The quilt patch titled Subject: fs/proc: add boot loader arguments as comment to /proc/bootconfig has been removed from the -mm tree. Its filename was fs-proc-add-boot-loader-arguments-as-comment-to-proc-bootconfig.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: "Paul E. McKenney" <paulmck@xxxxxxxxxx> Subject: fs/proc: add boot loader arguments as comment to /proc/bootconfig Date: Thu, 5 Oct 2023 10:17:46 -0700 In kernels built with CONFIG_BOOT_CONFIG_FORCE=y, /proc/cmdline will show all kernel boot parameters, both those supplied by the boot loader and those embedded in the kernel image. This works well for those who just want to see all of the kernel boot parameters, but is not helpful to those who need to see only those parameters supplied by the boot loader. This is especially important when these parameters are presented to the boot loader by automation that might gather them from diverse sources. It is also useful when booting the next kernel via kexec(), in which case it is necessary to supply only those kernel command-line arguments from the boot loader, and most definitely not those that were embedded into the current kernel. Therefore, add comments to /proc/bootconfig of the form: # Parameters from bootloader: # root=UUID=ac0f0548-a69d-43ca-a06b-7db01bcbd5ad ro quiet ... The second added line shows only those kernel boot parameters supplied by the boot loader. Link: https://lore.kernel.org/all/CAHk-=wjpVAW3iRq_bfKnVfs0ZtASh_aT67bQBG11b4W6niYVUw@xxxxxxxxxxxxxx/ Link: https://lore.kernel.org/all/20230731233130.424913-1-paulmck@xxxxxxxxxx/ Link: https://lkml.kernel.org/r/20231005171747.541123-2-paulmck@xxxxxxxxxx Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> Co-developed-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/bootconfig.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/proc/bootconfig.c~fs-proc-add-boot-loader-arguments-as-comment-to-proc-bootconfig +++ a/fs/proc/bootconfig.c @@ -62,6 +62,12 @@ static int __init copy_xbc_key_value_lis break; dst += ret; } + if (ret >= 0 && boot_command_line[0]) { + ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n", + boot_command_line); + if (ret > 0) + dst += ret; + } } out: kfree(key); _ Patches currently in -mm which might be from paulmck@xxxxxxxxxx are