When building with C=1, sparse reports some issues regarding endianness annotations:
arm-smmu-v3.c:221:26: warning: cast to restricted __le64 arm-smmu-v3.c:221:24: warning: incorrect type in assignment (different base types) arm-smmu-v3.c:221:24: expected restricted __le64 [usertype] arm-smmu-v3.c:221:24: got unsigned long long [usertype] arm-smmu-v3.c:229:20: warning: incorrect type in argument 1 (different base types) arm-smmu-v3.c:229:20: expected restricted __le64 [usertype] *[assigned] dst arm-smmu-v3.c:229:20: got unsigned long long [usertype] *ent arm-smmu-v3.c:229:25: warning: incorrect type in argument 2 (different base types) arm-smmu-v3.c:229:25: expected unsigned long long [usertype] *[assigned] src arm-smmu-v3.c:229:25: got restricted __le64 [usertype] * arm-smmu-v3.c:396:20: warning: incorrect type in argument 1 (different base types) arm-smmu-v3.c:396:20: expected restricted __le64 [usertype] *[assigned] dst arm-smmu-v3.c:396:20: got unsigned long long * arm-smmu-v3.c:396:25: warning: incorrect type in argument 2 (different base types) arm-smmu-v3.c:396:25: expected unsigned long long [usertype] *[assigned] src arm-smmu-v3.c:396:25: got restricted __le64 [usertype] * arm-smmu-v3.c:1349:32: warning: invalid assignment: |= arm-smmu-v3.c:1349:32: left side has type restricted __le64 arm-smmu-v3.c:1349:32: right side has type unsigned long arm-smmu-v3.c:1396:53: warning: incorrect type in argument 3 (different base types) arm-smmu-v3.c:1396:53: expected restricted __le64 [usertype] *dst arm-smmu-v3.c:1396:53: got unsigned long long [usertype] *strtab arm-smmu-v3.c:1424:39: warning: incorrect type in argument 1 (different base types) arm-smmu-v3.c:1424:39: expected unsigned long long [usertype] *[assigned] strtab arm-smmu-v3.c:1424:39: got restricted __le64 [usertype] *l2ptr While harmless, they are incorrect and could hide actual errors during development. Fix them. Signed-off-by: Jean-Philippe Brucker <[email protected]> --- There is another false positive due to passing INT_MIN to cmpxchg, and __cmpxchg* to truncate them to u8 and u16: arch/arm64/include/asm/cmpxchg.h:172:1: warning: cast truncates bits from constant value (ffffffff80000000 becomes 0) arch/arm64/include/asm/cmpxchg.h:172:1: warning: cast truncates bits from constant value (ffffffff80000000 becomes 0) I haven't found a satisfying fix so far, except adding __force to __cmpxchg_case* which could hide actual bugs. --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index c192544e874b..83acc1e5888e 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -867,7 +867,7 @@ static void queue_write(__le64 *dst, u64 *src, size_t n_dwords) *dst++ = cpu_to_le64(*src++); } -static void queue_read(__le64 *dst, u64 *src, size_t n_dwords) +static void queue_read(u64 *dst, __le64 *src, size_t n_dwords) { int i; @@ -1939,7 +1939,7 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid, arm_smmu_cmdq_issue_cmd(smmu, &prefetch_cmd); } -static void arm_smmu_init_bypass_stes(u64 *strtab, unsigned int nent) +static void arm_smmu_init_bypass_stes(__le64 *strtab, unsigned int nent) { unsigned int i; -- 2.28.0 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
