summaryrefslogtreecommitdiff
path: root/kernel/dma
diff options
context:
space:
mode:
authorWei Liu <wei.liu@kernel.org>2022-01-04 16:11:19 +0000
committerWei Liu <wei.liu@kernel.org>2022-01-04 16:11:19 +0000
commit2deb55d9f57bb7a877c0d77115cc4077e1e974ff (patch)
tree1c808331a97c6809ea2378f6f10b3ccb686d2dd9 /kernel/dma
parente1878402ab2dca12d1426f2fea39757943f3332c (diff)
swiotlb: Add CONFIG_HAS_IOMEM check around swiotlb_mem_remap()
HAS_IOMEM option may not be selected on some platforms (e.g, s390) and this will cause compilation failure due to missing memremap() implementation. Fix it by stubbing out swiotlb_mem_remap when CONFIG_HAS_IOMEM is not set. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/swiotlb.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index b36c1cdd0c4f..f1e7ea160b43 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -163,6 +163,7 @@ static inline unsigned long nr_slots(u64 val)
* when swiotlb_unencrypted_base is set. (e.g. for Hyper-V AMD SEV-SNP
* Isolation VMs).
*/
+#ifdef CONFIG_HAS_IOMEM
static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
{
void *vaddr = NULL;
@@ -178,6 +179,12 @@ static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
return vaddr;
}
+#else
+static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
+{
+ return NULL;
+}
+#endif
/*
* Early SWIOTLB allocation may be too early to allow an architecture to