linux-kernel - [PATCH] x86: define LOADED_MM_SWITCHING with pointer-sized number

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Message-Id: <20190328230939.15711-1-jannh@google.com>
Date:   Fri, 29 Mar 2019 00:09:39 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, jannh@...gle.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH] x86: define LOADED_MM_SWITCHING with pointer-sized number

sparse complains that LOADED_MM_SWITCHING's definition casts an int to a
pointer:

arch/x86/mm/tlb.c:409:17: warning: non size-preserving integer to pointer
cast

Use a pointer-sized integer constant instead.

Signed-off-by: Jann Horn <jannh@...gle.com>
---
 arch/x86/include/asm/tlbflush.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index f4204bf377fc..90926e8dd1f8 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -167,7 +167,7 @@ struct tlb_state {
 	 */
 	struct mm_struct *loaded_mm;
 
-#define LOADED_MM_SWITCHING ((struct mm_struct *)1)
+#define LOADED_MM_SWITCHING ((struct mm_struct *)1UL)
 
 	/* Last user mm for optimizing IBPB */
 	union {
-- 
2.21.0.392.gf8f6787159e-goog