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From:   Davidlohr Bueso <dbueso@suse.de>
To:     akpm@linux-foundation.org, mingo@kernel.org
Cc:     peterz@infradead.org, ldufour@linux.vnet.ibm.com, jack@suse.cz,
        mhocko@kernel.org, kirill.shutemov@linux.intel.com,
        mawilcox@microsoft.com, mgorman@techsingularity.net,
        dave@stgolabs.net, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Davidlohr Bueso <dbueso@suse.de>
Subject: [PATCH 47/64] arch/microblaze: use mm locking wrappers
Date:   Mon,  5 Feb 2018 02:27:37 +0100
Message-Id: <20180205012754.23615-48-dbueso@wotan.suse.de>
In-Reply-To: <20180205012754.23615-1-dbueso@wotan.suse.de>
References: <20180205012754.23615-1-dbueso@wotan.suse.de>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Davidlohr Bueso <dave@stgolabs.net>

This becomes quite straightforward with the mmrange in place.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
 arch/microblaze/mm/fault.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index fd49efbdfbf4..072e0d79aab5 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -139,12 +139,12 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * source.  If this is invalid we can skip the address space check,
 	 * thus avoiding the deadlock.
 	 */
-	if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
+	if (unlikely(!mm_read_trylock(mm, &mmrange))) {
 		if (kernel_mode(regs) && !search_exception_tables(regs->pc))
 			goto bad_area_nosemaphore;
 
 retry:
-		down_read(&mm->mmap_sem);
+		mm_read_lock(mm, &mmrange);
 	}
 
 	vma = find_vma(mm, address);
@@ -251,7 +251,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 		}
 	}
 
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 
 	/*
 	 * keep track of tlb+htab misses that are good addrs but
@@ -262,7 +262,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	return;
 
 bad_area:
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 
 bad_area_nosemaphore:
 	pte_errors++;
@@ -286,7 +286,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
  * us unable to handle the page fault gracefully.
  */
 out_of_memory:
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 	if (!user_mode(regs))
 		bad_page_fault(regs, address, SIGKILL);
 	else
@@ -294,7 +294,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	return;
 
 do_sigbus:
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 	if (user_mode(regs)) {
 		info.si_signo = SIGBUS;
 		info.si_errno = 0;
-- 
2.13.6