Florian Fainelli c454639172 ARM: 9216/1: Fix MAX_DMA_ADDRESS overflow ... [ Upstream commit fb0fd3469ead5b937293c213daa1f589b4b7ce46 ] Commit 26f09e9b3a ("mm/memblock: add memblock memory allocation apis") added a check to determine whether arm_dma_zone_size is exceeding the amount of kernel virtual address space available between the upper 4GB virtual address limit and PAGE_OFFSET in order to provide a suitable definition of MAX_DMA_ADDRESS that should fit within the 32-bit virtual address space. The quantity used for comparison was off by a missing trailing 0, leading to MAX_DMA_ADDRESS to be overflowing a 32-bit quantity. This was caught thanks to CONFIG_DEBUG_VIRTUAL on the bcm2711 platform where we define a dma_zone_size of 1GB and we have a PAGE_OFFSET value of 0xc000_0000 (CONFIG_VMSPLIT_3G) leading to MAX_DMA_ADDRESS being 0x1_0000_0000 which overflows the unsigned long type used throughout __pa() and then __virt_addr_valid(). Because the virtual address passed to __virt_addr_valid() would now be 0, the function would loudly warn and flood the kernel log, thus making the platform unable to boot properly. Fixes: 26f09e9b3a ("mm/memblock: add memblock memory allocation apis") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-08-03 12:00:50 +02:00
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asm	ARM: 9216/1: Fix MAX_DMA_ADDRESS overflow	2022-08-03 12:00:50 +02:00
debug	ARM: imx: rename DEBUG_IMX21_IMX27_UART to DEBUG_IMX27_UART	2022-01-27 10:54:11 +01:00
uapi/asm