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SubjectRe: [PATCH] Add option to disable kernel compression
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Hello,

On Thursday 11 April 2013 13:08:08, Vineet Gupta wrote:
> On 04/09/2013 05:19 PM, Christian Ruppert wrote:
> > Until now, kernel compression can only be disabled by deselecting
> > HAVE_<compression> in the architecture Kconfig. However, some
> > users/platforms within the same architecture might want to use
> > compression while others might want to disable it.
> > This patch is a solution to the dilemma.
> >
> > Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
> > ---
> > init/Kconfig | 8 +++++++-
> > 1 files changed, 7 insertions(+), 1 deletions(-)
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 5341d72..0924c51 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -101,7 +101,6 @@ config HAVE_KERNEL_LZO
> > choice
> > prompt "Kernel compression mode"
> > default KERNEL_GZIP
> > - depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO
> > help
> > The linux kernel is a kind of self-extracting executable.
> > Several compression algorithms are available, which differ
> > @@ -120,6 +119,13 @@ choice
> >
> > If in doubt, select 'gzip'
> >
> > +config KERNEL_UNCOMPRESSED
> > + bool "No compression"
>
> > + help
> > + No compression at all. The kernel is huge but the compression and
> > + decompression times are zero.
> > + This is usually not what you want.
> > +
> > config KERNEL_GZIP
> > bool "Gzip"
> > depends on HAVE_KERNEL_GZIP
>
> FWIW, this is an issue for ARC port where one of our platforms runs on a very slow
> FPGA, hence doesn't want to spend time uncompressing the image - while others do
> want the gzip.
>
> Reviewed-by: Vineet Gupta <vgupta@synopsys.com>

Even some other platforms, e.g. ARM you want no compression, if you can effort the additional space, if you want to boot extremely fast.

Best regards,
Alexander



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