From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Date: Fri, 1 Jun 2012 09:19:50 +0000 (+0530)
Subject: uprobes: Remove redundant lock_page/unlock_page
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=61e1d394984110e2e76f25572d5b1b5d48796751;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

uprobes: Remove redundant lock_page/unlock_page

Since read_opcode() reads from the referenced page and doesnt modify
the page contents nor the page attributes, there is no need to lock
the page.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index c08a22d02f72..7cff24c60dd7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -280,12 +280,10 @@ static int read_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_
 	if (ret <= 0)
 		return ret;
 
-	lock_page(page);
 	vaddr_new = kmap_atomic(page);
 	vaddr &= ~PAGE_MASK;
 	memcpy(opcode, vaddr_new + vaddr, UPROBE_SWBP_INSN_SIZE);
 	kunmap_atomic(vaddr_new);
-	unlock_page(page);
 
 	put_page(page);