linux-kernel - [PATCH 50/64] arch/unicore32: use mm locking wrappers

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Date:   Mon,  5 Feb 2018 02:27:40 +0100
From:   Davidlohr Bueso <dbueso@...e.de>
To:     akpm@...ux-foundation.org, mingo@...nel.org
Cc:     peterz@...radead.org, ldufour@...ux.vnet.ibm.com, jack@...e.cz,
        mhocko@...nel.org, kirill.shutemov@...ux.intel.com,
        mawilcox@...rosoft.com, mgorman@...hsingularity.net,
        dave@...olabs.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 50/64] arch/unicore32: use mm locking wrappers

From: Davidlohr Bueso <dave@...olabs.net>

This becomes quite straightforward with the mmrange in place.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 arch/unicore32/mm/fault.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/unicore32/mm/fault.c b/arch/unicore32/mm/fault.c
index dd35b6191798..f806ade79afd 100644
--- a/arch/unicore32/mm/fault.c
+++ b/arch/unicore32/mm/fault.c
@@ -233,12 +233,12 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 	 * validly references user space from well defined areas of the code,
 	 * we can bug out early if this is from code which shouldn't.
 	 */
-	if (!down_read_trylock(&mm->mmap_sem)) {
+	if (!mm_read_trylock(mm, &mmrange)) {
 		if (!user_mode(regs)
 		    && !search_exception_tables(regs->UCreg_pc))
 			goto no_context;
 retry:
-		down_read(&mm->mmap_sem);
+		mm_read_lock(mm, &mmrange);
 	} else {
 		/*
 		 * The above down_read_trylock() might have succeeded in
@@ -275,7 +275,7 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 		}
 	}
 
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 
 	/*
 	 * Handle the "normal" case first - VM_FAULT_MAJOR
-- 
2.13.6