Re: [PATCH 3/3] fs: unicode: Add utf8 module and a unicode layer

From: Gabriel Krisman Bertazi
Date: Sat Mar 13 2021 - 20:50:31 EST

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In reply to: Shreeya Patel: "[PATCH 3/3] fs: unicode: Add utf8 module and a unicode layer"
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Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx> writes:

> utf8data.h_shipped has a large database table which is an auto-generated
> decodification trie for the unicode normalization functions.
> It is not necessary to carry this large table in the kernel hence make
> UTF-8 encoding loadable by converting it into a module.
> Also, modify the file called unicode-core which will act as a layer for
> unicode subsystem. It will load the UTF-8 module and access it's functions
> whenever any filesystem that needs unicode is mounted.
>
> Signed-off-by: Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx>

Hi Shreeya,

> ---
> fs/unicode/Kconfig | 7 +-
> fs/unicode/Makefile | 5 +-
> fs/unicode/unicode-core.c | 201 ++++++-------------------------
> fs/unicode/utf8-core.c | 112 +++++++++++++++++
> fs/unicode/utf8mod.c | 246 ++++++++++++++++++++++++++++++++++++++
> include/linux/unicode.h | 20 ++++
> 6 files changed, 427 insertions(+), 164 deletions(-)
> create mode 100644 fs/unicode/utf8-core.c
> create mode 100644 fs/unicode/utf8mod.c
>
> diff --git a/fs/unicode/Kconfig b/fs/unicode/Kconfig
> index 2c27b9a5cd6c..33a27deef729 100644
> --- a/fs/unicode/Kconfig
> +++ b/fs/unicode/Kconfig
> @@ -8,7 +8,12 @@ config UNICODE
> Say Y here to enable UTF-8 NFD normalization and NFD+CF casefolding
> support.
>
> +config UNICODE_UTF8
> + tristate "UTF-8 module"
> + depends on UNICODE
> + default m
> +
> config UNICODE_NORMALIZATION_SELFTEST
> tristate "Test UTF-8 normalization support"
> - depends on UNICODE
> + depends on UNICODE_UTF8
> default n
> diff --git a/fs/unicode/Makefile b/fs/unicode/Makefile
> index fbf9a629ed0d..9dbb04194b32 100644
> --- a/fs/unicode/Makefile
> +++ b/fs/unicode/Makefile
> @@ -1,11 +1,14 @@
> # SPDX-License-Identifier: GPL-2.0
>
> obj-$(CONFIG_UNICODE) += unicode.o
> +obj-$(CONFIG_UNICODE_UTF8) += utf8.o
> obj-$(CONFIG_UNICODE_NORMALIZATION_SELFTEST) += utf8-selftest.o
>
> -unicode-y := utf8-norm.o unicode-core.o
> +unicode-y := unicode-core.o
> +utf8-y := utf8mod.o utf8-norm.o
>
> $(obj)/utf8-norm.o: $(obj)/utf8data.h
> +$(obj)/utf8mod.o: $(obj)/utf8-norm.o
>
> # In the normal build, the checked-in utf8data.h is just shipped.
> #
> diff --git a/fs/unicode/unicode-core.c b/fs/unicode/unicode-core.c
> index d5f09e022ac5..b832341f1e7b 100644
> --- a/fs/unicode/unicode-core.c
> +++ b/fs/unicode/unicode-core.c
> @@ -7,70 +7,29 @@
> #include <linux/errno.h>
> #include <linux/unicode.h>
> #include <linux/stringhash.h>
> +#include <linux/delay.h>
>
> -#include "utf8n.h"
> +struct unicode_ops *utf8_ops;
> +
> +static int unicode_load_module(void);

This is unnecessary
>
> int unicode_validate(const struct unicode_map *um, const struct qstr *str)
> {
> - const struct utf8data *data = utf8nfdi(um->version);
> -
> - if (utf8nlen(data, str->name, str->len) < 0)
> - return -1;
> - return 0;
> + return utf8_ops->validate(um, str);
> }
> EXPORT_SYMBOL(unicode_validate);
>
> int unicode_strncmp(const struct unicode_map *um,
> const struct qstr *s1, const struct qstr *s2)
> {
> - const struct utf8data *data = utf8nfdi(um->version);
> - struct utf8cursor cur1, cur2;
> - int c1, c2;
> -
> - if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> - return -EINVAL;
> -
> - if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
> - return -EINVAL;
> -
> - do {
> - c1 = utf8byte(&cur1);
> - c2 = utf8byte(&cur2);
> -
> - if (c1 < 0 || c2 < 0)
> - return -EINVAL;
> - if (c1 != c2)
> - return 1;
> - } while (c1);
> -
> - return 0;
> + return utf8_ops->strncmp(um, s1, s2);
> }

I think these would go on a header file and inlined.

> EXPORT_SYMBOL(unicode_strncmp);
>
> int unicode_strncasecmp(const struct unicode_map *um,
> const struct qstr *s1, const struct qstr *s2)
> {
> - const struct utf8data *data = utf8nfdicf(um->version);
> - struct utf8cursor cur1, cur2;
> - int c1, c2;
> -
> - if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> - return -EINVAL;
> -
> - if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
> - return -EINVAL;
> -
> - do {
> - c1 = utf8byte(&cur1);
> - c2 = utf8byte(&cur2);
> -
> - if (c1 < 0 || c2 < 0)
> - return -EINVAL;
> - if (c1 != c2)
> - return 1;
> - } while (c1);
> -
> - return 0;
> + return utf8_ops->strncasecmp(um, s1, s2);
> }
> EXPORT_SYMBOL(unicode_strncasecmp);
>
> @@ -81,155 +40,73 @@ int unicode_strncasecmp_folded(const struct unicode_map *um,
> const struct qstr *cf,
> const struct qstr *s1)
> {
> - const struct utf8data *data = utf8nfdicf(um->version);
> - struct utf8cursor cur1;
> - int c1, c2;
> - int i = 0;
> -
> - if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> - return -EINVAL;
> -
> - do {
> - c1 = utf8byte(&cur1);
> - c2 = cf->name[i++];
> - if (c1 < 0)
> - return -EINVAL;
> - if (c1 != c2)
> - return 1;
> - } while (c1);
> -
> - return 0;
> + return utf8_ops->strncasecmp_folded(um, cf, s1);
> }
> EXPORT_SYMBOL(unicode_strncasecmp_folded);
>
> int unicode_casefold(const struct unicode_map *um, const struct qstr *str,
> unsigned char *dest, size_t dlen)
> {
> - const struct utf8data *data = utf8nfdicf(um->version);
> - struct utf8cursor cur;
> - size_t nlen = 0;
> -
> - if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> - return -EINVAL;
> -
> - for (nlen = 0; nlen < dlen; nlen++) {
> - int c = utf8byte(&cur);
> -
> - dest[nlen] = c;
> - if (!c)
> - return nlen;
> - if (c == -1)
> - break;
> - }
> - return -EINVAL;
> + return utf8_ops->casefold(um, str, dest, dlen);
> }
> EXPORT_SYMBOL(unicode_casefold);
>
> int unicode_casefold_hash(const struct unicode_map *um, const void *salt,
> struct qstr *str)
> {
> - const struct utf8data *data = utf8nfdicf(um->version);
> - struct utf8cursor cur;
> - int c;
> - unsigned long hash = init_name_hash(salt);
> -
> - if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> - return -EINVAL;
> -
> - while ((c = utf8byte(&cur))) {
> - if (c < 0)
> - return -EINVAL;
> - hash = partial_name_hash((unsigned char)c, hash);
> - }
> - str->hash = end_name_hash(hash);
> - return 0;
> + return utf8_ops->casefold_hash(um, salt, str);
> }
> EXPORT_SYMBOL(unicode_casefold_hash);
>
> int unicode_normalize(const struct unicode_map *um, const struct qstr *str,
> unsigned char *dest, size_t dlen)
> {
> - const struct utf8data *data = utf8nfdi(um->version);
> - struct utf8cursor cur;
> - ssize_t nlen = 0;
> + return utf8_ops->normalize(um, str, dest, dlen);
> +}
> +EXPORT_SYMBOL(unicode_normalize);
>
> - if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> - return -EINVAL;
> +struct unicode_map *unicode_load(const char *version)
> +{
> + int ret = unicode_load_module();
>
> - for (nlen = 0; nlen < dlen; nlen++) {
> - int c = utf8byte(&cur);
> + if (ret)
> + return ERR_PTR(ret);
>
> - dest[nlen] = c;
> - if (!c)
> - return nlen;
> - if (c == -1)
> - break;
> - }
> - return -EINVAL;
> + else
> + return utf8_ops->load(version);
> }
> -EXPORT_SYMBOL(unicode_normalize);
> +EXPORT_SYMBOL(unicode_load);
>
> -static int unicode_parse_version(const char *version, unsigned int *maj,
> - unsigned int *min, unsigned int *rev)
> +void unicode_unload(struct unicode_map *um)
> {
> - substring_t args[3];
> - char version_string[12];
> - static const struct match_token token[] = {
> - {1, "%d.%d.%d"},
> - {0, NULL}
> - };
> + kfree(um);
> +}
> +EXPORT_SYMBOL(unicode_unload);
>
> - strncpy(version_string, version, sizeof(version_string));
> +static int unicode_load_module(void)
> +{
> + int ret = request_module("utf8");
>
> - if (match_token(version_string, token, args) != 1)
> - return -EINVAL;
> + msleep(100);

I think I misunderstood when you mentioned you did this msleep. It was
ok to debug the issue you were observing, but it is not a solution.
Setting an arbitrary amount of time will either waste time, or you can
still fail if things take longer than expected. There are mechanisms to
load and wait on a module. See how fs/nls/nls_base.c do exactly this.

> - if (match_int(&args[0], maj) || match_int(&args[1], min) ||
> - match_int(&args[2], rev))
> - return -EINVAL;
> + if (ret) {
> + pr_err("Failed to load UTF-8 module\n");
> + return ret;
> + }
>
> return 0;
> }
>
> -struct unicode_map *unicode_load(const char *version)
> +void unicode_register(struct unicode_ops *ops)
> {
> - struct unicode_map *um = NULL;
> - int unicode_version;
> -
> - if (version) {
> - unsigned int maj, min, rev;
> -
> - if (unicode_parse_version(version, &maj, &min, &rev) < 0)
> - return ERR_PTR(-EINVAL);
> -
> - if (!utf8version_is_supported(maj, min, rev))
> - return ERR_PTR(-EINVAL);
> -
> - unicode_version = UNICODE_AGE(maj, min, rev);
> - } else {
> - unicode_version = utf8version_latest();
> - printk(KERN_WARNING"UTF-8 version not specified. "
> - "Assuming latest supported version (%d.%d.%d).",
> - (unicode_version >> 16) & 0xff,
> - (unicode_version >> 8) & 0xff,
> - (unicode_version & 0xff));
> - }
> -
> - um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL);
> - if (!um)
> - return ERR_PTR(-ENOMEM);
> -
> - um->charset = "UTF-8";
> - um->version = unicode_version;
> -
> - return um;
> + utf8_ops = ops;
> }
> -EXPORT_SYMBOL(unicode_load);
> +EXPORT_SYMBOL(unicode_register);
>
> -void unicode_unload(struct unicode_map *um)
> +void unicode_unregister(void)
> {
> - kfree(um);
> + utf8_ops = NULL;
> }
> -EXPORT_SYMBOL(unicode_unload);
> +EXPORT_SYMBOL(unicode_unregister);
>
> MODULE_LICENSE("GPL v2");
> diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
> new file mode 100644
> index 000000000000..009faa68330c
> --- /dev/null
> +++ b/fs/unicode/utf8-core.c
> @@ -0,0 +1,112 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <linux/slab.h>
> +#include <linux/parser.h>
> +#include <linux/errno.h>
> +#include <linux/unicode.h>
> +#include <linux/stringhash.h>
> +#include <linux/delay.h>
> +
> +struct unicode_ops *utf8_ops;
> +
> +static int unicode_load_module(void);
> +
> +int unicode_validate(const struct unicode_map *um, const struct qstr *str)
> +{
> + return utf8_ops->validate(um, str);
> +}
> +EXPORT_SYMBOL(unicode_validate);
> +
> +int unicode_strncmp(const struct unicode_map *um,
> + const struct qstr *s1, const struct qstr *s2)
> +{
> + return utf8_ops->strncmp(um, s1, s2);
> +}
> +EXPORT_SYMBOL(unicode_strncmp);

I'm confused now. Isn't this redefining unicode_strncmp ? It was
defined in unicode_core.c on the hunk above and now it is redefined on
utf8_core.c. There is something odd here.

> +
> +int unicode_strncasecmp(const struct unicode_map *um,
> + const struct qstr *s1, const struct qstr *s2)
> +{
> + return utf8_ops->strncasecmp(um, s1, s2);
> +}
> +EXPORT_SYMBOL(unicode_strncasecmp);
> +
> +/* String cf is expected to be a valid UTF-8 casefolded
> + * string.
> + */
> +int unicode_strncasecmp_folded(const struct unicode_map *um,
> + const struct qstr *cf,
> + const struct qstr *s1)
> +{
> + return utf8_ops->strncasecmp_folded(um, cf, s1);
> +}
> +EXPORT_SYMBOL(unicode_strncasecmp_folded);
> +
> +int unicode_casefold(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen)
> +{
> + return utf8_ops->casefold(um, str, dest, dlen);
> +}
> +EXPORT_SYMBOL(unicode_casefold);
> +
> +int unicode_casefold_hash(const struct unicode_map *um, const void *salt,
> + struct qstr *str)
> +{
> + return utf8_ops->casefold_hash(um, salt, str);
> +}
> +EXPORT_SYMBOL(unicode_casefold_hash);
> +
> +int unicode_normalize(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen)
> +{
> + return utf8_ops->normalize(um, str, dest, dlen);
> +}
> +EXPORT_SYMBOL(unicode_normalize);
> +
> +struct unicode_map *unicode_load(const char *version)
> +{
> + int ret = unicode_load_module();
> +
> + if (ret)
> + return ERR_PTR(ret);
> +
> + else
> + return utf8_ops->load(version);
> +}
> +EXPORT_SYMBOL(unicode_load);
> +
> +void unicode_unload(struct unicode_map *um)
> +{
> + kfree(um);
> +}
> +EXPORT_SYMBOL(unicode_unload);
> +
> +void unicode_register(struct unicode_ops *ops)
> +{
> + utf8_ops = ops;
> +}
> +EXPORT_SYMBOL(unicode_register);
> +
> +void unicode_unregister(void)
> +{
> + utf8_ops = NULL;
> +}
> +EXPORT_SYMBOL(unicode_unregister);
> +
> +static int unicode_load_module(void)
> +{
> + int ret = request_module("utf8");
> +
> + msleep(100);
> +
> + if (ret) {
> + pr_err("Failed to load UTF-8 module\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +MODULE_LICENSE("GPL v2");
> diff --git a/fs/unicode/utf8mod.c b/fs/unicode/utf8mod.c
> new file mode 100644
> index 000000000000..8eaeeb27255c
> --- /dev/null
> +++ b/fs/unicode/utf8mod.c
> @@ -0,0 +1,246 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <linux/slab.h>
> +#include <linux/parser.h>
> +#include <linux/errno.h>
> +#include <linux/unicode.h>
> +#include <linux/stringhash.h>
> +
> +#include "utf8n.h"
> +
> +static int utf8_validate(const struct unicode_map *um, const struct qstr *str)
> +{
> + const struct utf8data *data = utf8nfdi(um->version);
> +
> + if (utf8nlen(data, str->name, str->len) < 0)
> + return -1;
> + return 0;
> +}
> +
> +static int utf8_strncmp(const struct unicode_map *um,
> + const struct qstr *s1, const struct qstr *s2)
> +{
> + const struct utf8data *data = utf8nfdi(um->version);
> + struct utf8cursor cur1, cur2;
> + int c1, c2;
> +
> + if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> + return -EINVAL;
> +
> + if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
> + return -EINVAL;
> +
> + do {
> + c1 = utf8byte(&cur1);
> + c2 = utf8byte(&cur2);
> +
> + if (c1 < 0 || c2 < 0)
> + return -EINVAL;
> + if (c1 != c2)
> + return 1;
> + } while (c1);
> +
> + return 0;
> +}
> +
> +static int utf8_strncasecmp(const struct unicode_map *um,
> + const struct qstr *s1, const struct qstr *s2)
> +{
> + const struct utf8data *data = utf8nfdicf(um->version);
> + struct utf8cursor cur1, cur2;
> + int c1, c2;
> +
> + if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> + return -EINVAL;
> +
> + if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
> + return -EINVAL;
> +
> + do {
> + c1 = utf8byte(&cur1);
> + c2 = utf8byte(&cur2);
> +
> + if (c1 < 0 || c2 < 0)
> + return -EINVAL;
> + if (c1 != c2)
> + return 1;
> + } while (c1);
> +
> + return 0;
> +}
> +
> +/* String cf is expected to be a valid UTF-8 casefolded
> + * string.
> + */
> +static int utf8_strncasecmp_folded(const struct unicode_map *um,
> + const struct qstr *cf,
> + const struct qstr *s1)
> +{
> + const struct utf8data *data = utf8nfdicf(um->version);
> + struct utf8cursor cur1;
> + int c1, c2;
> + int i = 0;
> +
> + if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
> + return -EINVAL;
> +
> + do {
> + c1 = utf8byte(&cur1);
> + c2 = cf->name[i++];
> + if (c1 < 0)
> + return -EINVAL;
> + if (c1 != c2)
> + return 1;
> + } while (c1);
> +
> + return 0;
> +}
> +
> +static int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen)
> +{
> + const struct utf8data *data = utf8nfdicf(um->version);
> + struct utf8cursor cur;
> + size_t nlen = 0;
> +
> + if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> + return -EINVAL;
> +
> + for (nlen = 0; nlen < dlen; nlen++) {
> + int c = utf8byte(&cur);
> +
> + dest[nlen] = c;
> + if (!c)
> + return nlen;
> + if (c == -1)
> + break;
> + }
> + return -EINVAL;
> +}
> +
> +static int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
> + struct qstr *str)
> +{
> + const struct utf8data *data = utf8nfdicf(um->version);
> + struct utf8cursor cur;
> + int c;
> + unsigned long hash = init_name_hash(salt);
> +
> + if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> + return -EINVAL;
> +
> + while ((c = utf8byte(&cur))) {
> + if (c < 0)
> + return -EINVAL;
> + hash = partial_name_hash((unsigned char)c, hash);
> + }
> + str->hash = end_name_hash(hash);
> + return 0;
> +}
> +
> +static int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen)
> +{
> + const struct utf8data *data = utf8nfdi(um->version);
> + struct utf8cursor cur;
> + ssize_t nlen = 0;
> +
> + if (utf8ncursor(&cur, data, str->name, str->len) < 0)
> + return -EINVAL;
> +
> + for (nlen = 0; nlen < dlen; nlen++) {
> + int c = utf8byte(&cur);
> +
> + dest[nlen] = c;
> + if (!c)
> + return nlen;
> + if (c == -1)
> + break;
> + }
> + return -EINVAL;
> +}
> +
> +static int utf8_parse_version(const char *version, unsigned int *maj,
> + unsigned int *min, unsigned int *rev)
> +{
> + substring_t args[3];
> + char version_string[12];
> + static const struct match_token token[] = {
> + {1, "%d.%d.%d"},
> + {0, NULL}
> + };
> +
> + strncpy(version_string, version, sizeof(version_string));
> +
> + if (match_token(version_string, token, args) != 1)
> + return -EINVAL;
> +
> + if (match_int(&args[0], maj) || match_int(&args[1], min) ||
> + match_int(&args[2], rev))
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static struct unicode_map *utf8_load(const char *version)
> +{
> + struct unicode_map *um = NULL;
> + int unicode_version;
> +
> + if (version) {
> + unsigned int maj, min, rev;
> +
> + if (utf8_parse_version(version, &maj, &min, &rev) < 0)
> + return ERR_PTR(-EINVAL);
> +
> + if (!utf8version_is_supported(maj, min, rev))
> + return ERR_PTR(-EINVAL);
> +
> + unicode_version = UNICODE_AGE(maj, min, rev);
> + } else {
> + unicode_version = utf8version_latest();
> + printk(KERN_WARNING"UTF-8 version not specified. "
> + "Assuming latest supported version (%d.%d.%d).",
> + (unicode_version >> 16) & 0xff,
> + (unicode_version >> 8) & 0xff,
> + (unicode_version & 0xff));
> + }
> +
> + um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL);
> + if (!um)
> + return ERR_PTR(-ENOMEM);
> +
> + um->charset = "UTF-8";
> + um->version = unicode_version;
> +
> + return um;
> +}
> +
> +static struct unicode_ops ops = {
> + .validate = utf8_validate,
> + .strncmp = utf8_strncmp,
> + .strncasecmp = utf8_strncasecmp,
> + .strncasecmp_folded = utf8_strncasecmp_folded,
> + .casefold = utf8_casefold,
> + .casefold_hash = utf8_casefold_hash,
> + .normalize = utf8_normalize,
> + .load = utf8_load,
> +};
> +
> +static int __init utf8_init(void)
> +{
> + unicode_register(&ops);
> + return 0;
> +}
> +
> +static void __exit utf8_exit(void)
> +{
> + unicode_unregister();
> +}
> +
> +module_init(utf8_init);
> +module_exit(utf8_exit);
> +
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/unicode.h b/include/linux/unicode.h
> index de23f9ee720b..b0d59069e438 100644
> --- a/include/linux/unicode.h
> +++ b/include/linux/unicode.h
> @@ -10,6 +10,23 @@ struct unicode_map {
> int version;
> };
>
> +struct unicode_ops {
> + int (*validate)(const struct unicode_map *um, const struct qstr *str);
> + int (*strncmp)(const struct unicode_map *um, const struct qstr *s1,
> + const struct qstr *s2);
> + int (*strncasecmp)(const struct unicode_map *um, const struct qstr *s1,
> + const struct qstr *s2);
> + int (*strncasecmp_folded)(const struct unicode_map *um, const struct qstr *cf,
> + const struct qstr *s1);
> + int (*normalize)(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen);
> + int (*casefold)(const struct unicode_map *um, const struct qstr *str,
> + unsigned char *dest, size_t dlen);
> + int (*casefold_hash)(const struct unicode_map *um, const void *salt,
> + struct qstr *str);
> + struct unicode_map* (*load)(const char *version);
> +};

Also, make sure you run checkpatch.pl on the patch series before
submitting.

> +
> int unicode_validate(const struct unicode_map *um, const struct qstr *str);
>
> int unicode_strncmp(const struct unicode_map *um,
> @@ -33,4 +50,7 @@ int unicode_casefold_hash(const struct unicode_map *um, const void *salt,
> struct unicode_map *unicode_load(const char *version);
> void unicode_unload(struct unicode_map *um);
>
> +void unicode_register(struct unicode_ops *ops);
> +void unicode_unregister(void);
> +
> #endif /* _LINUX_UNICODE_H */

--
Gabriel Krisman Bertazi

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