[PATCH] mips: ralink: mt7621: avoid casting away __iomem in wraparound test

[Rosen Penev <rosenp@gmail.com>]

CPHYSADDR() casts its argument to an integer, which strips the __iomem
annotation from dm and triggers a sparse warning. Compute the physical
address from detect_magic directly. The result is unchanged since the
sum never exceeds the 512MB KSEG mask.

Fixes: 4ddaf88aadd3 ("mips: ralink: mt7621: add missing __iomem")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202610041411.uJXWXF8i-lkp@intel.com/
Assisted-by: LLM
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 arch/mips/ralink/mt7621.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/ralink/mt7621.c b/arch/mips/ralink/mt7621.c
index ae7b8cfedd5f..2d10c74b13c1 100644
--- a/arch/mips/ralink/mt7621.c
+++ b/arch/mips/ralink/mt7621.c
@@ -65,7 +65,7 @@ static bool __init mt7621_addr_wraparound_test(phys_addr_t size)
 {
 	void __iomem *dm = (void __iomem *)KSEG1ADDR(&detect_magic);
 
-	if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE)
+	if (CPHYSADDR(&detect_magic) + size >= MT7621_LOWMEM_MAX_SIZE)
 		return true;
 	__raw_writel(MT7621_MEM_TEST_PATTERN, dm);
 	if (__raw_readl(dm) != __raw_readl(dm + size))
-- 
2.56.0