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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-06 14:59:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-06 14:59:01 -0700
commit69824bcc4b4e1427ac18a76057d592ec9028f2fe (patch)
tree98abb9aa0f80004cb742600c072e323b24264728
parent3b54765cca23152ec0cc254b75c877c10f6e2870 (diff)
parent58eb5b6707477ff458db3ee522aac317da719e2a (diff)
downloadlinux-69824bcc4b4e1427ac18a76057d592ec9028f2fe.tar.bz2
Merge tag 'pstore-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull pstore updates from Kees Cook: "This cycle was almost entirely improvements to the pstore compression options, noted below: - Add lz4hc and 842 to pstore compression options (Geliang Tang) - Refactor to use crypto compression API (Geliang Tang) - Fix up Kconfig dependencies for compression (Arnd Bergmann) - Allow for run-time compression selection - Remove stack VLA usage" * tag 'pstore-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: pstore: fix crypto dependencies pstore: Use crypto compress API pstore/ram: Do not use stack VLA for parity workspace pstore: Select compression at runtime pstore: Avoid size casts for 842 compression pstore: Add lz4hc and 842 compression support
-rw-r--r--fs/pstore/Kconfig101
-rw-r--r--fs/pstore/inode.c2
-rw-r--r--fs/pstore/internal.h3
-rw-r--r--fs/pstore/platform.c372
-rw-r--r--fs/pstore/ram.c2
-rw-r--r--fs/pstore/ram_core.c29
-rw-r--r--include/linux/pstore_ram.h1
7 files changed, 226 insertions, 284 deletions
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index b42e5bd6d8ff..09c19ef91526 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -1,5 +1,6 @@
config PSTORE
tristate "Persistent store support"
+ select CRYPTO if PSTORE_COMPRESS
default n
help
This option enables generic access to platform level
@@ -12,35 +13,89 @@ config PSTORE
If you don't have a platform persistent store driver,
say N.
-choice
- prompt "Choose compression algorithm"
- depends on PSTORE
- default PSTORE_ZLIB_COMPRESS
- help
- This option chooses compression algorithm.
-
-config PSTORE_ZLIB_COMPRESS
- bool "ZLIB"
- select ZLIB_DEFLATE
- select ZLIB_INFLATE
- help
- This option enables ZLIB compression algorithm support.
+config PSTORE_DEFLATE_COMPRESS
+ tristate "DEFLATE (ZLIB) compression"
+ default y
+ depends on PSTORE
+ select CRYPTO_DEFLATE
+ help
+ This option enables DEFLATE (also known as ZLIB) compression
+ algorithm support.
config PSTORE_LZO_COMPRESS
- bool "LZO"
- select LZO_COMPRESS
- select LZO_DECOMPRESS
- help
- This option enables LZO compression algorithm support.
+ tristate "LZO compression"
+ depends on PSTORE
+ select CRYPTO_LZO
+ help
+ This option enables LZO compression algorithm support.
config PSTORE_LZ4_COMPRESS
- bool "LZ4"
- select LZ4_COMPRESS
- select LZ4_DECOMPRESS
- help
- This option enables LZ4 compression algorithm support.
+ tristate "LZ4 compression"
+ depends on PSTORE
+ select CRYPTO_LZ4
+ help
+ This option enables LZ4 compression algorithm support.
+
+config PSTORE_LZ4HC_COMPRESS
+ tristate "LZ4HC compression"
+ depends on PSTORE
+ select CRYPTO_LZ4HC
+ help
+ This option enables LZ4HC (high compression) mode algorithm.
+
+config PSTORE_842_COMPRESS
+ bool "842 compression"
+ depends on PSTORE
+ select CRYPTO_842
+ help
+ This option enables 842 compression algorithm support.
+
+config PSTORE_COMPRESS
+ def_bool y
+ depends on PSTORE
+ depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
+ PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
+ PSTORE_842_COMPRESS
+
+choice
+ prompt "Default pstore compression algorithm"
+ depends on PSTORE_COMPRESS
+ help
+ This option chooses the default active compression algorithm.
+ This change be changed at boot with "pstore.compress=..." on
+ the kernel command line.
+
+ Currently, pstore has support for 5 compression algorithms:
+ deflate, lzo, lz4, lz4hc and 842.
+
+ The default compression algorithm is deflate.
+
+ config PSTORE_DEFLATE_COMPRESS_DEFAULT
+ bool "deflate" if PSTORE_DEFLATE_COMPRESS
+
+ config PSTORE_LZO_COMPRESS_DEFAULT
+ bool "lzo" if PSTORE_LZO_COMPRESS
+
+ config PSTORE_LZ4_COMPRESS_DEFAULT
+ bool "lz4" if PSTORE_LZ4_COMPRESS
+
+ config PSTORE_LZ4HC_COMPRESS_DEFAULT
+ bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
+
+ config PSTORE_842_COMPRESS_DEFAULT
+ bool "842" if PSTORE_842_COMPRESS
+
endchoice
+config PSTORE_COMPRESS_DEFAULT
+ string
+ depends on PSTORE_COMPRESS
+ default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
+ default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
+ default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
+ default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
+ default "842" if PSTORE_842_COMPRESS_DEFAULT
+
config PSTORE_CONSOLE
bool "Log kernel console messages"
depends on PSTORE
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index d814723fb27d..5fcb845b9fec 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -486,6 +486,8 @@ static int __init init_pstore_fs(void)
{
int err;
+ pstore_choose_compression();
+
/* Create a convenient mount point for people to access pstore */
err = sysfs_create_mount_point(fs_kobj, "pstore");
if (err)
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index c029314478fa..fb767e28aeb2 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -37,4 +37,7 @@ extern bool pstore_is_mounted(void);
extern void pstore_record_init(struct pstore_record *record,
struct pstore_info *psi);
+/* Called during module_init() */
+extern void __init pstore_choose_compression(void);
+
#endif
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c3129b131e4d..1143ef351c58 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -28,15 +28,13 @@
#include <linux/console.h>
#include <linux/module.h>
#include <linux/pstore.h>
-#ifdef CONFIG_PSTORE_ZLIB_COMPRESS
-#include <linux/zlib.h>
-#endif
-#ifdef CONFIG_PSTORE_LZO_COMPRESS
+#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
#include <linux/lzo.h>
#endif
-#ifdef CONFIG_PSTORE_LZ4_COMPRESS
+#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
#include <linux/lz4.h>
#endif
+#include <linux/crypto.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
@@ -74,23 +72,18 @@ static DEFINE_SPINLOCK(pstore_lock);
struct pstore_info *psinfo;
static char *backend;
-
-/* Compression parameters */
-#ifdef CONFIG_PSTORE_ZLIB_COMPRESS
-#define COMPR_LEVEL 6
-#define WINDOW_BITS 12
-#define MEM_LEVEL 4
-static struct z_stream_s stream;
+static char *compress =
+#ifdef CONFIG_PSTORE_COMPRESS_DEFAULT
+ CONFIG_PSTORE_COMPRESS_DEFAULT;
#else
-static unsigned char *workspace;
+ NULL;
#endif
-struct pstore_zbackend {
- int (*compress)(const void *in, void *out, size_t inlen, size_t outlen);
- int (*decompress)(void *in, void *out, size_t inlen, size_t outlen);
- void (*allocate)(void);
- void (*free)(void);
+/* Compression parameters */
+static struct crypto_comp *tfm;
+struct pstore_zbackend {
+ int (*zbufsize)(size_t size);
const char *name;
};
@@ -149,77 +142,12 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
}
EXPORT_SYMBOL_GPL(pstore_cannot_block_path);
-#ifdef CONFIG_PSTORE_ZLIB_COMPRESS
-/* Derived from logfs_compress() */
-static int compress_zlib(const void *in, void *out, size_t inlen, size_t outlen)
-{
- int err, ret;
-
- ret = -EIO;
- err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
- MEM_LEVEL, Z_DEFAULT_STRATEGY);
- if (err != Z_OK)
- goto error;
-
- stream.next_in = in;
- stream.avail_in = inlen;
- stream.total_in = 0;
- stream.next_out = out;
- stream.avail_out = outlen;
- stream.total_out = 0;
-
- err = zlib_deflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END)
- goto error;
-
- err = zlib_deflateEnd(&stream);
- if (err != Z_OK)
- goto error;
-
- if (stream.total_out >= stream.total_in)
- goto error;
-
- ret = stream.total_out;
-error:
- return ret;
-}
-
-/* Derived from logfs_uncompress */
-static int decompress_zlib(void *in, void *out, size_t inlen, size_t outlen)
+#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
+static int zbufsize_deflate(size_t size)
{
- int err, ret;
-
- ret = -EIO;
- err = zlib_inflateInit2(&stream, WINDOW_BITS);
- if (err != Z_OK)
- goto error;
-
- stream.next_in = in;
- stream.avail_in = inlen;
- stream.total_in = 0;
- stream.next_out = out;
- stream.avail_out = outlen;
- stream.total_out = 0;
-
- err = zlib_inflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END)
- goto error;
-
- err = zlib_inflateEnd(&stream);
- if (err != Z_OK)
- goto error;
-
- ret = stream.total_out;
-error:
- return ret;
-}
-
-static void allocate_zlib(void)
-{
- size_t size;
size_t cmpr;
- switch (psinfo->bufsize) {
+ switch (size) {
/* buffer range for efivars */
case 1000 ... 2000:
cmpr = 56;
@@ -239,212 +167,131 @@ static void allocate_zlib(void)
break;
}
- big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr;
- big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
- if (big_oops_buf) {
- size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL),
- zlib_inflate_workspacesize());
- stream.workspace = kmalloc(size, GFP_KERNEL);
- if (!stream.workspace) {
- pr_err("No memory for compression workspace; skipping compression\n");
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- }
- } else {
- pr_err("No memory for uncompressed data; skipping compression\n");
- stream.workspace = NULL;
- }
-
+ return (size * 100) / cmpr;
}
-
-static void free_zlib(void)
-{
- kfree(stream.workspace);
- stream.workspace = NULL;
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- big_oops_buf_sz = 0;
-}
-
-static const struct pstore_zbackend backend_zlib = {
- .compress = compress_zlib,
- .decompress = decompress_zlib,
- .allocate = allocate_zlib,
- .free = free_zlib,
- .name = "zlib",
-};
#endif
-#ifdef CONFIG_PSTORE_LZO_COMPRESS
-static int compress_lzo(const void *in, void *out, size_t inlen, size_t outlen)
+#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
+static int zbufsize_lzo(size_t size)
{
- int ret;
-
- ret = lzo1x_1_compress(in, inlen, out, &outlen, workspace);
- if (ret != LZO_E_OK) {
- pr_err("lzo_compress error, ret = %d!\n", ret);
- return -EIO;
- }
-
- return outlen;
+ return lzo1x_worst_compress(size);
}
+#endif
-static int decompress_lzo(void *in, void *out, size_t inlen, size_t outlen)
+#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
+static int zbufsize_lz4(size_t size)
{
- int ret;
-
- ret = lzo1x_decompress_safe(in, inlen, out, &outlen);
- if (ret != LZO_E_OK) {
- pr_err("lzo_decompress error, ret = %d!\n", ret);
- return -EIO;
- }
-
- return outlen;
+ return LZ4_compressBound(size);
}
+#endif
-static void allocate_lzo(void)
+#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
+static int zbufsize_842(size_t size)
{
- big_oops_buf_sz = lzo1x_worst_compress(psinfo->bufsize);
- big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
- if (big_oops_buf) {
- workspace = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
- if (!workspace) {
- pr_err("No memory for compression workspace; skipping compression\n");
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- }
- } else {
- pr_err("No memory for uncompressed data; skipping compression\n");
- workspace = NULL;
- }
+ return size;
}
+#endif
-static void free_lzo(void)
-{
- kfree(workspace);
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- big_oops_buf_sz = 0;
-}
+static const struct pstore_zbackend *zbackend __ro_after_init;
-static const struct pstore_zbackend backend_lzo = {
- .compress = compress_lzo,
- .decompress = decompress_lzo,
- .allocate = allocate_lzo,
- .free = free_lzo,
- .name = "lzo",
-};
+static const struct pstore_zbackend zbackends[] = {
+#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
+ {
+ .zbufsize = zbufsize_deflate,
+ .name = "deflate",
+ },
+#endif
+#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
+ {
+ .zbufsize = zbufsize_lzo,
+ .name = "lzo",
+ },
+#endif
+#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS)
+ {
+ .zbufsize = zbufsize_lz4,
+ .name = "lz4",
+ },
#endif
+#if IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
+ {
+ .zbufsize = zbufsize_lz4,
+ .name = "lz4hc",
+ },
+#endif
+#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
+ {
+ .zbufsize = zbufsize_842,
+ .name = "842",
+ },
+#endif
+ { }
+};
-#ifdef CONFIG_PSTORE_LZ4_COMPRESS
-static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
+static int pstore_compress(const void *in, void *out,
+ unsigned int inlen, unsigned int outlen)
{
int ret;
- ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
- if (!ret) {
- pr_err("LZ4_compress_default error; compression failed!\n");
- return -EIO;
+ ret = crypto_comp_compress(tfm, in, inlen, out, &outlen);
+ if (ret) {
+ pr_err("crypto_comp_compress failed, ret = %d!\n", ret);
+ return ret;
}
- return ret;
+ return outlen;
}
-static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
+static int pstore_decompress(void *in, void *out,
+ unsigned int inlen, unsigned int outlen)
{
int ret;
- ret = LZ4_decompress_safe(in, out, inlen, outlen);
- if (ret < 0) {
- /*
- * LZ4_decompress_safe will return an error code
- * (< 0) if decompression failed
- */
- pr_err("LZ4_decompress_safe error, ret = %d!\n", ret);
- return -EIO;
+ ret = crypto_comp_decompress(tfm, in, inlen, out, &outlen);
+ if (ret) {
+ pr_err("crypto_comp_decompress failed, ret = %d!\n", ret);
+ return ret;
}
- return ret;
-}
-
-static void allocate_lz4(void)
-{
- big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
- big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
- if (big_oops_buf) {
- workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
- if (!workspace) {
- pr_err("No memory for compression workspace; skipping compression\n");
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- }
- } else {
- pr_err("No memory for uncompressed data; skipping compression\n");
- workspace = NULL;
- }
+ return outlen;
}
-static void free_lz4(void)
+static void allocate_buf_for_compression(void)
{
- kfree(workspace);
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- big_oops_buf_sz = 0;
-}
-
-static const struct pstore_zbackend backend_lz4 = {
- .compress = compress_lz4,
- .decompress = decompress_lz4,
- .allocate = allocate_lz4,
- .free = free_lz4,
- .name = "lz4",
-};
-#endif
-
-static const struct pstore_zbackend *zbackend =
-#if defined(CONFIG_PSTORE_ZLIB_COMPRESS)
- &backend_zlib;
-#elif defined(CONFIG_PSTORE_LZO_COMPRESS)
- &backend_lzo;
-#elif defined(CONFIG_PSTORE_LZ4_COMPRESS)
- &backend_lz4;
-#else
- NULL;
-#endif
+ if (!zbackend)
+ return;
-static int pstore_compress(const void *in, void *out,
- size_t inlen, size_t outlen)
-{
- if (zbackend)
- return zbackend->compress(in, out, inlen, outlen);
- else
- return -EIO;
-}
+ if (!crypto_has_comp(zbackend->name, 0, 0)) {
+ pr_err("No %s compression\n", zbackend->name);
+ return;
+ }
-static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen)
-{
- if (zbackend)
- return zbackend->decompress(in, out, inlen, outlen);
- else
- return -EIO;
-}
+ big_oops_buf_sz = zbackend->zbufsize(psinfo->bufsize);
+ if (big_oops_buf_sz <= 0)
+ return;
-static void allocate_buf_for_compression(void)
-{
- if (zbackend) {
- pr_info("using %s compression\n", zbackend->name);
- zbackend->allocate();
- } else {
+ big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
+ if (!big_oops_buf) {
pr_err("allocate compression buffer error!\n");
+ return;
+ }
+
+ tfm = crypto_alloc_comp(zbackend->name, 0, 0);
+ if (IS_ERR_OR_NULL(tfm)) {
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ pr_err("crypto_alloc_comp() failed!\n");
+ return;
}
}
static void free_buf_for_compression(void)
{
- if (zbackend)
- zbackend->free();
- else
- pr_err("free compression buffer error!\n");
+ if (!IS_ERR_OR_NULL(tfm))
+ crypto_free_comp(tfm);
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ big_oops_buf_sz = 0;
}
/*
@@ -901,5 +748,24 @@ static void pstore_timefunc(struct timer_list *unused)
jiffies + msecs_to_jiffies(pstore_update_ms));
}
+void __init pstore_choose_compression(void)
+{
+ const struct pstore_zbackend *step;
+
+ if (!compress)
+ return;
+
+ for (step = zbackends; step->name; step++) {
+ if (!strcmp(compress, step->name)) {
+ zbackend = step;
+ pr_info("using %s compression\n", zbackend->name);
+ return;
+ }
+ }
+}
+
+module_param(compress, charp, 0444);
+MODULE_PARM_DESC(compress, "Pstore compression to use");
+
module_param(backend, charp, 0444);
MODULE_PARM_DESC(backend, "Pstore backend to use");
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 7125b398d312..49b2bc114868 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -938,7 +938,7 @@ static int __init ramoops_init(void)
ramoops_register_dummy();
return platform_driver_register(&ramoops_driver);
}
-postcore_initcall(ramoops_init);
+late_initcall(ramoops_init);
static void __exit ramoops_exit(void)
{
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index e11672aa4575..951a14edcf51 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -98,24 +98,23 @@ static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
uint8_t *data, size_t len, uint8_t *ecc)
{
int i;
- uint16_t par[prz->ecc_info.ecc_size];
/* Initialize the parity buffer */
- memset(par, 0, sizeof(par));
- encode_rs8(prz->rs_decoder, data, len, par, 0);
+ memset(prz->ecc_info.par, 0,
+ prz->ecc_info.ecc_size * sizeof(prz->ecc_info.par[0]));
+ encode_rs8(prz->rs_decoder, data, len, prz->ecc_info.par, 0);
for (i = 0; i < prz->ecc_info.ecc_size; i++)
- ecc[i] = par[i];
+ ecc[i] = prz->ecc_info.par[i];
}
static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz,
void *data, size_t len, uint8_t *ecc)
{
int i;
- uint16_t par[prz->ecc_info.ecc_size];
for (i = 0; i < prz->ecc_info.ecc_size; i++)
- par[i] = ecc[i];
- return decode_rs8(prz->rs_decoder, data, par, len,
+ prz->ecc_info.par[i] = ecc[i];
+ return decode_rs8(prz->rs_decoder, data, prz->ecc_info.par, len,
NULL, 0, NULL, 0, NULL);
}
@@ -228,6 +227,15 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
return -EINVAL;
}
+ /* allocate workspace instead of using stack VLA */
+ prz->ecc_info.par = kmalloc_array(prz->ecc_info.ecc_size,
+ sizeof(*prz->ecc_info.par),
+ GFP_KERNEL);
+ if (!prz->ecc_info.par) {
+ pr_err("cannot allocate ECC parity workspace\n");
+ return -ENOMEM;
+ }
+
prz->corrected_bytes = 0;
prz->bad_blocks = 0;
@@ -514,6 +522,13 @@ void persistent_ram_free(struct persistent_ram_zone *prz)
}
prz->vaddr = NULL;
}
+ if (prz->rs_decoder) {
+ free_rs(prz->rs_decoder);
+ prz->rs_decoder = NULL;
+ }
+ kfree(prz->ecc_info.par);
+ prz->ecc_info.par = NULL;
+
persistent_ram_free_old(prz);
kfree(prz);
}
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index 9395f06e8372..e6d226464838 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -39,6 +39,7 @@ struct persistent_ram_ecc_info {
int ecc_size;
int symsize;
int poly;
+ uint16_t *par;
};
struct persistent_ram_zone {