[Kernel Build] Initrd not getting build out of source dir

[Greg KH]

On Sat, Sep 03, 2016 at 05:07:20PM -0700, Vipul Jain wrote:
> Hi Kernel Alias,
> 
> I downloaded latest kernel source from kernel.org and tried to build it
> at a directory outside source by giving O=<path option> but I noticed that
> initrd image is not getting build but if I execute make inside source
> things are fine.
> 
> [Build Kernel/Modules etc inside source]
> ~/linux-stable/> make
> ~/linux-stable/> make install
> ~/linux-stable/> make install_modules
> ~/linux-stable/> su -c "reboot -f"
> 
> everything works out fine and system gives me selection to boot from
> newly build kernel and system boots up without issues. But if I build as
> below I see system OOPS because no file system found for mount. Would
> like to know why?
> 
> [Build outside]
> ~/linux-stable/> make O=~/linux-build/
> ~/linux-stable/> cd ../linux-build/

Don't do that.

> ~/linux-stable/> make install

make O=~/linux-build install

> ~/linux-stable/> make install_modules

make O=~/linux-build install_modules

hope this helps,

greg k-h