linux-kernel - [PATCH] mm/thp: Rename TRANSPARENT_HUGEPAGE_NEVER_DAX to

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Date:   Wed, 15 Mar 2023 13:16:42 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>, peterx@...hat.com,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>
Subject: [PATCH] mm/thp: Rename TRANSPARENT_HUGEPAGE_NEVER_DAX to _UNSUPPORTED

TRANSPARENT_HUGEPAGE_NEVER_DAX has nothing to do with DAX.  It's set when
has_transparent_hugepage() returns false, checked in hugepage_vma_check()
and will disable THP completely if false.  Rename it to reflect its real
purpose.

Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Cc: Yang Shi <shy828301@...il.com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 include/linux/huge_mm.h | 2 +-
 mm/huge_memory.c        | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 70bd867eba94..9a3a3af2dd80 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -79,7 +79,7 @@ static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
 }
 
 enum transparent_hugepage_flag {
-	TRANSPARENT_HUGEPAGE_NEVER_DAX,
+	TRANSPARENT_HUGEPAGE_UNSUPPORTED,
 	TRANSPARENT_HUGEPAGE_FLAG,
 	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
 	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b0ab247939e0..913e7dc32869 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -88,7 +88,7 @@ bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags,
 	/*
 	 * If the hardware/firmware marked hugepage support disabled.
 	 */
-	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
+	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_UNSUPPORTED))
 		return false;
 
 	/* khugepaged doesn't collapse DAX vma, but page fault is fine. */
@@ -464,7 +464,7 @@ static int __init hugepage_init(void)
 		 * Hardware doesn't support hugepages, hence disable
 		 * DAX PMD support.
 		 */
-		transparent_hugepage_flags = 1 << TRANSPARENT_HUGEPAGE_NEVER_DAX;
+		transparent_hugepage_flags = 1 << TRANSPARENT_HUGEPAGE_UNSUPPORTED;
 		return -EINVAL;
 	}
 
-- 
2.39.1