arm64: mm: replace TIF_LAZY_MMU with is_lazy_mmu_mode_active()

The generic lazy_mmu layer now tracks whether a task is in lazy MMU mode.
As a result we no longer need a TIF flag for that purpose - let's use the
new is_lazy_mmu_mode_active() helper instead.

The explicit check for in_interrupt() is no longer necessary either as
is_lazy_mmu_mode_active() always returns false in interrupt context.

Link: https://lkml.kernel.org/r/20251215150323.2218608-11-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Juegren Gross <jgross@suse.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7f528c36d53c120cf521421e19ea4d752ed8b8ec..445e18e92221c98eef717888aeac71d1d6b1da06 100644 (file)
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -62,28 +62,16 @@ static inline void emit_pte_barriers(void)
 
 static inline void queue_pte_barriers(void)
 {
-       unsigned long flags;
-
-       if (in_interrupt()) {
-               emit_pte_barriers();
-               return;
-       }
-
-       flags = read_thread_flags();
-
-       if (flags & BIT(TIF_LAZY_MMU)) {
+       if (is_lazy_mmu_mode_active()) {
                /* Avoid the atomic op if already set. */
-               if (!(flags & BIT(TIF_LAZY_MMU_PENDING)))
+               if (!test_thread_flag(TIF_LAZY_MMU_PENDING))
                        set_thread_flag(TIF_LAZY_MMU_PENDING);
        } else {
                emit_pte_barriers();
        }
 }
 
-static inline void arch_enter_lazy_mmu_mode(void)
-{
-       set_thread_flag(TIF_LAZY_MMU);
-}
+static inline void arch_enter_lazy_mmu_mode(void) {}
 
 static inline void arch_flush_lazy_mmu_mode(void)
 {
@@ -94,7 +82,6 @@ static inline void arch_flush_lazy_mmu_mode(void)
 static inline void arch_leave_lazy_mmu_mode(void)
 {
        arch_flush_lazy_mmu_mode();
-       clear_thread_flag(TIF_LAZY_MMU);
 }
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index a803b887b0b4771dab49631b9c46fbe378179d43..e7cd017b07c824c6adb47d3f37557c58f55e5c5e 100644 (file)
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -84,8 +84,7 @@ void arch_setup_new_exec(void);
 #define TIF_SME_VL_INHERIT     28      /* Inherit SME vl_onexec across exec */
 #define TIF_KERNEL_FPSTATE     29      /* Task is in a kernel mode FPSIMD section */
 #define TIF_TSC_SIGSEGV                30      /* SIGSEGV on counter-timer access */
-#define TIF_LAZY_MMU           31      /* Task in lazy mmu mode */
-#define TIF_LAZY_MMU_PENDING   32      /* Ops pending for lazy mmu mode exit */
+#define TIF_LAZY_MMU_PENDING   31      /* Ops pending for lazy mmu mode exit */
 
 #define _TIF_SIGPENDING                (1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED      (1 << TIF_NEED_RESCHED)