linux-kernel - [PATCH] mm/shmem: restore setting of page variable

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Message-Id: <20220509123232.3428667-1-trix@redhat.com>
Date:   Mon,  9 May 2022 08:32:32 -0400
From:   Tom Rix <trix@...hat.com>
To:     hughd@...gle.com, akpm@...ux-foundation.org, nathan@...nel.org,
        ndesaulniers@...gle.com, willy@...radead.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] mm/shmem: restore setting of page variable

The clang build fails with
mm/shmem.c:2337:8: error: variable 'page' is uninitialized when used here [-Werror,-Wuninitialized]
  if (!page)
       ^~~~

In the commit listed in the fixes, there was a change to the
from
  page = shmem_alloc_page(..);
to
  page = &shmem_alloc_folio(..)->page;
But in this case, instead of replacing, the setting of page was
deleted.  So restore page with its new api.

Fixes: b0bb08b2d5f3 ("mm/shmem: turn shmem_alloc_page() into shmem_alloc_folio()")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 mm/shmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 7faaa61ff7fa..a2234f19b711 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2334,6 +2334,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
 
 	if (!*pagep) {
 		ret = -ENOMEM;
+		page = &shmem_alloc_folio(gfp, info, pgoff)->page;
 		if (!page)
 			goto out_unacct_blocks;
 
-- 
2.27.0