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Add the necessary parts to be enable the use of LZO-compressed initramfs
build into the kernel.
Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Tested-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Russell King <rmk@arm.linux.org.uk>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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On compilers with security warnings enabled by default, we get:
usr/gen_init_cpio.c: In function ‘cpio_mkfile’:
usr/gen_init_cpio.c:357: warning: ignoring return value of ‘fwrite’,
declared with attribute warn_unused_result
So check the return value and handle errors accordingly.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
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* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next: (30 commits)
Use macros for .data.page_aligned section.
Use macros for .bss.page_aligned section.
Use new __init_task_data macro in arch init_task.c files.
kbuild: Don't define ALIGN and ENTRY when preprocessing linker scripts.
arm, cris, mips, sparc, powerpc, um, xtensa: fix build with bash 4.0
kbuild: add static to prototypes
kbuild: fail build if recordmcount.pl fails
kbuild: set -fconserve-stack option for gcc 4.5
kbuild: echo the record_mcount command
gconfig: disable "typeahead find" search in treeviews
kbuild: fix cc1 options check to ensure we do not use -fPIC when compiling
checkincludes.pl: add option to remove duplicates in place
markup_oops: use modinfo to avoid confusion with underscored module names
checkincludes.pl: provide usage helper
checkincludes.pl: close file as soon as we're done with it
ctags: usability fix
kernel hacking: move STRIP_ASM_SYMS from General
gitignore usr/initramfs_data.cpio.bz2 and usr/initramfs_data.cpio.lzma
kbuild: Check if linker supports the -X option
kbuild: introduce ld-option
...
Fix trivial conflict in scripts/basic/fixdep.c
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Signed-off-by: Trevor Keith <tsrk@tsrk.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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usr/initramfs_data.cpio.bz2 and usr/initramfs_data.cpio.lzma are binary
files should be ignored
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Fix the Makefile comment since bzip2 is now supported.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Impact: quiet Kconfig warning
It appears that Kconfig simply has no way to provide defaults for
entries that exist inside a conditionalized choice block.
Fortunately, it turns out we don't actually ever use
CONFIG_INITRAMFS_COMPRESSION_NONE, so we can just drop it for
everything outside the choice block.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: Kconfig noise reduction, documentation
The default initramfs is so small that it makes no sense to worry
about the additional memory taken by not double-compressing it.
Therefore, don't bug the user with it.
Also, improve the description of the option, which was downright
incorrect.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: message formatting
Consistently spell LZMA in all capitals, since it (unlike gzip or
bzip2) is an acronym.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: Kconfig clarification
Make it clear that the CONFIG_RD_* options are about what formats are
supported, not about what formats are actually being used.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: reduce Kconfig noise
Move the options that control possible initramfs/initrd compressions
underneath CONFIG_EMBEDDED. The only impact of leaving these options
set to y is additional code in the init section of the kernel; there
is no reason to burden non-embedded users with these options.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: Avoids silent environment dependency
Make builtin initramfs compression an explicit configurable. The
previous version would pick a compression based on the binaries which
were installed on the system, which could lead to unexpected results.
It is now explicitly configured, and not having the appropriate
binaries installed on the build host is simply an error.
Signed-off-by: Alain Knaff <alain@knaff.lu>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Impact: Resolves build failures in some configurations
Makes it possible to disable CONFIG_RD_GZIP . In that case, the
built-in initramfs will be compressed by whatever compressor is
available (bzip2 or lzma) or left uncompressed if none is available.
It also removes a couple of warnings which occur when no ramdisk
compression at all is chosen.
It also restores the select ZLIB_INFLATE in drivers/block/Kconfig
which somehow came missing. This is needed to activate compilation of
the stuff in zlib_deflate.
Signed-off-by: Alain Knaff <alain@knaff.lu>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: Partial resolution of build failure
Move the initrd/initramfs configuration options from
drivers/block/Kconfig to usr/Kconfig, since they do not and should not
depend on CONFIG_BLK_DEV. This fixes builds when CONFIG_BLK_DEV=n.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Modify gen_init_cpio so that lines that specify files can contain
what looks like a shell variable that's expanded during processing.
For example:
file /sbin/kinit ${RFS_BASE}/usr/src/klibc/kinit/kinit 0755 0 0
given RFS_BASE is "/some/directory" in the environment
would be expanded to
file /sbin/kinit /some/directory/usr/src/klibc/kinit/kinit 0755 0 0
If several environment variables appear in a line, they are all expanded
with processing happening from left to right.
Undefined variables expand to a null string.
Syntax errors stop processing, letting the existing error handling
show the user offending line.
This patch helps embedded folks who frequently create several
RFS directories and then switch between them as they're tuning
an initramfs.
Signed-off-by: gene.sally@timesys.com
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Treat an argument of "-" as meaning "read stdin for cpio files" so
gen_init_cpio can be piped into.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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headers_install by default puts headers into usr/include/ .
They're auto-generated, so should be ignored.
Same for *.orig, *.rej .
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Alexander E. Patrakov
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Extend usr/gen_init_cpio.c "file" entry, adding support for hard links.
Previous format:
file <name> <location> <mode> <uid> <gid>
New format:
file <name> <location> <mode> <uid> <gid> [<hard links>]
The hard links specification is optional, keeping the previous
behaviour.
All hard links are defined sequentially in the resulting cpio and the
file data is present only in the last link. This is the behaviour of
GNU's cpio and is supported by the kernel initramfs extractor.
Signed-off-by: Luciano Rocha <strange@nsk.no-ip.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The file init/initramfs.c is always compiled and linked in the kernel
vmlinux even when BLK_DEV_RAM and BLK_DEV_INITRD are disabled and the
system isn't using any form of an initramfs or initrd. In this situation
the code is only used to unpack a (static) default initial rootfilesystem.
The current init/initramfs.c code. usr/initramfs_data.o compiles to a size
of ~15 kbytes. Disabling BLK_DEV_RAM and BLK_DEV_INTRD shrinks the kernel
code size with ~60 Kbytes.
This patch avoids compiling in the code and data for initramfs support if
CONFIG_BLK_DEV_INITRD is not defined. Instead of the initramfs code and
data it uses a small routine in init/noinitramfs.c to setup an initial
static default environment for mounting a rootfilesystem later on in the
kernel initialisation process. The new code is: 164 bytes of size.
The patch is separated in two parts:
1) doesn't compile initramfs code when CONFIG_BLK_DEV_INITRD is not set
2) changing all plaforms vmlinux.lds.S files to not reserve an area of
PAGE_SIZE when CONFIG_BLK_DEV_INITRD is not set.
[deweerdt@free.fr: warning fix]
Signed-off-by: Jean-Paul Saman <jean-paul.saman@nxp.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Fix bug 7401.
Handle more than one source dir or file list to the initramfs gen scripts.
The Kconfig help for INITRAMFS_SOURCE claims that you can specify multiple
space-separated sources in order to allow unprivileged users to build an
image. There are two bugs in the current implementation that prevent this
from working.
First, we pass "file1 dir2" to the gen_initramfs_list.sh script, which it
obviously can't open.
Second, gen_initramfs_list.sh -l outputs multiple definitions for
deps_initramfs -- one for each argument.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Consistently decide when to rebuild a target across all of
if_changed, if_changed_dep, if_changed_rule.
PHONY targets are now treated alike (ignored) for all targets
While add it make Kbuild.include almost readable by factoring out a few
bits to some common variables and reuse this in Makefile.build.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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When a file supplied via CONFIG_INITRAMFS pointed to a file
for which kbuild had a rule to compile it (foo.c => foo.o)
then kbuild would compile the file before adding the
file to the initramfs.
Teach make that files included in initramfs shall not be updated by adding
an 'empty command'. (See "Using Empty Commands" in info make).
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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This patch fix double inclusion of ramfs-input.
Signed-off-by: Nickolay Vinogradov <nickolay@protei.ru>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Fix potential NULL pointer deref in gen_init_cpio.c spotted by coverity
checker. This fixes coverity bug #86
Without this patch we risk dereferencing a NULL `type' in the
"if ('\n' == *type) {" line.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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initramfs.cpio.gz being build in usr/ and included in the
kernel was not rebuild when the included files changed.
To fix this the following was done:
- let gen_initramfs.sh generate a list of files and directories included
in the initramfs
- gen_initramfs generate the gzipped cpio archive so we could simplify
the kbuild file (Makefile)
- utilising the kbuild infrastructure so when uid/gid root mapping changes
the initramfs will be rebuild
With this change we have a much more robust initramfs generation.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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This still leaves driver and architecture-specific subdirectories alone,
but gets rid of the bulk of the "generic" generated files that we should
ignore.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Move initramfs options from Device Drivers | Block Drivers to General Setup
This is a more natural place for this option.
Furthermore separate out intramfs options to usr/Kconfig
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Kbuild.include is a placeholder for definitions originally present in
both the top-level Makefile and scripts/Makefile.build.
There were a slight difference in the filechk definition, so the most videly
used version was kept and usr/Makefile was adopted for this syntax.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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This patch makes several tweaks so that an initramfs image can be
completely created by an unprivileged user. It should maintain
compatibility with previous initramfs early userspace cpio/image creation
and it updates documentation.
There are a few very important tweaks:
CONFIG_INITRAMFS_SOURCE is now either a single cpio archive that is
directly used or a list of directories and files for building a cpio
archive for the initramfs image. Making the cpio archive listable in
CONFIG_INITRAMFS_SOURCE makes the cpio step more official and automated so
that it doesn't have to be copied by hand to usr/initramfs_data.cpio (I
think this was broken anyway and would be overwritten). The alternative
list of directories *and* files means that files can be install in a "root"
directory and device-special files can be listed in a file list.
CONFIG_ROOT_UID and CONFIG_ROOT_GID are now available for doing simple
user/group ID translation. That means that user ID 500, group ID 500 can
create all the files in the "root" directory, but that they can all be
owned by user ID 0, group ID 0 in the cpio image.
Various documentation updates to pull it all together.
Removal of old cruft that was unused/misleading.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This patch makes gen_init_cpio more complete by adding symlink, pipe and
socket support. It updates scripts/gen_initramfs_list.sh to support the
new types. The patch applies to the recent mm series that already have the
updated gen_init_cpio and gen_initramfs_list.sh.
From: William Lee Irwin III <wli@holomorphy.com>
The rest of gen_init_cpio.c seems to cast the result of strlen() to handle
this situation, so this patch follows suit while killing off size_t -related
printk() warnings.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Moving logic to scripts/gen_initramfs_list.sh make a nice cleanup in
usr/Makefile.
A new initramfs image will be generated if the initramfs_list file changes.
This patch also fixes the bug with make O=..
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Attached is a patch that adds CONFIG_INITRAMFS_SOURCE, enabling you to
either specify a file as cpio_list, or a directory to generate a list from.
It depreciate the INITRAMFS_LIST environment variable introduced not long
ago.
There are some issues (suggestions/patches welcome) that I am not
sure about:
1) I put the menu entry under block devices, but I am not sure if
this is the correct location?
2) There might be a better (or more correct) way to do this with
kbuild?
3) Variable names and especially help text needs some love.
4) I am not sure if I am duplicating work in progress?
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This patch makes gen_init_cpio generate the initramfs_data.cpio from a file
which contains a list of entries: file, dir, nod. I swapped the order of
filename/location for the file arguments so that it would be more uniform
with the dir and node tyes.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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From: Pragnesh Sampat <pragnesh.sampat@timesys.com>
The file initramfs_data.cpio is slightly different when generated on
cygwin, compared to linux, which causes the kernel to panic with the
message "no cpio magic" (See Documentation/early-userspace/README).
The problem in cpio generation is due to the difference in sprintf
modifiers on cygwin. The code uses "%08ZX" for strlen of a device node.
printf man pages discourages "Z" and has 'z' instead. Both of these are
not available on cygwin sprintf (at least some versions of cygwin). The
net result of all of this is that the generated file literally contains
"ZX" and then the strlen after that and messes up that 110 offset etc. The
file is 516 bytes long on the system that I tested and on linux it is 512
bytes.
The fix below just uses "%08X" for that field.
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From: Olaf Hering <olh@suse.de>
We need to update `offset' here so that the subsequent push_pad() (which
uses `offset') will do the right thing.
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Dont print the contents of the initramfs, for any decent sized cpio it will
overflow the kernel ring buffer.
Also relax permissions on /dev (755 not 700).
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From: maximilian attems <janitor@sternwelten.at>
Use char arrays instead of char* for strings:
a. uses a single variable instead of two.
b. shorter code.
c. __initdata will be completely dropped.
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Update support for .incbin in /usr. No longer generate .S files
from within the Makefile.
Also deleted the assignment to LDFLAGS_BLOB for most architectures.
I did not touch ARM and cris:
arm: Russell told me they did not have a new as that could be used
cris: Looked like it was used for more than just usr/
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The kernel build leaves a temp file in linux/usr/ that make clean
doesn't remove. Fixed in the patch below.
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This makes initramfs use ".incbin" to include a binary blob into the
object file, instead of using LDFLAGS_BLOB, which isn't supported on all
architectures.
This will require reasonably modern binutils, but is portable.
This is the last thing that keeps the standard tree from building
directly for ia64.
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EXTRA_TARGETS served several purposes before:
1) List targets to be build (built-in only)
2) Inform kbuild of targets within the makefile
Mixing the above are causing confusion, so for now on
targets :=
is used to inform kbuild about targets in a Makefile - that it otherwise
did not know about.
kbuild uses the "targets :=" information to:
a) read the dependency file .target.cmd
b) delete the target file during make clean
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the build.
This also shows how to add files to the initramfs build, but is
commented out.
Patch originally done by Kai.
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Grrh, don't do last minute changes without retesting.
Adapt arch/alpha as well, other archs need to
o add LDFLAGS_BLOB to arch/$(ARCH)/Makefile
o add .init.ramfs to arch/$(ARCH)/vmlinux.lds.S
See arch/i386/{Makefile,vmlinux.lds.S} for guidance ;)
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