+ mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch added to -mm tree

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The patch titled
     Subject: mm/thp: make ALLOC_SPLIT_PTLOCKS dependent on USE_SPLIT_PTE_PTLOCKS
has been added to the -mm tree.  Its filename is
     mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/thp: make ALLOC_SPLIT_PTLOCKS dependent on USE_SPLIT_PTE_PTLOCKS

Split ptlocks need not be defined and allocated unless they are being
used.  ALLOC_SPLIT_PTLOCKS is inherently dependent on
USE_SPLIT_PTE_PTLOCKS.  This just makes it explicit and clear.

Link: https://lkml.kernel.org/r/1620618390-9999-1-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 include/linux/mm_types_task.h |    5 +++++
 mm/memory.c                   |    2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

--- a/include/linux/mm_types_task.h~mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks
+++ a/include/linux/mm_types_task.h
@@ -22,7 +22,12 @@
 #define USE_SPLIT_PTE_PTLOCKS	(NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
 #define USE_SPLIT_PMD_PTLOCKS	(USE_SPLIT_PTE_PTLOCKS && \
 		IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
+
+#if USE_SPLIT_PTE_PTLOCKS
 #define ALLOC_SPLIT_PTLOCKS	(SPINLOCK_SIZE > BITS_PER_LONG/8)
+#else
+#define ALLOC_SPLIT_PTLOCKS	0
+#endif
 
 /*
  * The per task VMA cache array:
--- a/mm/memory.c~mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks
+++ a/mm/memory.c
@@ -5260,7 +5260,7 @@ long copy_huge_page_from_user(struct pag
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
 
-#if USE_SPLIT_PTE_PTLOCKS && ALLOC_SPLIT_PTLOCKS
+#if ALLOC_SPLIT_PTLOCKS
 
 static struct kmem_cache *page_ptl_cachep;
 
_

Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are

mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch




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