linux-kernel - [RFC PATCH V2 05/10] arm64: Re-factor flush_ptrace

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Date:	Thu, 18 Jun 2015 09:28:52 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	catalin.marinas@....com, will.deacon@....com
Cc:	linux-kernel@...r.kernel.org, wcohen@...hat.com, oleg@...hat.com,
	dave.long@...aro.org, steve.capper@...aro.org,
	srikar@...ux.vnet.ibm.com, vijaya.kumar@...iumnetworks.com,
	Pratyush Anand <panand@...hat.com>
Subject: [RFC PATCH V2 05/10] arm64: Re-factor flush_ptrace_access

Re-factor flush_ptrace_access to reuse vma independent part, which is
needed for functions like arch_uprobe_copy_ixol where we do not have
a vma.

Signed-off-by: Pratyush Anand <panand@...hat.com>
---
 arch/arm64/mm/flush.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index b6f14e8d2121..9a4dd6f39cfb 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -34,19 +34,25 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 		__flush_icache_all();
 }
 
+static void __flush_ptrace_access(struct page *page, unsigned long uaddr,
+		void *kaddr, unsigned long len)
+{
+	unsigned long addr = (unsigned long)kaddr;
+
+	if (icache_is_aliasing()) {
+		__flush_dcache_area(kaddr, len);
+		__flush_icache_all();
+	} else {
+		flush_icache_range(addr, addr + len);
+	}
+}
+
 static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 				unsigned long uaddr, void *kaddr,
 				unsigned long len)
 {
-	if (vma->vm_flags & VM_EXEC) {
-		unsigned long addr = (unsigned long)kaddr;
-		if (icache_is_aliasing()) {
-			__flush_dcache_area(kaddr, len);
-			__flush_icache_all();
-		} else {
-			flush_icache_range(addr, addr + len);
-		}
-	}
+	if (vma->vm_flags & VM_EXEC)
+		__flush_ptrace_access(page, uaddr, kaddr, len);
 }
 
 /*
-- 
2.1.0

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