linux-kernel - [PATCH for mm-unstable 1/3] mm/vmscan: Use folio_test

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Date:   Wed,  4 May 2022 20:07:56 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org, willy@...radead.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        SeongJae Park <sj@...nel.org>
Subject: [PATCH for mm-unstable 1/3] mm/vmscan: Use folio_test_transhuge() for THP check

Commit 22bf1b68e572 ("vmscan: remove remaining uses of page in
shrink_page_list") on 'mm-unstable' replaces 'PageTransHuge()' with
'folio_test_large()' instead of 'folio_test_transhuge()'.  This results
in below build error when 'CONFIG_TRANSPARENT_HUGEPAGE' is unset.

      CC      mm/vmscan.o
    In file included from <command-line>:
    In function ‘can_split_folio’,
        inlined from ‘shrink_page_list’ at .../linux/mm/vmscan.c:1719:11:
    .../linux/include/linux/compiler_types.h:352:38: error: call to ‘__compiletime_assert_178’ declared with attribute error: BUILD_BUG failed
      352 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
          |                                      ^
    .../linux/include/linux/compiler_types.h:333:4: note: in definition of macro ‘__compiletime_assert’
      333 |    prefix ## suffix();    \
          |    ^~~~~~
    .../linux/include/linux/compiler_types.h:352:2: note: in expansion of macro ‘_compiletime_assert’
      352 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
          |  ^~~~~~~~~~~~~~~~~~~
    .../linux/include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
       39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
          |                                     ^~~~~~~~~~~~~~~~~~
    .../linux/include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
       59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
          |                     ^~~~~~~~~~~~~~~~
    .../linux/include/linux/huge_mm.h:351:2: note: in expansion of macro ‘BUILD_BUG’
      351 |  BUILD_BUG();
          |  ^~~~~~~~~

This commit fixes the issue by replacing the check to use
'folio_test_transhuge()'.

Fixes: 22bf1b68e572 ("vmscan: remove remaining uses of page in shrink_page_list")
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 40cda196d802..5a0f081a7be5 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1714,7 +1714,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
 					goto keep_locked;
 				if (folio_maybe_dma_pinned(folio))
 					goto keep_locked;
-				if (folio_test_large(folio)) {
+				if (folio_test_transhuge(folio)) {
 					/* cannot split folio, skip it */
 					if (!can_split_folio(folio, NULL))
 						goto activate_locked;
-- 
2.25.1