-mips; +Cc: Thomas Bogendoerfer, open list
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] MIPS: ath79: reduce ARCH_DMA_MINALIGN
2026-05-27 22:25 [PATCH] MIPS: ath79: reduce ARCH_DMA_MINALIGN Rosen Penev
@ 2026-06-15 10:28 ` Thomas Bogendoerfer
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Bogendoerfer @ 2026-06-15 10:28 UTC (permalink / raw)
To: Rosen Penev; +Cc: linux-mips, open list
On Wed, May 27, 2026 at 03:25:04PM -0700, Rosen Penev wrote:
> 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
applied to mips-next
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
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