Linux/usr/Kconfig

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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TOMOYO Linux Cross Reference
Linux/usr/Kconfig

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Differences between /usr/Kconfig (Version linux-6.12-rc7) and /usr/Kconfig (Version linux-4.4.302)

TOMOYO Linux Cross Reference Linux/usr/Kconfig

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Differences between /usr/Kconfig (Version linux-6.12-rc7) and /usr/Kconfig (Version linux-4.4.302)

TOMOYO Linux Cross Reference
Linux/usr/Kconfig