On 02/15/2019 08:24 PM, David Miller wrote:
> From: Hauke Mehrtens <hauke.mehrtens@xxxxxxxxx>
> Date: Fri, 15 Feb 2019 17:58:54 +0100
>
>> The features attribute is of type u64 and stored in the native endianes on
>> the system. The for_each_set_bit() macro takes a pointer to a 32 bit array
>> and goes over the bits in this area. On little Endian systems this also
>> works with an u64 as the most significant bit is on the highest address,
>> but on big endian the words are swapped. When we expect bit 15 here we get
>> bit 47 (15 + 32).
>>
>> This patch converts it more or less to its own for_each_set_bit()
>> implementation which works on 64 bit integers directly. This is then
>> completely in host endianness and should work like expected.
>>
>> Fixes: fd867d51f ("net/core: generic support for disabling netdev features down stack")
>> Cc: stable@xxxxxxxxxxxxxxx
>> Signed-off-by: Hauke Mehrtens <hauke.mehrtens@xxxxxxxxx>
>
> Applied and queued up for -stable.
>
> Please do not CC: stable for networking fixes, I handle -stable submissions
> myself manually and this is documented in the netdev FAQ.
>
This commit added a call to fls64(), but not the needed include.
This might break some uses I think.
I suggest the following fix :
diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index c50cedb65cf56fe7d722a5a321b714ed83f449a0..d3f61011f4346e4ea80b61f88bd24541dd006014 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -11,6 +11,7 @@
#define _LINUX_NETDEV_FEATURES_H
#include <linux/types.h>
+#include <linux/bitops.h>
#include <asm/byteorder.h>
typedef u64 netdev_features_t;
