On Sun, Jan 02, 2022 at 11:54:46PM -0800, Christoph Hellwig wrote:
> On Fri, Dec 31, 2021 at 11:56:40AM -0500, Tianyu Lan wrote:
> > From: Tianyu Lan <tianyu....@microsoft.com>
> >
> > HAS_IOMEM option may not be selected on some platforms(e.g, s390) and this
> > will cause compile error due to miss memremap() implementation. Fix it via
> > adding HAS_IOMEM check around memremap() in the swiotlb.c.
> >
> > Reported-by: kernel test robot <l...@intel.com>
> > Signed-off-by: Tianyu Lan <tianyu....@microsoft.com>
> > ---
> > kernel/dma/swiotlb.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> > index b36c1cdd0c4f..3de651ba38cc 100644
> > --- a/kernel/dma/swiotlb.c
> > +++ b/kernel/dma/swiotlb.c
> > @@ -167,6 +167,7 @@ static void *swiotlb_mem_remap(struct io_tlb_mem *mem,
> > unsigned long bytes)
> > {
> > void *vaddr = NULL;
> >
> > +#ifdef CONFIG_HAS_IOMEM
>
> Please stub out all of swiotlb_mem_remap instead of the ifdef inside the
> function.
Does this look okay to you?
---8<---
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
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