linux-kernel - [PATCH] mm: shmem: mark expected switch fall-through

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Date:   Fri, 20 Oct 2017 14:10:58 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] mm: shmem: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
This code was tested by compilation only (GCC 7.2.0 was used).
Please, verify if the actual intention of the code is to fall through.

 mm/shmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 9a981f0..fc6f3fd 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4098,6 +4098,7 @@ bool shmem_huge_enabled(struct vm_area_struct *vma)
 			if (i_size >= HPAGE_PMD_SIZE &&
 					i_size >> PAGE_SHIFT >= off)
 				return true;
+			/* fall through */
 		case SHMEM_HUGE_ADVISE:
 			/* TODO: implement fadvise() hints */
 			return (vma->vm_flags & VM_HUGEPAGE);
-- 
2.7.4