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TOMOYO Linux Cross Reference
Linux/usr/Kconfig

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Diff markup

Differences between /usr/Kconfig (Version linux-6.11.5) and /usr/Kconfig (Version linux-6.0.19)


  1 # SPDX-License-Identifier: GPL-2.0                  1 # SPDX-License-Identifier: GPL-2.0
  2 #                                                   2 #
  3 # Configuration for initramfs                       3 # Configuration for initramfs
  4 #                                                   4 #
  5                                                     5 
  6 config INITRAMFS_SOURCE                             6 config INITRAMFS_SOURCE
  7         string "Initramfs source file(s)"           7         string "Initramfs source file(s)"
  8         default ""                                  8         default ""
  9         help                                        9         help
 10           This can be either a single cpio arc     10           This can be either a single cpio archive with a .cpio suffix or a
 11           space-separated list of directories      11           space-separated list of directories and files for building the
 12           initramfs image.  A cpio archive sho     12           initramfs image.  A cpio archive should contain a filesystem archive
 13           to be used as an initramfs image.  D     13           to be used as an initramfs image.  Directories should contain a
 14           filesystem layout to be included in      14           filesystem layout to be included in the initramfs image.  Files
 15           should contain entries according to      15           should contain entries according to the format described by the
 16           "usr/gen_init_cpio" program in the k     16           "usr/gen_init_cpio" program in the kernel tree.
 17                                                    17 
 18           When multiple directories and files      18           When multiple directories and files are specified then the
 19           initramfs image will be the aggregat     19           initramfs image will be the aggregate of all of them.
 20                                                    20 
 21           See <file:Documentation/driver-api/e     21           See <file:Documentation/driver-api/early-userspace/early_userspace_support.rst> for more details.
 22                                                    22 
 23           If you are not sure, leave it blank.     23           If you are not sure, leave it blank.
 24                                                    24 
 25 config INITRAMFS_FORCE                             25 config INITRAMFS_FORCE
 26         bool "Ignore the initramfs passed by t     26         bool "Ignore the initramfs passed by the bootloader"
 27         depends on CMDLINE_EXTEND || CMDLINE_F     27         depends on CMDLINE_EXTEND || CMDLINE_FORCE
 28         help                                       28         help
 29           This option causes the kernel to ign     29           This option causes the kernel to ignore the initramfs image
 30           (or initrd image) passed to it by th     30           (or initrd image) passed to it by the bootloader. This is
 31           analogous to CMDLINE_FORCE, which is     31           analogous to CMDLINE_FORCE, which is found on some architectures,
 32           and is useful if you cannot or don't     32           and is useful if you cannot or don't want to change the image
 33           your bootloader passes to the kernel     33           your bootloader passes to the kernel.
 34                                                    34 
 35 config INITRAMFS_ROOT_UID                          35 config INITRAMFS_ROOT_UID
 36         int "User ID to map to 0 (user root)"      36         int "User ID to map to 0 (user root)"
 37         depends on INITRAMFS_SOURCE!=""            37         depends on INITRAMFS_SOURCE!=""
 38         default "0"                                38         default "0"
 39         help                                       39         help
 40           If INITRAMFS_SOURCE points to a dire     40           If INITRAMFS_SOURCE points to a directory, files owned by this UID
 41           (-1 = current user) will be owned by     41           (-1 = current user) will be owned by root in the resulting image.
 42                                                    42 
 43           If you are not sure, leave it set to     43           If you are not sure, leave it set to "0".
 44                                                    44 
 45 config INITRAMFS_ROOT_GID                          45 config INITRAMFS_ROOT_GID
 46         int "Group ID to map to 0 (group root)     46         int "Group ID to map to 0 (group root)"
 47         depends on INITRAMFS_SOURCE!=""            47         depends on INITRAMFS_SOURCE!=""
 48         default "0"                                48         default "0"
 49         help                                       49         help
 50           If INITRAMFS_SOURCE points to a dire     50           If INITRAMFS_SOURCE points to a directory, files owned by this GID
 51           (-1 = current group) will be owned b     51           (-1 = current group) will be owned by root in the resulting image.
 52                                                    52 
 53           If you are not sure, leave it set to     53           If you are not sure, leave it set to "0".
 54                                                    54 
 55 config RD_GZIP                                     55 config RD_GZIP
 56         bool "Support initial ramdisk/ramfs co     56         bool "Support initial ramdisk/ramfs compressed using gzip"
 57         default y                                  57         default y
 58         select DECOMPRESS_GZIP                     58         select DECOMPRESS_GZIP
 59         help                                       59         help
 60           Support loading of a gzip encoded in     60           Support loading of a gzip encoded initial ramdisk or cpio buffer.
 61           If unsure, say Y.                        61           If unsure, say Y.
 62                                                    62 
 63 config RD_BZIP2                                    63 config RD_BZIP2
 64         bool "Support initial ramdisk/ramfs co     64         bool "Support initial ramdisk/ramfs compressed using bzip2"
 65         default y                                  65         default y
 66         select DECOMPRESS_BZIP2                    66         select DECOMPRESS_BZIP2
 67         help                                       67         help
 68           Support loading of a bzip2 encoded i     68           Support loading of a bzip2 encoded initial ramdisk or cpio buffer
 69           If unsure, say N.                        69           If unsure, say N.
 70                                                    70 
 71 config RD_LZMA                                     71 config RD_LZMA
 72         bool "Support initial ramdisk/ramfs co     72         bool "Support initial ramdisk/ramfs compressed using LZMA"
 73         default y                                  73         default y
 74         select DECOMPRESS_LZMA                     74         select DECOMPRESS_LZMA
 75         help                                       75         help
 76           Support loading of a LZMA encoded in     76           Support loading of a LZMA encoded initial ramdisk or cpio buffer
 77           If unsure, say N.                        77           If unsure, say N.
 78                                                    78 
 79 config RD_XZ                                       79 config RD_XZ
 80         bool "Support initial ramdisk/ramfs co     80         bool "Support initial ramdisk/ramfs compressed using XZ"
 81         default y                                  81         default y
 82         select DECOMPRESS_XZ                       82         select DECOMPRESS_XZ
 83         help                                       83         help
 84           Support loading of a XZ encoded init     84           Support loading of a XZ encoded initial ramdisk or cpio buffer.
 85           If unsure, say N.                        85           If unsure, say N.
 86                                                    86 
 87 config RD_LZO                                      87 config RD_LZO
 88         bool "Support initial ramdisk/ramfs co     88         bool "Support initial ramdisk/ramfs compressed using LZO"
 89         default y                                  89         default y
 90         select DECOMPRESS_LZO                      90         select DECOMPRESS_LZO
 91         help                                       91         help
 92           Support loading of a LZO encoded ini     92           Support loading of a LZO encoded initial ramdisk or cpio buffer
 93           If unsure, say N.                        93           If unsure, say N.
 94                                                    94 
 95 config RD_LZ4                                      95 config RD_LZ4
 96         bool "Support initial ramdisk/ramfs co     96         bool "Support initial ramdisk/ramfs compressed using LZ4"
 97         default y                                  97         default y
 98         select DECOMPRESS_LZ4                      98         select DECOMPRESS_LZ4
 99         help                                       99         help
100           Support loading of a LZ4 encoded ini    100           Support loading of a LZ4 encoded initial ramdisk or cpio buffer
101           If unsure, say N.                       101           If unsure, say N.
102                                                   102 
103 config RD_ZSTD                                    103 config RD_ZSTD
104         bool "Support initial ramdisk/ramfs co    104         bool "Support initial ramdisk/ramfs compressed using ZSTD"
105         default y                                 105         default y
106         select DECOMPRESS_ZSTD                    106         select DECOMPRESS_ZSTD
107         help                                      107         help
108           Support loading of a ZSTD encoded in    108           Support loading of a ZSTD encoded initial ramdisk or cpio buffer.
109           If unsure, say N.                       109           If unsure, say N.
110                                                   110 
111 choice                                            111 choice
112         prompt "Built-in initramfs compression    112         prompt "Built-in initramfs compression mode"
113         depends on INITRAMFS_SOURCE != ""         113         depends on INITRAMFS_SOURCE != ""
114         help                                      114         help
115           This option allows you to decide by     115           This option allows you to decide by which algorithm the builtin
116           initramfs will be compressed.  Sever    116           initramfs will be compressed.  Several compression algorithms are
117           available, which differ in efficienc    117           available, which differ in efficiency, compression and
118           decompression speed.  Compression sp    118           decompression speed.  Compression speed is only relevant
119           when building a kernel.  Decompressi    119           when building a kernel.  Decompression speed is relevant at
120           each boot. Also the memory usage dur    120           each boot. Also the memory usage during decompression may become
121           relevant on memory constrained syste    121           relevant on memory constrained systems. This is usually based on the
122           dictionary size of the algorithm wit    122           dictionary size of the algorithm with algorithms like XZ and LZMA
123           featuring large dictionary sizes.       123           featuring large dictionary sizes.
124                                                   124 
125           High compression options are mostly     125           High compression options are mostly useful for users who are
126           low on RAM, since it reduces the mem    126           low on RAM, since it reduces the memory consumption during
127           boot.                                   127           boot.
128                                                   128 
129           Keep in mind that your build system     129           Keep in mind that your build system needs to provide the appropriate
130           compression tool to compress the gen    130           compression tool to compress the generated initram cpio file for
131           embedding.                              131           embedding.
132                                                   132 
133           If in doubt, select 'None'              133           If in doubt, select 'None'
134                                                   134 
135 config INITRAMFS_COMPRESSION_GZIP                 135 config INITRAMFS_COMPRESSION_GZIP
136         bool "Gzip"                               136         bool "Gzip"
137         depends on RD_GZIP                        137         depends on RD_GZIP
138         help                                      138         help
139           Use the old and well tested gzip com    139           Use the old and well tested gzip compression algorithm. Gzip provides
140           a good balance between compression r    140           a good balance between compression ratio and decompression speed and
141           has a reasonable compression speed.     141           has a reasonable compression speed. It is also more likely to be
142           supported by your build system as th    142           supported by your build system as the gzip tool is present by default
143           on most distros.                        143           on most distros.
144                                                   144 
145 config INITRAMFS_COMPRESSION_BZIP2                145 config INITRAMFS_COMPRESSION_BZIP2
146         bool "Bzip2"                              146         bool "Bzip2"
147         depends on RD_BZIP2                       147         depends on RD_BZIP2
148         help                                      148         help
149           It's compression ratio and speed is     149           It's compression ratio and speed is intermediate. Decompression speed
150           is slowest among the choices. The in    150           is slowest among the choices. The initramfs size is about 10% smaller
151           with bzip2, in comparison to gzip. B    151           with bzip2, in comparison to gzip. Bzip2 uses a large amount of
152           memory. For modern kernels you will     152           memory. For modern kernels you will need at least 8MB RAM or more for
153           booting.                                153           booting.
154                                                   154 
155           If you choose this, keep in mind tha    155           If you choose this, keep in mind that you need to have the bzip2 tool
156           available to be able to compress the    156           available to be able to compress the initram.
157                                                   157 
158 config INITRAMFS_COMPRESSION_LZMA                 158 config INITRAMFS_COMPRESSION_LZMA
159         bool "LZMA"                               159         bool "LZMA"
160         depends on RD_LZMA                        160         depends on RD_LZMA
161         help                                      161         help
162           This algorithm's compression ratio i    162           This algorithm's compression ratio is best but has a large dictionary
163           size which might cause issues in mem    163           size which might cause issues in memory constrained systems.
164           Decompression speed is between the o    164           Decompression speed is between the other choices. Compression is
165           slowest. The initramfs size is about    165           slowest. The initramfs size is about 33% smaller with LZMA in
166           comparison to gzip.                     166           comparison to gzip.
167                                                   167 
168           If you choose this, keep in mind tha    168           If you choose this, keep in mind that you may need to install the xz
169           or lzma tools to be able to compress    169           or lzma tools to be able to compress the initram.
170                                                   170 
171 config INITRAMFS_COMPRESSION_XZ                   171 config INITRAMFS_COMPRESSION_XZ
172         bool "XZ"                                 172         bool "XZ"
173         depends on RD_XZ                          173         depends on RD_XZ
174         help                                      174         help
175           XZ uses the LZMA2 algorithm and has     175           XZ uses the LZMA2 algorithm and has a large dictionary which may cause
176           problems on memory constrained syste    176           problems on memory constrained systems. The initramfs size is about
177           30% smaller with XZ in comparison to    177           30% smaller with XZ in comparison to gzip. Decompression speed is
178           better than that of bzip2 but worse     178           better than that of bzip2 but worse than gzip and LZO. Compression is
179           slow.                                   179           slow.
180                                                   180 
181           If you choose this, keep in mind tha    181           If you choose this, keep in mind that you may need to install the xz
182           tool to be able to compress the init    182           tool to be able to compress the initram.
183                                                   183 
184 config INITRAMFS_COMPRESSION_LZO                  184 config INITRAMFS_COMPRESSION_LZO
185         bool "LZO"                                185         bool "LZO"
186         depends on RD_LZO                         186         depends on RD_LZO
187         help                                      187         help
188           Its compression ratio is the second  !! 188           It's compression ratio is the second poorest amongst the choices. The
189           kernel size is about 10% bigger than !! 189           kernel size is about 10% bigger than gzip. Despite that, it's
190           decompression speed is the second fa !! 190           decompression speed is the second fastest and it's compression speed
191           is quite fast too.                      191           is quite fast too.
192                                                   192 
193           If you choose this, keep in mind tha    193           If you choose this, keep in mind that you may need to install the lzop
194           tool to be able to compress the init    194           tool to be able to compress the initram.
195                                                   195 
196 config INITRAMFS_COMPRESSION_LZ4                  196 config INITRAMFS_COMPRESSION_LZ4
197         bool "LZ4"                                197         bool "LZ4"
198         depends on RD_LZ4                         198         depends on RD_LZ4
199         help                                      199         help
200           It's compression ratio is the poores    200           It's compression ratio is the poorest amongst the choices. The kernel
201           size is about 15% bigger than gzip;     201           size is about 15% bigger than gzip; however its decompression speed
202           is the fastest.                         202           is the fastest.
203                                                   203 
204           If you choose this, keep in mind tha    204           If you choose this, keep in mind that most distros don't provide lz4
205           by default which could cause a build    205           by default which could cause a build failure.
206                                                   206 
207 config INITRAMFS_COMPRESSION_ZSTD                 207 config INITRAMFS_COMPRESSION_ZSTD
208         bool "ZSTD"                               208         bool "ZSTD"
209         depends on RD_ZSTD                        209         depends on RD_ZSTD
210         help                                      210         help
211           ZSTD is a compression algorithm targ    211           ZSTD is a compression algorithm targeting intermediate compression
212           with fast decompression speed. It wi    212           with fast decompression speed. It will compress better than GZIP and
213           decompress around the same speed as     213           decompress around the same speed as LZO, but slower than LZ4.
214                                                   214 
215           If you choose this, keep in mind tha    215           If you choose this, keep in mind that you may need to install the zstd
216           tool to be able to compress the init    216           tool to be able to compress the initram.
217                                                   217 
218 config INITRAMFS_COMPRESSION_NONE                 218 config INITRAMFS_COMPRESSION_NONE
219         bool "None"                               219         bool "None"
220         help                                      220         help
221           Do not compress the built-in initram    221           Do not compress the built-in initramfs at all. This may sound wasteful
222           in space, but, you should be aware t    222           in space, but, you should be aware that the built-in initramfs will be
223           compressed at a later stage anyways     223           compressed at a later stage anyways along with the rest of the kernel,
224           on those architectures that support     224           on those architectures that support this. However, not compressing the
225           initramfs may lead to slightly highe    225           initramfs may lead to slightly higher memory consumption during a
226           short time at boot, while both the c    226           short time at boot, while both the cpio image and the unpacked
227           filesystem image will be present in     227           filesystem image will be present in memory simultaneously
228                                                   228 
229 endchoice                                         229 endchoice
                                                      

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