Re: [PATCH] Swiotlb: Add CONFIG_HAS_IOMEM check around memremap() in the swiotlb_mem_remap()

2022-01-04 Thread Wei Liu 
On Tue, Jan 04, 2022 at 04:03:07PM +0100, Christoph Hellwig wrote:
> On Tue, Jan 04, 2022 at 02:51:55PM +, Wei Liu wrote:
> > > Please stub out all of swiotlb_mem_remap instead of the ifdef inside the
> > > function.
> > 
> > Does this look okay to you?
> 
> Yes, thanks!

Thanks for confirming!

I will turn this into an ack and apply the diff to hyperv-next.

Wei.
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Re: [PATCH] Swiotlb: Add CONFIG_HAS_IOMEM check around memremap() in the swiotlb_mem_remap()

2022-01-04 Thread Christoph Hellwig 
On Tue, Jan 04, 2022 at 02:51:55PM +, Wei Liu wrote:
> > Please stub out all of swiotlb_mem_remap instead of the ifdef inside the
> > function.
> 
> Does this look okay to you?

Yes, thanks!
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Re: [PATCH] Swiotlb: Add CONFIG_HAS_IOMEM check around memremap() in the swiotlb_mem_remap()

2022-01-04 Thread Wei Liu 
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 
> > 
> > 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 
> > Signed-off-by: Tianyu Lan 
> > ---
> >  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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Re: [PATCH] Swiotlb: Add CONFIG_HAS_IOMEM check around memremap() in the swiotlb_mem_remap()

2022-01-02 Thread Christoph Hellwig 
On Fri, Dec 31, 2021 at 11:56:40AM -0500, Tianyu Lan wrote:
> From: Tianyu Lan 
> 
> 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 
> Signed-off-by: Tianyu Lan 
> ---
>  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.
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Re: [PATCH] Swiotlb: Add CONFIG_HAS_IOMEM check around memremap() in the swiotlb_mem_remap()

2022-01-02 Thread Wei Liu 
On Fri, Dec 31, 2021 at 11:56:40AM -0500, Tianyu Lan wrote:
> From: Tianyu Lan 
> 
> 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

miss -> missingk

> adding HAS_IOMEM check around memremap() in the swiotlb.c.
> 
> Reported-by: kernel test robot 
> Signed-off-by: Tianyu Lan 

Hi Christoph

Are you happy with this fix?

Thanks,
Wei.

> ---
>  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
>   if (swiotlb_unencrypted_base) {
>   phys_addr_t paddr = mem->start + swiotlb_unencrypted_base;
>  
> @@ -175,6 +176,7 @@ static void *swiotlb_mem_remap(struct io_tlb_mem *mem, 
> unsigned long bytes)
>   pr_err("Failed to map the unencrypted memory %pa size 
> %lx.\n",
>  , bytes);
>   }
> +#endif
>  
>   return vaddr;
>  }
> -- 
> 2.25.1
> 
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