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
