[PATCH 2/5] arm64: gcs: Use the new common vm_mmap_shadow_stack() helper

[Catalin Marinas <catalin.marinas@arm.com>]

Replace the arm64 map_shadow_stack() content with a call to
vm_mmap_shadow_stack().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
---
 arch/arm64/mm/gcs.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/arch/arm64/mm/gcs.c b/arch/arm64/mm/gcs.c
index 04a23a497f20..680749611a9a 100644
--- a/arch/arm64/mm/gcs.c
+++ b/arch/arm64/mm/gcs.c
@@ -12,19 +12,7 @@
 
 static unsigned long alloc_gcs(unsigned long addr, unsigned long size)
 {
-	int flags = MAP_ANONYMOUS | MAP_PRIVATE;
-	struct mm_struct *mm = current->mm;
-	unsigned long mapped_addr, unused;
-
-	if (addr)
-		flags |= MAP_FIXED_NOREPLACE;
-
-	mmap_write_lock(mm);
-	mapped_addr = do_mmap(NULL, addr, size, PROT_READ, flags,
-			      VM_SHADOW_STACK | VM_WRITE, 0, &unused, NULL);
-	mmap_write_unlock(mm);
-
-	return mapped_addr;
+	return vm_mmap_shadow_stack(addr, size, 0);
 }
 
 static unsigned long gcs_size(unsigned long size)