linux-kernel - Re: [PATCH v7 00/10] livepatch: klp-convert tool

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Message-ID: <683593a8-79db-4f3b-bc78-7917284683e4@p183>
Date:   Thu, 30 Mar 2023 20:04:24 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Joe Lawrence <joe.lawrence@...hat.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: Re: [PATCH v7 00/10] livepatch: klp-convert tool

This patchset somehow breaks the build of the simplest livepatch module:

	make -f linux/linux-1/scripts/Makefile.modfinal
	make[1]: *** No rule to make target 'linux/module-klp/main.tmp.ko', needed by 'linux/module-klp/main.ko'.  Stop.

$ cat Kbuild
obj-m := main.o

$ cat main.c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/livepatch.h>
#include <linux/seq_file.h>

static int livepatch_cmdline_proc_show(struct seq_file *m, void *data)
{
	seq_puts(m, "REDACTED 001\n");
	return 0;
}

static struct klp_func funcs[] = {
	{
		.old_name = "cmdline_proc_show",
		.new_func = livepatch_cmdline_proc_show,
	},
	{}
};

static struct klp_object objs[] = {
	{
		.funcs = funcs,
	},
	{}
};

static struct klp_patch g_patch = {
	.mod = THIS_MODULE,
	.objs = objs,
};

static int livepatch_init(void)
{
	return klp_enable_patch(&g_patch);
}

static void livepatch_exit(void)
{
}
module_init(livepatch_init);
module_exit(livepatch_exit);
MODULE_LICENSE("GPL");
MODULE_INFO(livepatch, "Y");