mm/memory: inline unmap_page_range() into __zap_vma_range()

Let's inline it into the single caller to reduce the number of confusing
unmap/zap helpers.

Get rid of the unnecessary BUG_ON().

[david@kernel.org: call the local variable simply "addr", per Lorenzo]
  Link: https://lkml.kernel.org/r/f7732d1c-0e85-4a14-948a-912c417018b5@kernel.org
Link: https://lkml.kernel.org/r/20260227200848.114019-12-david@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Arve <arve@android.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Carlos Llamas <cmllamas@google.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Dave Airlie <airlied@gmail.com>
Cc: David Ahern <dsahern@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jann Horn <jannh@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Namhyung kim <namhyung@kernel.org>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Todd Kjos <tkjos@android.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 12 insertions, 20 deletions

diff --git a/mm/memory.c b/mm/memory.c
index d1fd3cdd677a..8c77a765036f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2056,25 +2056,6 @@ static inline unsigned long zap_p4d_range(struct mmu_gather *tlb,
 	return addr;
 }
 
-static void unmap_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
-		unsigned long addr, unsigned long end,
-		struct zap_details *details)
-{
-	pgd_t *pgd;
-	unsigned long next;
-
-	BUG_ON(addr >= end);
-	tlb_start_vma(tlb, vma);
-	pgd = pgd_offset(vma->vm_mm, addr);
-	do {
-		next = pgd_addr_end(addr, end);
-		if (pgd_none_or_clear_bad(pgd))
-			continue;
-		next = zap_p4d_range(tlb, vma, pgd, addr, next, details);
-	} while (pgd++, addr = next, addr != end);
-	tlb_end_vma(tlb, vma);
-}
-
 static void __zap_vma_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		unsigned long start, unsigned long end,
 		struct zap_details *details)
@@ -2100,7 +2081,18 @@ static void __zap_vma_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			return;
 		__unmap_hugepage_range(tlb, vma, start, end, NULL, zap_flags);
 	} else {
-		unmap_page_range(tlb, vma, start, end, details);
+		unsigned long next, addr = start;
+		pgd_t *pgd;
+
+		tlb_start_vma(tlb, vma);
+		pgd = pgd_offset(vma->vm_mm, addr);
+		do {
+			next = pgd_addr_end(addr, end);
+			if (pgd_none_or_clear_bad(pgd))
+				continue;
+			next = zap_p4d_range(tlb, vma, pgd, addr, next, details);
+		} while (pgd++, addr = next, addr != end);
+		tlb_end_vma(tlb, vma);
 	}
 }