linux-kernel - [PATCH] mm: Elide a warning when casting void* -> enum

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Message-Id: <20200227211741.83165-1-palmer@dabbelt.com>
Date:   Thu, 27 Feb 2020 13:17:41 -0800
From:   Palmer Dabbelt <palmer@...belt.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH] mm: Elide a warning when casting void* -> enum

From: Palmer Dabbelt <palmerdabbelt@...gle.com>

I recently build the RISC-V port with LLVM trunk, which has introduced a
new warning when casting from a pointer to an enum of a smaller size.
This patch simply casts to a long in the middle to stop the warning.
I'd be surprised this is the only one in the kernel, but it's the only
one I saw.

Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
 mm/rmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index b3e381919835..b15e9edde2ac 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1376,7 +1376,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 	struct page *subpage;
 	bool ret = true;
 	struct mmu_notifier_range range;
-	enum ttu_flags flags = (enum ttu_flags)arg;
+	enum ttu_flags flags = (enum ttu_flags)(long)arg;
 
 	/* munlock has nothing to gain from examining un-locked vmas */
 	if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED))
-- 
2.25.1.481.gfbce0eb801-goog