linux-kernel - [PATCH] arm64/mm: Drop cpu_set_[default|idmap]_tcr

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Message-Id: <20251015021024.366722-1-anshuman.khandual@arm.com>
Date: Wed, 15 Oct 2025 03:10:24 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: ryan.roberts@....com,
	Anshuman Khandual <anshuman.khandual@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/mm: Drop cpu_set_[default|idmap]_tcr_t0sz()

These TCR_El1 helpers don't have any other callers. Drop these redundant
indirections completely thus making this code more compact and readable.
No functional change.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/include/asm/mmu_context.h | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index 1b4ac7b23e18..0375ca3162ff 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -61,11 +61,6 @@ static inline void cpu_switch_mm(pgd_t *pgd, struct mm_struct *mm)
 	cpu_do_switch_mm(virt_to_phys(pgd),mm);
 }
 
-/*
- * TCR.T0SZ value to use when the ID map is active.
- */
-#define idmap_t0sz	TCR_T0SZ(IDMAP_VA_BITS)
-
 /*
  * Ensure TCR.T0SZ is set to the provided value.
  */
@@ -82,9 +77,6 @@ static inline void __cpu_set_tcr_t0sz(unsigned long t0sz)
 	isb();
 }
 
-#define cpu_set_default_tcr_t0sz()	__cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual))
-#define cpu_set_idmap_tcr_t0sz()	__cpu_set_tcr_t0sz(idmap_t0sz)
-
 /*
  * Remove the idmap from TTBR0_EL1 and install the pgd of the active mm.
  *
@@ -103,7 +95,7 @@ static inline void cpu_uninstall_idmap(void)
 
 	cpu_set_reserved_ttbr0();
 	local_flush_tlb_all();
-	cpu_set_default_tcr_t0sz();
+	__cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual));
 
 	if (mm != &init_mm && !system_uses_ttbr0_pan())
 		cpu_switch_mm(mm->pgd, mm);
@@ -113,7 +105,7 @@ static inline void cpu_install_idmap(void)
 {
 	cpu_set_reserved_ttbr0();
 	local_flush_tlb_all();
-	cpu_set_idmap_tcr_t0sz();
+	__cpu_set_tcr_t0sz(TCR_T0SZ(IDMAP_VA_BITS));
 
 	cpu_switch_mm(lm_alias(idmap_pg_dir), &init_mm);
 }
-- 
2.30.2