linux-kernel - [PATCH 3/5] mm/hmm: Use mm_get_hmm() in hmm_range

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Date:   Mon, 6 May 2019 16:29:40 -0700
From:   <rcampbell@...dia.com>
To:     <linux-mm@...ck.org>
CC:     <linux-kernel@...r.kernel.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Balbir Singh <bsingharora@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/5] mm/hmm: Use mm_get_hmm() in hmm_range_register()

From: Ralph Campbell <rcampbell@...dia.com>

In hmm_range_register(), the call to hmm_get_or_create() implies that
hmm_range_register() could be called before hmm_mirror_register() when
in fact, that would violate the HMM API.

Use mm_get_hmm() instead of hmm_get_or_create() to get the HMM structure.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Balbir Singh <bsingharora@...il.com>
Cc: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Souptick Joarder <jrdr.linux@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 mm/hmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index f6c4c8633db9..2aa75dbed04a 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -936,7 +936,7 @@ int hmm_range_register(struct hmm_range *range,
 	range->start = start;
 	range->end = end;
 
-	range->hmm = hmm_get_or_create(mm);
+	range->hmm = mm_get_hmm(mm);
 	if (!range->hmm)
 		return -EFAULT;
 
-- 
2.20.1