[folded-merged] fsdax-introduce-pgmap_request_folios-fix.patch removed from -mm tree

[folded-merged] fsdax-introduce-pgmap_request_folios-fix.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/memremap: mark folio_span_valid() as __maybe_unused
has been removed from the -mm tree.  Its filename was
     fsdax-introduce-pgmap_request_folios-fix.patch

This patch was dropped because it was folded into fsdax-introduce-pgmap_request_folios.patch

------------------------------------------------------
From: Nathan Chancellor <nathan@kernel.org>
Subject: mm/memremap: mark folio_span_valid() as __maybe_unused
Date: Tue, 18 Oct 2022 08:26:46 -0700

When building without CONFIG_DEBUG_VM, clang warns:

  mm/memremap.c:495:13: error: function 'folio_span_valid' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
  static bool folio_span_valid(struct dev_pagemap *pgmap, struct folio *folio,
              ^
  1 error generated.

folio_span_valid() is only used within a instance of VM_WARN_ON_ONCE(),
which evaluates to BUILD_BUG_ON_INVALID() with CONFIG_DEBUG_VM=n, which
ultimately resolves to sizeof(), which is fully resolved at compile
time. Basically, the warning is flagging that folio_span_valid() is
only used in a compile time context and will not be called at run time.

Since this is expected given the configuration, mark folio_span_valid()
as __maybe_unused so that there is no warning.

Link: https://lkml.kernel.org/r/20221018152645.3195108-1-nathan@kernel.org
Fixes: ("fsdax: introduce pgmap_request_folios()")
  Link: https://github.com/ClangBuiltLinux/linux/issues/1739
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memremap.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/mm/memremap.c~fsdax-introduce-pgmap_request_folios-fix
+++ a/mm/memremap.c
@@ -531,8 +531,9 @@ void zone_device_page_init(struct page *
 }
 EXPORT_SYMBOL_GPL(zone_device_page_init);
 
-static bool folio_span_valid(struct dev_pagemap *pgmap, struct folio *folio,
-			     int nr_folios)
+static __maybe_unused bool folio_span_valid(struct dev_pagemap *pgmap,
+					    struct folio *folio,
+					    int nr_folios)
 {
 	unsigned long pfn_start, pfn_end;
 
_

Patches currently in -mm which might be from nathan@kernel.org are

fsdax-introduce-pgmap_request_folios.patch