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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=IZWKmGqa c=1 sm=1 tr=0 ts=69a1af65 cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=6nO30s3o7FuWeffXwhKHTA==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=QyXUC8HyAAAA:8 a=EUspDBNiAAAA:8 a=7CQSdrXTAAAA:8 a=0JN81gmDEfperBWzToAA:9 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-GUID: UtA_V8hi6vszo70QUGyyu9VBSEU4k2_y X-Proofpoint-ORIG-GUID: UtA_V8hi6vszo70QUGyyu9VBSEU4k2_y X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDEzMSBTYWx0ZWRfX1bSZcXScDPXu E3dmlL997E/CKjLKsjT2+eF6cws/nNOSSuIT67XganonV2+4mKX4cKn1xLnONBbxn2wQqyVvRtj bmQw8y1R6ntSSll57BxvBt2sY8MjoT6NQDWduM26PIJbIxEFSUIjIjcELrWB0CGGcmSjS3dMwuv wcn8KiGuKK8DhXxpzSbZ2aFGt7wSvGtWBfK27m5nu7PaIKRFwtB7xYeMNsCZoP9MOOz8aI6BT1Y WUyB8xFI1HEPWtZhNjddoCTVPPO5hRSyhL5hSe59mOfQ5XPSNZ9s9vM2ZduAnnP4JHM9udKVxAD Yf0ENcKqRp87QUW87mhpSHhk4lsxAtDLxxtmYtiM+s5ThJmRHqohBhVIEA4D1xvT6d1l7sf8BeK +GRm6vmGxb8oPwZxv+wgIq9mG1Yy30mAaVjNoJrr+J1BzTyRPci/lNkEa8wWO+uITspxLGwvHY4 /tlLk3DY0GjrLO4/5zw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270131 On 27/02/2026 15:06, Ben Horgan wrote: > Hi Krzysztof, > > On 2/16/26 11:02, Krzysztof Kozlowski wrote: >> 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 >> --- >> 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 3e8d564a0c64..2de41b47c138 100644 >> --- a/drivers/resctrl/test_mpam_devices.c >> +++ b/drivers/resctrl/test_mpam_devices.c >> @@ -324,7 +324,7 @@ static void test_mpam_enable_merge_features(struct kunit *test) >> >> 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; >> >> @@ -339,7 +339,7 @@ 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); >> >> mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0); >> KUNIT_EXPECT_EQ(test, test_result[0], 0); > > > This change looks good to me. As sparse is more broken I needed to use > the patch from [1] to reproduce this. Copied here for convenience. The branch from Al Viro was working fine at that time, now merged to master. > > diff --git a/include/linux/gfp.h b/include/linux/gfp.h > index 2b30a0529d48..90536b2bc42e 100644 > --- a/include/linux/gfp.h > +++ b/include/linux/gfp.h > @@ -14,8 +14,8 @@ struct vm_area_struct; > struct mempolicy; > > /* Helper macro to avoid gfp flags if they are the default one */ > -#define __default_gfp(a,...) a > -#define default_gfp(...) __default_gfp(__VA_ARGS__ __VA_OPT__(,) > GFP_KERNEL) > +#define __default_gfp(a,b,...) b > +#define default_gfp(...) __default_gfp(,##__VA_ARGS__,GFP_KERNEL) > > /* Convert GFP flags to their corresponding migrate type */ > #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) > > There is a kernel test robot report [2] and that asks for these tags: That I did not know. Anyone can run sparse, as I am doing every now and then, and find issues. > > Reported-by: kernel test robot > Closes: > https://lore.kernel.org/oe-kbuild-all/202512160133.eAzPdJv2-lkp@intel.com/ > > Acked-by: Ben Horgan Best regards, Krzysztof