On Monday 29 February 2016 13:58:13 Michal Marek wrote:

On 2016-02-29 13:40, Arnd Bergmann wrote:

quoted

When KERNEL_LZ4 is set, we always get an output even when building
with 'make -s':

    *** LZ4 Compression CLI , by Yann Collet (May 31 2013) ***
    ! Generating compressed LZ4 using Legacy format (deprecated !) !
    Using stdin for input
    Using stdout for output
    Compressed 11213376 bytes into 4555781 bytes ==> 40.63%
    Done in 0.63 s ==> 16.97 MB/s

The output is not helpful in the context of building the kernel,
so this patch hides the stdout output of the lz4 binary completely.

quoted

-     lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
+     lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ 2>&1 || \
      (rm -f $@ ; false)

Hi Arnd,

this redirection does not hide it, but rather includes it in the
compressed image file.

Oops, you are right. I was cleaning out some older patches I had in my
queue and hadn't realized it was completely botched this way.

BTW, my copy of lz4c only displays this warning with -v.

I've updated my copy of lz4c now and can confirm that the output
is completely gone (without -v). I won't follow up with a fixed version
then, as the problem is already solved elsewhere.

	Arnd