Hi, Russell, On Sun, May 1, 2022 at 2:35 PM Russell King (Oracle) <linux@xxxxxxxxxxxxxxx> wrote: > > On Sun, May 01, 2022 at 01:22:25PM +0800, Huacai Chen wrote: > > Hi, Arnd, > > > > On Sat, Apr 30, 2022 at 7:02 PM Arnd Bergmann <arnd@xxxxxxxx> wrote: > > > > > > On Sat, Apr 30, 2022 at 11:05 AM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote: > > > > > > > > This patch adds zboot (self-extracting compressed kernel) support, all > > > > existing in-kernel compressing algorithm and efistub are supported. > > > > > > > > Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx> > > > > > > I have no objections to adding a decompressor in principle, and > > > the implementation seems reasonable. However, I think we should try to > > > be consistent between architectures. On both arm64 and riscv, the > > > maintainers decided to not include a decompressor and instead leave > > > it up to the boot loader to decompress the kernel and enter it from there. > > X86, ARM32 and MIPS already support self-extracting kernel, and in > > 5.17 we even support self-extracting modules. So I think a > > self-extracting kernel is better than a pure compressed kernel. > > FYI, kernel modules are not self-extracting. They don't contain the code > to do the decompression - that is contained within the kernel, and it is > the kernel that does the decompression. The userspace tooling tells the > kernel that the module is compressed. I call "self-extracting" here means we don't need out-of-kernel help: kernel decompress doesn't need the bootloader, module decompress doesn't need kmod. Huacai > > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
