linux-kernel - [PATCH mm-stable 2/2] x86/mm: always pass NULL as the first argument of switch_mm_irqs

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Date: Thu, 22 Feb 2024 19:09:11 +0000
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dave Hansen <dave.hansen@...el.com>, Ingo Molnar <mingo@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH mm-stable 2/2] x86/mm: always pass NULL as the first argument
 of switch_mm_irqs_off()

The first argument of switch_mm_irqs_off() is unused by the x86
implementation. Make sure that x86 code never passes a non-NULL value to
make this clear. Update the only non violating caller, switch_mm().

Suggested-by: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 arch/x86/mm/tlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index b67545baf6973..51f9f56941058 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -327,7 +327,7 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	unsigned long flags;
 
 	local_irq_save(flags);
-	switch_mm_irqs_off(prev, next, tsk);
+	switch_mm_irqs_off(NULL, next, tsk);
 	local_irq_restore(flags);
 }
 
-- 
2.44.0.rc1.240.g4c46232300-goog