From 198e79f0e8f0b24c1e36ab6032d348f40de20262 Mon Sep 17 00:00:00 2001
From: Dominik Sliwa <dominik.sliwa@toradex.com>
Date: Fri, 22 Dec 2017 12:07:34 +0000
Subject: backports: bluetooth: Support 4.9 kernels

Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>
---
 compat/backport-4.0.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'compat/backport-4.0.c')

diff --git a/compat/backport-4.0.c b/compat/backport-4.0.c
index eb95082..7f86c69 100644
--- a/compat/backport-4.0.c
+++ b/compat/backport-4.0.c
@@ -17,6 +17,7 @@
 #include <linux/trace_seq.h>
 #include <linux/ftrace_event.h>
 #include <asm/unaligned.h>
+#include <linux/slab.h>
 
 static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
 						struct mm_struct *mm,
@@ -375,3 +376,35 @@ ftrace_print_array_seq(struct trace_seq *p, const void *buf, int buf_len,
 	return ret;
 }
 EXPORT_SYMBOL(ftrace_print_array_seq);
+
+/**
+ * kfree_const - conditionally free memory
+ * @x: pointer to the memory
+ *
+ * Function calls kfree only if @x is not in .rodata section.
+ */
+void kfree_const(const void *x)
+{
+	/* if (!is_kernel_rodata((unsigned long)x)) */
+		kfree(x);
+}
+EXPORT_SYMBOL(kfree_const);
+
+/*
+* kstrdup_const - conditionally duplicate an existing const string
+* @s: the string to duplicate
+* @gfp: the GFP mask used in the kmalloc() call when allocating memory
+*
+* Function returns source string if it is in .rodata section otherwise it
+* fallbacks to kstrdup.
+* Strings allocated by kstrdup_const should be freed by kfree_const.
+*/
+
+const char *kstrdup_const(const char *s, gfp_t gfp)
+{
+/*       if (is_kernel_rodata((unsigned long)s))
+ *             return s;
+ */
+       return kstrdup(s, gfp);
+}
+EXPORT_SYMBOL(kstrdup_const);
-- 
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