[PATCH v6 03/14] powerpc/mm: implement arch_flush_lazy_mmu_mode()

Kevin Brodsky
2025-12-15T15:03:54Z

Upcoming changes to the lazy_mmu API will cause
arch_flush_lazy_mmu_mode() to be called when leaving a nested
lazy_mmu section.

Move the relevant logic from arch_leave_lazy_mmu_mode() to
arch_flush_lazy_mmu_mode() and have the former call the latter. The
radix_enabled() check is required in both as
arch_flush_lazy_mmu_mode() will be called directly from the generic
layer in a subsequent patch.

Note: the additional this_cpu_ptr() and radix_enabled() calls on the
arch_leave_lazy_mmu_mode() path will be removed in a subsequent
patch.

Acked-by: David Hildenbrand <david@redhat.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
---
.../powerpc/include/asm/book3s/64/tlbflush-hash.h | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
index 146287d9580f..2d45f57df169 100644
--- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
@@ -41,7 +41,7 @@ static inline void arch_enter_lazy_mmu_mode(void)
batch->active = 1;
}

-static inline void arch_leave_lazy_mmu_mode(void)
+static inline void arch_flush_lazy_mmu_mode(void)
{
struct ppc64_tlb_batch *batch;

@@ -51,12 +51,21 @@ static inline void arch_leave_lazy_mmu_mode(void)

if (batch->index)
__flush_tlb_pending(batch);
+}
+
+static inline void arch_leave_lazy_mmu_mode(void)
+{
+ struct ppc64_tlb_batch *batch;
+
+ if (radix_enabled())
+ return;
+ batch = this_cpu_ptr(&ppc64_tlb_batch);
+
+ arch_flush_lazy_mmu_mode();
batch->active = 0;
preempt_enable();
}

-#define arch_flush_lazy_mmu_mode() do {} while (0)
-
extern void hash__tlbiel_all(unsigned int action);

extern void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize,
--
2.51.2