From: Anders Roxell Date: Tue, 30 Jul 2019 15:20:11 +0000 (+0200) Subject: iommu/arm-smmu: Mark expected switch fall-through X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=11f4fe9ba3c85a4efac7ec25e75056a9b612d9da;p=linux.git iommu/arm-smmu: Mark expected switch fall-through Now that -Wimplicit-fallthrough is passed to GCC by default, the following warning shows up: ../drivers/iommu/arm-smmu-v3.c: In function ‘arm_smmu_write_strtab_ent’: ../drivers/iommu/arm-smmu-v3.c:1189:7: warning: this statement may fall through [-Wimplicit-fallthrough=] if (disable_bypass) ^ ../drivers/iommu/arm-smmu-v3.c:1191:3: note: here default: ^~~~~~~ Rework so that the compiler doesn't warn about fall-through. Make it clearer by calling 'BUG_ON()' when disable_bypass is set, and always 'break;' Signed-off-by: Anders Roxell Acked-by: Will Deacon Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index a9a9fabd39680..c5c93e48b4dbd 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1186,8 +1186,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid, ste_live = true; break; case STRTAB_STE_0_CFG_ABORT: - if (disable_bypass) - break; + BUG_ON(!disable_bypass); + break; default: BUG(); /* STE corruption */ }