linux-kernel - [PATCH v2 1/8] mm/gup: perform check_dax_vmas only when FS

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Message-Id: <20201210004335.64634-2-pasha.tatashin@soleen.com>
Date:   Wed,  9 Dec 2020 19:43:28 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org, vbabka@...e.cz,
        mhocko@...e.com, david@...hat.com, osalvador@...e.de,
        dan.j.williams@...el.com, sashal@...nel.org,
        tyhicks@...ux.microsoft.com, iamjoonsoo.kim@....com,
        mike.kravetz@...cle.com, rostedt@...dmis.org, mingo@...hat.com,
        jgg@...pe.ca, peterz@...radead.org, mgorman@...e.de,
        willy@...radead.org, rientjes@...gle.com, jhubbard@...dia.com,
        linux-doc@...r.kernel.org
Subject: [PATCH v2 1/8] mm/gup: perform check_dax_vmas only when FS_DAX is enabled

There is no need to check_dax_vmas() and run through the npage loop of
pinned pages if FS_DAX is not enabled.

Add a stub check_dax_vmas() function for no-FS_DAX case.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
Reviewed-by: John Hubbard <jhubbard@...dia.com>
---
 mm/gup.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/gup.c b/mm/gup.c
index 98eb8e6d2609..cdb8b9eeb016 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1568,6 +1568,7 @@ struct page *get_dump_page(unsigned long addr)
 #endif /* CONFIG_ELF_CORE */
 
 #if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
+#ifdef CONFIG_FS_DAX
 static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
 {
 	long i;
@@ -1586,6 +1587,12 @@ static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
 	}
 	return false;
 }
+#else
+static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
+{
+	return false;
+}
+#endif
 
 #ifdef CONFIG_CMA
 static long check_and_migrate_cma_pages(struct mm_struct *mm,
-- 
2.25.1