On Thu, Feb 25, 2021 at 12:14:45PM +0100, Arnd Bergmann wrote:
From: Arnd Bergmann <arnd@xxxxxxxx> While experimenting with CONFIG_TRIM_UNUSED_KSYMS across architectures, I noticed that this unsurprisingly works best when combined with the --gc-sections linker flag, which is not currently allowed on m68k. Enabling it with this patch shows significant improvements for kernel size, looking at m68k defconfig with gcc-10, I get 4005135 1374302 167108 5546545 54a231 vmlinux-normal 3916254 1378078 167108 5461440 5355c0 vmlinux+trim 4012933 1362514 164280 5539727 54878f vmlinux+gcsection 3797884 1334194 164640 5296718 50d24e vmlinux+gcsection+trim There are probably bugs somewhere, but if someone is able to test this patch and fix any issues that come up, would be a useful improvement for memory-limited machines. Link: https://lore.kernel.org/lkml/CAK8P3a05VZ9hSKRzVTxTn+1nf9E+gqebJWTj6N23nfm+ELHt9A@xxxxxxxxxxxxxx/ Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
