2 tristate "Persistent store support"
3 select CRYPTO if PSTORE_COMPRESS
6 This option enables generic access to platform level
7 persistent storage via "pstore" filesystem that can
8 be mounted as /dev/pstore. Only useful if you have
9 a platform level driver that registers with pstore to
10 provide the data, so you probably should just go say "Y"
11 (or "M") to a platform specific persistent store driver
12 (e.g. ACPI_APEI on X86) which will select this for you.
13 If you don't have a platform persistent store driver,
16 config PSTORE_DEFLATE_COMPRESS
17 tristate "DEFLATE (ZLIB) compression"
22 This option enables DEFLATE (also known as ZLIB) compression
25 config PSTORE_LZO_COMPRESS
26 tristate "LZO compression"
30 This option enables LZO compression algorithm support.
32 config PSTORE_LZ4_COMPRESS
33 tristate "LZ4 compression"
37 This option enables LZ4 compression algorithm support.
39 config PSTORE_LZ4HC_COMPRESS
40 tristate "LZ4HC compression"
44 This option enables LZ4HC (high compression) mode algorithm.
46 config PSTORE_842_COMPRESS
47 bool "842 compression"
51 This option enables 842 compression algorithm support.
53 config PSTORE_COMPRESS
56 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
57 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
61 prompt "Default pstore compression algorithm"
62 depends on PSTORE_COMPRESS
64 This option chooses the default active compression algorithm.
65 This change be changed at boot with "pstore.compress=..." on
66 the kernel command line.
68 Currently, pstore has support for 5 compression algorithms:
69 deflate, lzo, lz4, lz4hc and 842.
71 The default compression algorithm is deflate.
73 config PSTORE_DEFLATE_COMPRESS_DEFAULT
74 bool "deflate" if PSTORE_DEFLATE_COMPRESS
76 config PSTORE_LZO_COMPRESS_DEFAULT
77 bool "lzo" if PSTORE_LZO_COMPRESS
79 config PSTORE_LZ4_COMPRESS_DEFAULT
80 bool "lz4" if PSTORE_LZ4_COMPRESS
82 config PSTORE_LZ4HC_COMPRESS_DEFAULT
83 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
85 config PSTORE_842_COMPRESS_DEFAULT
86 bool "842" if PSTORE_842_COMPRESS
90 config PSTORE_COMPRESS_DEFAULT
92 depends on PSTORE_COMPRESS
93 default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
94 default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
95 default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
96 default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
97 default "842" if PSTORE_842_COMPRESS_DEFAULT
100 bool "Log kernel console messages"
103 When the option is enabled, pstore will log all kernel
104 messages, even if no oops or panic happened.
107 bool "Log user space messages"
110 When the option is enabled, pstore will export a character
111 interface /dev/pmsg0 to log user space messages. On reboot
112 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
117 bool "Persistent function tracer"
119 depends on FUNCTION_TRACER
122 With this option kernel traces function calls into a persistent
123 ram buffer that can be decoded and dumped after reboot through
124 pstore filesystem. It can be used to determine what function
125 was last called before a reset or panic.
130 tristate "Log panic/oops to a RAM buffer"
133 depends on HAVE_MEMBLOCK
135 select REED_SOLOMON_ENC8
136 select REED_SOLOMON_DEC8
138 This enables panic and oops messages to be logged to a circular
139 buffer in RAM where it can be read back at some later point.
141 Note that for historical reasons, the module will be named
144 For more information, see Documentation/admin-guide/ramoops.rst.