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SubjectRe: [PATCH v5 2/6] mm: ioremap: Use more sensibly name in ioremap_prot()
On 06/08/22 at 12:16pm, Baoquan He wrote:
> On 06/07/22 at 08:50pm, Kefeng Wang wrote:
> > Use more meaningful and sensibly naming phys_addr
> > instead addr in ioremap_prot().
> >
> > Suggested-by: Andrew Morton <akpm@linux-foundation.org>
> > Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
> > Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> > ---
> > include/asm-generic/io.h | 3 ++-
> > mm/ioremap.c | 14 ++++++++------
> > 2 files changed, 10 insertions(+), 7 deletions(-)
> >
> > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > index 7ce93aaf69f8..b76379628a02 100644
> > --- a/include/asm-generic/io.h
> > +++ b/include/asm-generic/io.h
> > @@ -964,7 +964,8 @@ static inline void iounmap(volatile void __iomem *addr)
> > #elif defined(CONFIG_GENERIC_IOREMAP)
> > #include <linux/pgtable.h>
> >
> > -void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
> > +void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
> > + unsigned long prot);
> > void iounmap(volatile void __iomem *addr);
> >
> > static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
> > diff --git a/mm/ioremap.c b/mm/ioremap.c
> > index 5fe598ecd9b7..2d754b48d230 100644
> > --- a/mm/ioremap.c
> > +++ b/mm/ioremap.c
> > @@ -11,20 +11,21 @@
> > #include <linux/io.h>
> > #include <linux/export.h>
> >
> > -void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
> > +void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
> > + unsigned long prot)
> > {
> > unsigned long offset, vaddr;
> > phys_addr_t last_addr;
> > struct vm_struct *area;
> >
> > /* Disallow wrap-around or zero size */
> > - last_addr = addr + size - 1;
> > - if (!size || last_addr < addr)
> > + last_addr = phys_addr + size - 1;
> > + if (!size || last_addr < phys_addr)
> > return NULL;
> >
> > /* Page-align mappings */
> > - offset = addr & (~PAGE_MASK);
> > - addr -= offset;
> > + offset = phys_addr & (~PAGE_MASK);
> ~~~ use offset_in_page() instead?

Sorry, this patch only does s/addr/phys_addr/, please ignore this comment.

>
> Other than this nitpick, this looks good to me.
>
> Reviewed-by: Baoquan He <bhe@redhat.com>
>
> > + phys_addr -= offset;
> > size = PAGE_ALIGN(size + offset);
> >
> > area = get_vm_area_caller(size, VM_IOREMAP,
> > @@ -33,7 +34,8 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
> > return NULL;
> > vaddr = (unsigned long)area->addr;
> >
> > - if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
> > + if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
> > + __pgprot(prot))) {
> > free_vm_area(area);
> > return NULL;
> > }
> > --
> > 2.35.3
> >
> >
>

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