linux-kernel - [PATCH 49/64] arch/xtensa: use mm locking wrappers

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Date:   Mon,  5 Feb 2018 02:27:39 +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 49/64] arch/xtensa: 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/xtensa/mm/fault.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c
index 6f8e3e7cccb5..5e783e5583b6 100644
--- a/arch/xtensa/mm/fault.c
+++ b/arch/xtensa/mm/fault.c
@@ -75,7 +75,7 @@ void do_page_fault(struct pt_regs *regs)
 	if (user_mode(regs))
 		flags |= FAULT_FLAG_USER;
 retry:
-	down_read(&mm->mmap_sem);
+	mm_read_lock(mm, &mmrange);
 	vma = find_vma(mm, address);
 
 	if (!vma)
@@ -141,7 +141,7 @@ void do_page_fault(struct pt_regs *regs)
 		}
 	}
 
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
 	if (flags & VM_FAULT_MAJOR)
 		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
@@ -154,7 +154,7 @@ void do_page_fault(struct pt_regs *regs)
 	 * Fix it, but check if it's kernel or user first..
 	 */
 bad_area:
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 	if (user_mode(regs)) {
 		current->thread.bad_vaddr = address;
 		current->thread.error_code = is_write;
@@ -173,7 +173,7 @@ void do_page_fault(struct pt_regs *regs)
 	 * 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
@@ -181,7 +181,7 @@ void do_page_fault(struct pt_regs *regs)
 	return;
 
 do_sigbus:
-	up_read(&mm->mmap_sem);
+	mm_read_unlock(mm, &mmrange);
 
 	/* Send a sigbus, regardless of whether we were in kernel
 	 * or user mode.
-- 
2.13.6