[merged mm-stable] mm-implement-for_each_valid_pfn-for-config_flatmem.patch removed from -mm tree

[merged mm-stable] mm-implement-for_each_valid_pfn-for-config_flatmem.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: implement for_each_valid_pfn() for CONFIG_FLATMEM
has been removed from the -mm tree.  Its filename was
     mm-implement-for_each_valid_pfn-for-config_flatmem.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: David Woodhouse <dwmw@amazon.co.uk>
Subject: mm: implement for_each_valid_pfn() for CONFIG_FLATMEM
Date: Wed, 23 Apr 2025 14:33:38 +0100

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>
---

 include/asm-generic/memory_model.h |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/include/asm-generic/memory_model.h~mm-implement-for_each_valid_pfn-for-config_flatmem
+++ a/include/asm-generic/memory_model.h
@@ -30,7 +30,15 @@ static inline int pfn_valid(unsigned lon
 	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)
 
_

Patches currently in -mm which might be from dwmw@amazon.co.uk are