linux-kernel - [PATCH 03/22] arch/arc/kernel/troubleshoot: use vma_lookup() instead of find

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Date:   Mon, 10 May 2021 16:58:49 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <michel@...pinasse.org>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 03/22] arch/arc/kernel/troubleshoot: use vma_lookup() instead
 of find_vma()

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 arch/arc/kernel/troubleshoot.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index a331bb5d8319..7654c2e42dc0 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -83,12 +83,12 @@ static void show_faulting_vma(unsigned long address)
 	 * non-inclusive vma
 	 */
 	mmap_read_lock(active_mm);
-	vma = find_vma(active_mm, address);
+	vma = vma_lookup(active_mm, address);
 
-	/* check against the find_vma( ) behaviour which returns the next VMA
-	 * if the container VMA is not found
+	/* Lookup the vma at the address and report if the container VMA is not
+	 * found
 	 */
-	if (vma && (vma->vm_start <= address)) {
+	if (vma) {
 		char buf[ARC_PATH_MAX];
 		char *nm = "?";
 
-- 
2.30.2