This is a note to let you know that I've just added the patch titled
ARM: 9323/1: mm: Fix ARCH_LOW_ADDRESS_LIMIT when CONFIG_ZONE_DMA
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-9323-1-mm-fix-arch_low_address_limit-when-config.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a26f6e7163018f27e1c52f03a67bbfe6be8b29d6
Author: wahrenst <wahrenst@xxxxxxx>
Date: Wed Sep 6 22:40:12 2023 +0100
ARM: 9323/1: mm: Fix ARCH_LOW_ADDRESS_LIMIT when CONFIG_ZONE_DMA
[ Upstream commit 399da29ff5eb3f675c71423bec4cf2208f218576 ]
Configuring VMSPLIT_2G + LPAE on Raspberry Pi 4 leads to SWIOTLB
buffer allocation beyond platform dma_zone_size of SZ_1G, which
results in broken SD card boot.
So fix this be setting ARCH_LOW_ADDRESS_LIMIT in CONFIG_ZONE_DMA
case.
Suggested-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Fixes: e9faf9b0b07a ("ARM: add multi_v7_lpae_defconfig")
Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm/include/asm/dma.h b/arch/arm/include/asm/dma.h
index c6aded1b069cf..e2a1916013e75 100644
--- a/arch/arm/include/asm/dma.h
+++ b/arch/arm/include/asm/dma.h
@@ -12,6 +12,9 @@
extern phys_addr_t arm_dma_zone_size; \
arm_dma_zone_size && arm_dma_zone_size < (0x100000000ULL - PAGE_OFFSET) ? \
(PAGE_OFFSET + arm_dma_zone_size) : 0xffffffffUL; })
+
+extern phys_addr_t arm_dma_limit;
+#define ARCH_LOW_ADDRESS_LIMIT arm_dma_limit
#endif
#ifdef CONFIG_ISA_DMA_API
