linux-kernel - [PATCH v4 28/30] x86/tlb: Make __flush_tlb

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Message-ID: <20250114175143.81438-29-vschneid@redhat.com>
Date: Tue, 14 Jan 2025 18:51:41 +0100
From: Valentin Schneider <vschneid@...hat.com>
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Subject: [PATCH v4 28/30] x86/tlb: Make __flush_tlb_all() noinstr

Later patches will require issuing a __flush_tlb_all() from noinstr code.
Both __flush_tlb_local() and __flush_tlb_global() are now
noinstr-compliant, so __flush_tlb_all() can be made noinstr itself.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
---
 arch/x86/include/asm/tlbflush.h | 2 +-
 arch/x86/mm/tlb.c               | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 69e79fff41b80..4d11396250999 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -17,7 +17,7 @@
 
 DECLARE_PER_CPU(u64, tlbstate_untag_mask);
 
-void __flush_tlb_all(void);
+noinstr void __flush_tlb_all(void);
 
 #define TLB_FLUSH_ALL	-1UL
 #define TLB_GENERATION_INVALID	0
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 18b40bbc2fa15..119765772ab11 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1229,7 +1229,7 @@ void flush_tlb_local(void)
 /*
  * Flush everything
  */
-void __flush_tlb_all(void)
+noinstr void __flush_tlb_all(void)
 {
 	/*
 	 * This is to catch users with enabled preemption and the PGE feature
@@ -1243,7 +1243,7 @@ void __flush_tlb_all(void)
 		/*
 		 * !PGE -> !PCID (setup_pcid()), thus every flush is total.
 		 */
-		flush_tlb_local();
+		__flush_tlb_local();
 	}
 }
 EXPORT_SYMBOL_GPL(__flush_tlb_all);
-- 
2.43.0