sparc/mm: avoid calling arch_enter/leave_lazy_mmu() in set_ptes

commit eb61ad14 upstream.

With commit 1a10a44d ("sparc64: implement the new page table range
API") set_ptes was added to the sparc architecture.  The implementation
included calling arch_enter/leave_lazy_mmu() calls.

The patch removes the usage of arch_enter/leave_lazy_mmu() since this
implies nesting of lazy mmu regions which is not supported.  Without this
fix, lazy mmu mode is effectively disabled because we exit the mode after
the first set_ptes:

remap_pte_range()
  -> arch_enter_lazy_mmu()
  -> set_ptes()
      -> arch_enter_lazy_mmu()
      -> arch_leave_lazy_mmu()
  -> arch_leave_lazy_mmu()

Powerpc suffered the same problem and fixed it in a corresponding way with
commit 47b8def9 ("powerpc/mm: Avoid calling
arch_enter/leave_lazy_mmu() in set_ptes").

Link: https://lkml.kernel.org/r/20250303141542.3371656-5-ryan.roberts@arm.com


Fixes: 1a10a44d ("sparc64: implement the new page table range API")
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juegren Gross <jgross@suse.com>
Cc: Matthew Wilcow (Oracle) <willy@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>