linux-kernel - [PATCH 1/2] x86/mm: delete unused cpu argument to leave

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date: Fri, 26 Jan 2024 08:06:43 +0000
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Ingo Molnar <mingo@...hat.com>
Cc: 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>, Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH 1/2] x86/mm: delete unused cpu argument to leave_mm()

The argument is unused since commit 3d28ebceaffa ("x86/mm: Rework lazy
TLB to track the actual loaded mm"), delete it.

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 arch/x86/include/asm/mmu.h    | 2 +-
 arch/x86/kernel/alternative.c | 2 +-
 arch/x86/mm/tlb.c             | 2 +-
 arch/x86/xen/mmu_pv.c         | 2 +-
 drivers/cpuidle/cpuidle.c     | 2 +-
 include/linux/mmu_context.h   | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h
index 0da5c227f490c..ce4677b8b7356 100644
--- a/arch/x86/include/asm/mmu.h
+++ b/arch/x86/include/asm/mmu.h
@@ -75,7 +75,7 @@ typedef struct {
 		.lock = __MUTEX_INITIALIZER(mm.context.lock),		\
 	}
 
-void leave_mm(int cpu);
+void leave_mm(void);
 #define leave_mm leave_mm
 
 #endif /* _ASM_X86_MMU_H */
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index cc130b57542ac..66bd265c7a587 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1805,7 +1805,7 @@ static inline temp_mm_state_t use_temporary_mm(struct mm_struct *mm)
 	 * restoring the previous mm.
 	 */
 	if (this_cpu_read(cpu_tlbstate_shared.is_lazy))
-		leave_mm(smp_processor_id());
+		leave_mm();
 
 	temp_state.mm = this_cpu_read(cpu_tlbstate.loaded_mm);
 	switch_mm_irqs_off(NULL, mm, current);
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 5768d386efab6..80b0caa82a91b 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -299,7 +299,7 @@ static void load_new_mm_cr3(pgd_t *pgdir, u16 new_asid, unsigned long lam,
 	write_cr3(new_mm_cr3);
 }
 
-void leave_mm(int cpu)
+void leave_mm(void)
 {
 	struct mm_struct *loaded_mm = this_cpu_read(cpu_tlbstate.loaded_mm);
 
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 72af496a160c8..218773cfb009f 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -913,7 +913,7 @@ static void drop_mm_ref_this_cpu(void *info)
 	struct mm_struct *mm = info;
 
 	if (this_cpu_read(cpu_tlbstate.loaded_mm) == mm)
-		leave_mm(smp_processor_id());
+		leave_mm();
 
 	/*
 	 * If this cpu still has a stale cr3 reference, then make sure
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 737a026ef58a3..02e40fd7d948c 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -237,7 +237,7 @@ noinstr int cpuidle_enter_state(struct cpuidle_device *dev,
 	}
 
 	if (target_state->flags & CPUIDLE_FLAG_TLB_FLUSHED)
-		leave_mm(dev->cpu);
+		leave_mm();
 
 	/* Take note of the planned idle state. */
 	sched_idle_set_state(target_state);
diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h
index f2b7a3f040999..bbaec80c78c50 100644
--- a/include/linux/mmu_context.h
+++ b/include/linux/mmu_context.h
@@ -11,7 +11,7 @@
 #endif
 
 #ifndef leave_mm
-static inline void leave_mm(int cpu) { }
+static inline void leave_mm(void) { }
 #endif
 
 /*
-- 
2.43.0.429.g432eaa2c6b-goog