diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2025-04-23 14:33:38 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-05-12 23:50:43 -0700 |
| commit | 928930c2e0a8e1d9252aedb1fa9be83c3669dfd7 (patch) | |
| tree | e06b6fc92b6ded47623948db4ebdbbb7791b79ed | |
| parent | f88ce2c84a341f44a7d00bc10868714bc4751f7e (diff) | |
mm: implement for_each_valid_pfn() for CONFIG_FLATMEM
In the FLATMEM case, the default pfn_valid() just checks that the PFN is
within the range [ ARCH_PFN_OFFSET .. ARCH_PFN_OFFSET + max_mapnr ).
The for_each_valid_pfn() function can therefore be a simple for() loop
using those as min/max respectively.
Link: https://lkml.kernel.org/r/20250423133821.789413-3-dwmw2@infradead.org
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.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>
| -rw-r--r-- | include/asm-generic/memory_model.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h index a3b5029aebbd..74d0077cc5fa 100644 --- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -30,7 +30,15 @@ static inline int pfn_valid(unsigned long pfn) return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; } #define pfn_valid pfn_valid -#endif + +#ifndef for_each_valid_pfn +#define for_each_valid_pfn(pfn, start_pfn, end_pfn) \ + for ((pfn) = max_t(unsigned long, (start_pfn), ARCH_PFN_OFFSET); \ + (pfn) < min_t(unsigned long, (end_pfn), \ + ARCH_PFN_OFFSET + max_mapnr); \ + (pfn)++) +#endif /* for_each_valid_pfn */ +#endif /* valid_pfn */ #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |