This patch is a part of a series that extends arm64 kernel ABI to allow to
pass tagged user pointers (with the top byte set to something else other
than 0x00) as syscall arguments.

seq_print_user_ip() uses provided user pointers for vma lookups, which
can only by done with untagged pointers.

Untag user pointers in this function.

Signed-off-by: Andrey Konovalov <redacted>
---
 kernel/trace/trace_output.c |  5 +++--
 p                           | 45 +++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 p

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 54373d93e251..6376bee93c84 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c

@@ -370,6 +370,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 {
 	struct file *file = NULL;
 	unsigned long vmstart = 0;
+	unsigned long untagged_ip = untagged_addr(ip);
 	int ret = 1;
 
 	if (s->full)

@@ -379,7 +380,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 		const struct vm_area_struct *vma;
 
 		down_read(&mm->mmap_sem);
-		vma = find_vma(mm, ip);
+		vma = find_vma(mm, untagged_ip);
 		if (vma) {
 			file = vma->vm_file;
 			vmstart = vma->vm_start;

@@ -388,7 +389,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 			ret = trace_seq_path(s, &file->f_path);
 			if (ret)
 				trace_seq_printf(s, "[+0x%lx]",
-						 ip - vmstart);
+						 untagged_ip - vmstart);
 		}
 		up_read(&mm->mmap_sem);
 	}

diff --git a/p b/p
new file mode 100644
index 000000000000..9d6fa5386e55
--- /dev/null
+++ b/p

@@ -0,0 +1,45 @@
+commit 1fa6fadf644859e8a6a8ecce258444b49be8c7ee
+Author: Andrey Konovalov <andreyknvl@google.com>
+Date:   Mon Mar 4 17:20:32 2019 +0100
+
+    kasan: fix coccinelle warnings in kasan_p*_table
+    
+    kasan_p4d_table, kasan_pmd_table and kasan_pud_table are declared as
+    returning bool, but return 0 instead of false, which produces a coccinelle
+    warning. Fix it.
+    
+    Fixes: 0207df4fa1a8 ("kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN")
+    Reported-by: kbuild test robot <lkp@intel.com>
+    Signed-off-by: Andrey Konovalov <andreyknvl@google.com>