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mm, x86: use for_each_valid_pfn() from __ioremap_check_ram()

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Instead of calling pfn_valid() separately for every single PFN in the
range, use for_each_valid_pfn() and only look at the ones which are.

Link: https://lkml.kernel.org/r/20250423133821.789413-6-dwmw2@infradead.org
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Ruihan Li <lrh2000@pku.edu.cn>
Cc: Will Deacon <will@kernel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Woodhouse 2025-04-23 14:33:41 +01:00 • committed by Andrew Morton
parent 312eca8a14
commit 49d8d78f8c
1 changed files with 3 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
arch/x86/mm/ioremap.c
View file

@ -71,7 +71,7 @@ int ioremap_change_attr(unsigned long vaddr, unsigned long size,
static unsigned int __ioremap_check_ram(struct resource *res)
{
unsigned long start_pfn, stop_pfn;
unsigned long i;
unsigned long pfn;
if ((res->flags & IORESOURCE_SYSTEM_RAM) != IORESOURCE_SYSTEM_RAM)
return 0;
@ -79,9 +79,8 @@ static unsigned int __ioremap_check_ram(struct resource *res)
start_pfn = (res->start + PAGE_SIZE - 1) >> PAGE_SHIFT;
stop_pfn = (res->end + 1) >> PAGE_SHIFT;
if (stop_pfn > start_pfn) {
for (i = 0; i < (stop_pfn - start_pfn); ++i)
if (pfn_valid(start_pfn + i) &&
!PageReserved(pfn_to_page(start_pfn + i)))
for_each_valid_pfn(pfn, start_pfn, stop_pfn)
if (!PageReserved(pfn_to_page(pfn)))
return IORES_MAP_SYSTEM_RAM;
}