linux-kernel - [PATCH] x86/mm: Remove unused current_untag

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Date:   Wed, 14 Jun 2023 19:41:48 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/mm: Remove unused current_untag_mask()

From: "Borislav Petkov (AMD)" <bp@...en8.de>

e0bddc19ba95 ("x86/mm: Reduce untagged_addr() overhead for systems without LAM")

removed its only usage site so drop it.

Move the tlbstate_untag_mask up in the header and drop the ugly
ifdeffery as the unused declaration should be properly discarded.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 arch/x86/include/asm/tlbflush.h | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 75bfaa421030..80450e1d5385 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -14,6 +14,8 @@
 #include <asm/processor-flags.h>
 #include <asm/pgtable.h>
 
+DECLARE_PER_CPU(u64, tlbstate_untag_mask);
+
 void __flush_tlb_all(void);
 
 #define TLB_FLUSH_ALL	-1UL
@@ -54,15 +56,6 @@ static inline void cr4_clear_bits(unsigned long mask)
 	local_irq_restore(flags);
 }
 
-#ifdef CONFIG_ADDRESS_MASKING
-DECLARE_PER_CPU(u64, tlbstate_untag_mask);
-
-static inline u64 current_untag_mask(void)
-{
-	return this_cpu_read(tlbstate_untag_mask);
-}
-#endif
-
 #ifndef MODULE
 /*
  * 6 because 6 should be plenty and struct tlb_state will fit in two cache
-- 
2.35.1