From 395576807555fa9ffb2ae038cae1fe2699f85b89 Mon Sep 17 00:00:00 2001
From: Brett Holman <bholman.devel@gmail.com>
Date: Tue, 12 Oct 2021 21:11:25 -0600
Subject: [PATCH] bcachefs: Add a valgrind memcheck hint

Prevent false positives in bch2_varint_decode_fast()

Signed-off-by: Brett Holman <bholman.devel@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 fs/bcachefs/varint.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/bcachefs/varint.c b/fs/bcachefs/varint.c
index e87da470c5812..5143b603bf67f 100644
--- a/fs/bcachefs/varint.c
+++ b/fs/bcachefs/varint.c
@@ -5,6 +5,10 @@
 #include <linux/string.h>
 #include <asm/unaligned.h>
 
+#ifdef CONFIG_VALGRIND
+#include <valgrind/memcheck.h>
+#endif
+
 #include "varint.h"
 
 /**
@@ -96,6 +100,9 @@ int bch2_varint_encode_fast(u8 *out, u64 v)
  */
 int bch2_varint_decode_fast(const u8 *in, const u8 *end, u64 *out)
 {
+#ifdef CONFIG_VALGRIND
+	VALGRIND_MAKE_MEM_DEFINED(in, 8);
+#endif
 	u64 v = get_unaligned_le64(in);
 	unsigned bytes = ffz(*in) + 1;
 
-- 
2.30.2