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

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Date:   Fri, 16 Jun 2023 09:02:04 -0000
From:   "tip-bot2 for Borislav Petkov (AMD)" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Borislav Petkov (AMD)" <bp@...en8.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/cleanups] x86/mm: Remove unused current_untag_mask()

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     013fdeb07a8fd32bbb3412e5f49d60207a78bf08
Gitweb:        https://git.kernel.org/tip/013fdeb07a8fd32bbb3412e5f49d60207a78bf08
Author:        Borislav Petkov (AMD) <bp@...en8.de>
AuthorDate:    Wed, 14 Jun 2023 19:41:48 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Fri, 16 Jun 2023 10:50:16 +02:00

x86/mm: Remove unused current_untag_mask()

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>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Link: https://lore.kernel.org/r/20230614174148.5439-1-bp@alien8.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 75bfaa4..80450e1 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