From fb75437b447875ae97ea3a173e734dbd553a3881 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Fri, 6 Mar 2026 18:27:18 +0000 Subject: [PATCH] arm_mpam: Force __iomem casts Code allocates standard kernel memory to pass to the MPAM, which expects __iomem. The code is safe, because __iomem accessors should work fine on kernel mapped memory, however leads to sparse warnings: test_mpam_devices.c:327:42: warning: incorrect type in initializer (different address spaces) test_mpam_devices.c:327:42: expected char [noderef] __iomem *buf test_mpam_devices.c:327:42: got void * test_mpam_devices.c:342:24: warning: cast removes address space '__iomem' of expression Cast the pointer to memory via __force to silence them. Signed-off-by: Krzysztof Kozlowski Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202512160133.eAzPdJv2-lkp@intel.com/ Acked-by: Ben Horgan Signed-off-by: James Morse Signed-off-by: Will Deacon --- drivers/resctrl/test_mpam_devices.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/resctrl/test_mpam_devices.c b/drivers/resctrl/test_mpam_devices.c index 75bd41bcc395..31871f519729 100644 --- a/drivers/resctrl/test_mpam_devices.c +++ b/drivers/resctrl/test_mpam_devices.c @@ -332,7 +332,7 @@ static void __test_mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd) static void test_mpam_reset_msc_bitmap(struct kunit *test) { - char __iomem *buf = kunit_kzalloc(test, SZ_16K, GFP_KERNEL); + char __iomem *buf = (__force char __iomem *)kunit_kzalloc(test, SZ_16K, GFP_KERNEL); struct mpam_msc fake_msc = {}; u32 *test_result; @@ -347,7 +347,7 @@ static void test_mpam_reset_msc_bitmap(struct kunit *test) mutex_init(&fake_msc.part_sel_lock); mutex_lock(&fake_msc.part_sel_lock); - test_result = (u32 *)(buf + MPAMCFG_CPBM); + test_result = (__force u32 *)(buf + MPAMCFG_CPBM); __test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0); KUNIT_EXPECT_EQ(test, test_result[0], 0);