Subject: [PATCH v2 10/11] powerpc/book3s_64: Enables counting method to monitor lockless pgtbl walk

From: Leonardo Bras <[email-masked]>
Date: Fri, 20 Sep 2019 16:50:46 -0300

Enables count-based monitoring method for lockless pagetable walks on
PowerPC book3s_64.

Other architectures/platforms fallback to using generic dummy functions.

Signed-off-by: Leonardo Bras <[email-masked]>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 06a6a5344770..7a8813dfaee9 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1391,5 +1391,10 @@ static inline bool pgd_is_leaf(pgd_t pgd)
 	return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE));
 }
 
+#define __HAVE_ARCH_LOCKLESS_PGTBL_WALK_COUNTER
+void start_lockless_pgtbl_walk(struct mm_struct *mm);
+void end_lockless_pgtbl_walk(struct mm_struct *mm);
+int running_lockless_pgtbl_walk(struct mm_struct *mm);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */
-- 
2.20.1