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13610aa908
This slightly optimizes the kernel/configs.c build. bin2c is not very efficient because it converts a data file into a huge array to embed it into a *.c file. Instead, we can use the .incbin directive. Also, this simplifies the code; Makefile is cleaner, and the way to get the offset/size of the config_data.gz is more straightforward. I used the "asm" statement in *.c instead of splitting it into *.S because MODULE_* tags are not supported in *.S files. I also cleaned up kernel/.gitignore; "config_data.gz" is unneeded because the top-level .gitignore takes care of the "*.gz" pattern. [yamada.masahiro@socionext.com: v2] Link: http://lkml.kernel.org/r/1550108893-21226-1-git-send-email-yamada.masahiro@socionext.com Link: http://lkml.kernel.org/r/1549941160-8084-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alexander Popov <alex.popov@linux.com> Cc: Kees Cook <keescook@chromium.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* kernel/configs.c
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* Echo the kernel .config file used to build the kernel
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*
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* Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
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* Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
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* Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
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* Copyright (C) 2002 Hewlett-Packard Company
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/uaccess.h>
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/*
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* "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
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* a binary kernel image or a module. See scripts/extract-ikconfig.
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*/
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asm (
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" .pushsection .rodata, \"a\" \n"
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" .ascii \"IKCFG_ST\" \n"
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" .global kernel_config_data \n"
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"kernel_config_data: \n"
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" .incbin \"kernel/config_data.gz\" \n"
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" .global kernel_config_data_end \n"
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"kernel_config_data_end: \n"
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" .ascii \"IKCFG_ED\" \n"
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" .popsection \n"
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);
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#ifdef CONFIG_IKCONFIG_PROC
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extern char kernel_config_data;
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extern char kernel_config_data_end;
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static ssize_t
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ikconfig_read_current(struct file *file, char __user *buf,
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size_t len, loff_t * offset)
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{
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return simple_read_from_buffer(buf, len, offset,
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&kernel_config_data,
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&kernel_config_data_end -
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&kernel_config_data);
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}
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static const struct file_operations ikconfig_file_ops = {
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.owner = THIS_MODULE,
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.read = ikconfig_read_current,
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.llseek = default_llseek,
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};
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static int __init ikconfig_init(void)
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{
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struct proc_dir_entry *entry;
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/* create the current config file */
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entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
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&ikconfig_file_ops);
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if (!entry)
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return -ENOMEM;
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proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
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return 0;
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}
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static void __exit ikconfig_cleanup(void)
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{
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remove_proc_entry("config.gz", NULL);
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}
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module_init(ikconfig_init);
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module_exit(ikconfig_cleanup);
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#endif /* CONFIG_IKCONFIG_PROC */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Randy Dunlap");
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MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
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