On 2023-06-19 at 15:56:34 -0400, Peter Colberg wrote:
> Replace all shifts by PAGE_SHIFT with PFN_DOWN() and PFN_PHYS() helper
> macros to convert between physical addresses and page frame numbers.
>
> These changes are cosmetic only; no functional changes.
>
> Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Peter Colberg <peter.colberg@xxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> v2:
> - Comment in commit message that changes are cosmetic only
> ---
> drivers/fpga/dfl-afu-dma-region.c | 7 ++++---
> drivers/fpga/dfl-afu-main.c | 5 +++--
> 2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/fpga/dfl-afu-dma-region.c b/drivers/fpga/dfl-afu-dma-region.c
> index 02b60fde0430..e8d54cfbb301 100644
> --- a/drivers/fpga/dfl-afu-dma-region.c
> +++ b/drivers/fpga/dfl-afu-dma-region.c
> @@ -10,6 +10,7 @@
> */
>
> #include <linux/dma-mapping.h>
> +#include <linux/pfn.h>
> #include <linux/sched/signal.h>
> #include <linux/uaccess.h>
> #include <linux/mm.h>
> @@ -34,7 +35,7 @@ void afu_dma_region_init(struct dfl_feature_platform_data *pdata)
> static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
> struct dfl_afu_dma_region *region)
> {
> - int npages = region->length >> PAGE_SHIFT;
> + int npages = PFN_DOWN(region->length);
I don't much prefer this change, it is not doing the phy addr to pfn
convertion. The macro name doesn't match what is doing here.
> struct device *dev = &pdata->dev->dev;
> int ret, pinned;
>
> @@ -82,7 +83,7 @@ static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
> static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
> struct dfl_afu_dma_region *region)
> {
> - long npages = region->length >> PAGE_SHIFT;
> + long npages = PFN_DOWN(region->length);
ditto
> struct device *dev = &pdata->dev->dev;
>
> unpin_user_pages(region->pages, npages);
> @@ -101,7 +102,7 @@ static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
> */
> static bool afu_dma_check_continuous_pages(struct dfl_afu_dma_region *region)
> {
> - int npages = region->length >> PAGE_SHIFT;
> + int npages = PFN_DOWN(region->length);
ditto
> int i;
>
> for (i = 0; i < npages - 1; i++)
> diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> index 7f621e96d3b8..048c9b418c8b 100644
> --- a/drivers/fpga/dfl-afu-main.c
> +++ b/drivers/fpga/dfl-afu-main.c
> @@ -16,6 +16,7 @@
>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/pfn.h>
> #include <linux/uaccess.h>
> #include <linux/fpga-dfl.h>
>
> @@ -816,7 +817,7 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
>
> pdata = dev_get_platdata(&pdev->dev);
>
> - offset = vma->vm_pgoff << PAGE_SHIFT;
> + offset = PFN_PHYS(vma->vm_pgoff);
ditto. The variables are offsets within file, not phys addr & pfn.
> ret = afu_mmio_region_get_by_offset(pdata, offset, size, ®ion);
> if (ret)
> return ret;
> @@ -837,7 +838,7 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
> vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
>
> return remap_pfn_range(vma, vma->vm_start,
> - (region.phys + (offset - region.offset)) >> PAGE_SHIFT,
> + PFN_DOWN(region.phys + (offset - region.offset)),
> size, vma->vm_page_prot);
> }
>
> --
> 2.28.0
>
