Subject: How was this kernel built?
From: Joseph A. Martin (jmartin@linux08.mro.dec.com)
Date: Thu Sep 09 1999 - 08:42:09 PDT
On Wed, Sep 08, 1999 at 04:31:37PM -0400, Eran Guendelman wrote:
> In general, how do I find out the options the kernel was compiled with,
> because if I have to recompile it I want to make sure I only change
> this specific setting.
Someone published a solution to this problem on the linux-kernel list
a few weeks ago. Unfortunately, it is a prospective solution rather
than a retrospective one: he proposed embedding the .config file in
the /proc file system.
I don't know if the idea was accepted and will appear soon or if it
was rejected/ignored. As it happens, the original author beat me by a
day to the same idea. Below are MY previously unpublished patches to
achieve the same effect.
\Joe Joseph A. Martin
Joseph.Martin@Compaq.com Compaq Computer Corporation
200 Forest Street MRO1-2/K20
(508) 467-2100 Marlboro, MA 01752 U.S.A.
diff -urp rth1-pre1-2.2.11/Documentation/Configure.help patch_CONFIGZ/Documentation/Configure.help
--- rth1-pre1-2.2.11/Documentation/Configure.help Tue Jun 29 13:58:39 1999
+++ patch_CONFIGZ/Documentation/Configure.help Wed Jul 14 17:52:14 1999
@@ -7092,6 +7092,17 @@ CONFIG_PROC_FS
This option will enlarge your kernel by about 18 KB. Several
programs depend on this, so everyone should say Y here.
+compressed configuration (/proc/.config.gz)
+CONFIG_PROC_CONFIGZ
+ A compressed version of the configuration file (.config) from which
+ the kernel was built is placed in the /proc filesystem. One can
+ think of this as the rest of /proc/version. Sample usage:
+ "gunzip - < /proc/.config.gz | more"
+
+ This option is useful for kernel developers and for users who need
+ to communicate their exact configuration to technical support. It
+ adds about 2 KB to the kernel.
+
NFS filesystem support
CONFIG_NFS_FS
If you are connected to some other (usually local) Unix computer
diff -urp rth1-pre1-2.2.11/fs/Config.in patch_CONFIGZ/fs/Config.in
--- rth1-pre1-2.2.11/fs/Config.in Tue Jun 29 13:58:42 1999
+++ patch_CONFIGZ/fs/Config.in Wed Jul 14 17:52:14 1999
@@ -34,6 +34,9 @@ if [ "$CONFIG_NTFS_FS" != "n" -a "$CONFI
fi
tristate 'OS/2 HPFS filesystem support (read only)' CONFIG_HPFS_FS
bool '/proc filesystem support' CONFIG_PROC_FS
+if [ "$CONFIG_PROC_FS" = "y" ]; then
+ bool ' compressed configuration (/proc/.config.gz)' CONFIG_PROC_CONFIGZ
+fi
if [ "$CONFIG_UNIX98_PTYS" = "y" ]; then
# It compiles as a module for testing only. It should not be used
# as a module in general. If we make this "tristate", a bunch of people
diff -urp rth1-pre1-2.2.11/fs/proc/Makefile patch_CONFIGZ/fs/proc/Makefile
--- rth1-pre1-2.2.11/fs/proc/Makefile Wed Jun 24 17:30:10 1998
+++ patch_CONFIGZ/fs/proc/Makefile Wed Jul 14 17:52:14 1999
@@ -29,3 +29,13 @@ O_OBJS += proc_devtree.o
endif
include $(TOPDIR)/Rules.make
+
+ifeq ($(CONFIG_PROC_CONFIGZ),y)
+array.o: configz.h
+
+configz.h: $(TOPDIR)/.config
+ @echo 'static const char configz_array[] = {' > .conf
+ @gzip -9 - < $(TOPDIR)/.config | od -An -t x1 | tr -s '\040' '\012' | \
+sed -e '/[0-9a-f][0-9a-f]/s/\(.*\)/0x\1,/' -e '$$s/,/};/' >> .conf
+ @mv -f .conf $@
+endif
diff -urp rth1-pre1-2.2.11/fs/proc/array.c patch_CONFIGZ/fs/proc/array.c
--- rth1-pre1-2.2.11/fs/proc/array.c Tue Jun 29 13:58:38 1999
+++ patch_CONFIGZ/fs/proc/array.c Wed Jul 14 17:52:14 1999
@@ -1242,6 +1242,20 @@ static int get_pidcpu(int pid, char * bu
}
#endif
+#ifdef CONFIG_PROC_CONFIGZ
+#include "configz.h"
+static int get_configz(char *buffer, char **start, off_t offset, off_t length)
+{
+ if (offset >= sizeof(configz_array))
+ return 0;
+ if (length + offset > sizeof(configz_array))
+ length = sizeof(configz_array) - offset;
+ memcpy(buffer, &configz_array[offset], length);
+ *start = buffer;
+ return length;
+}
+#endif
+
#ifdef CONFIG_MODULES
extern int get_module_list(char *);
extern int get_ksyms_list(char *, char **, off_t, int);
@@ -1351,6 +1365,10 @@ static long get_root_array(char * page,
#ifdef CONFIG_STRAM_PROC
case PROC_STRAM:
return get_stram_list(page);
+#endif
+#ifdef CONFIG_PROC_CONFIGZ
+ case PROC_CONFIGZ:
+ return get_configz(page, start, offset, length);
#endif
}
return -EBADF;
diff -urp rth1-pre1-2.2.11/fs/proc/root.c patch_CONFIGZ/fs/proc/root.c
--- rth1-pre1-2.2.11/fs/proc/root.c Thu Apr 29 12:50:46 1999
+++ patch_CONFIGZ/fs/proc/root.c Wed Jul 14 17:52:14 1999
@@ -668,6 +668,13 @@ static struct proc_dir_entry proc_root_p
NULL, NULL /* parent, subdir */
};
#endif
+#if CONFIG_PROC_CONFIGZ
+static struct proc_dir_entry proc_root_configz = {
+ PROC_CONFIGZ, 10, ".config.gz",
+ S_IFREG | S_IRUGO, 1, 0, 0,
+ 0, &proc_array_inode_operations
+};
+#endif
__initfunc(void proc_root_init(void))
{
@@ -737,6 +744,9 @@ __initfunc(void proc_root_init(void))
proc_tty_init();
#ifdef __powerpc__
proc_register(&proc_root, &proc_root_ppc_htab);
+#endif
+#if CONFIG_PROC_CONFIGZ
+ proc_register(&proc_root, &proc_root_configz);
#endif
#ifdef CONFIG_PROC_DEVICETREE
proc_device_tree_init();
diff -urp rth1-pre1-2.2.11/include/linux/proc_fs.h patch_CONFIGZ/include/linux/proc_fs.h
--- rth1-pre1-2.2.11/include/linux/proc_fs.h Fri Jul 9 16:55:57 1999
+++ patch_CONFIGZ/include/linux/proc_fs.h Thu Jul 15 11:12:18 1999
@@ -52,7 +52,8 @@ enum root_directory_inos {
PROC_STRAM,
PROC_SOUND,
PROC_MTRR, /* whether enabled or not */
- PROC_FS
+ PROC_FS,
+ PROC_CONFIGZ
};
enum pid_directory_inos {
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This archive was generated by hypermail 2a22 : Mon Oct 04 1999 - 12:44:51 PDT