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params: make dashes and underscores in parameter names truly equal

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The user may use "foo-bar" for a kernel parameter defined as "foo_bar".
Make sure it works the other way around too.

Apply the equality of dashes and underscores on early_params and __setup
params as well.

The example given in Documentation/kernel-parameters.txt indicates that
this is the intended behaviour.

With the patch the kernel accepts "log-buf-len=1M" as expected.
https://bugzilla.redhat.com/show_bug.cgi?id=744545

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (neatened implementations)
This commit is contained in:
Michal Schmidt 2011-10-10 00:03:37 +02:00 • committed by Rusty Russell
parent 37252db6aa
commit b1e4d20cbf
3 changed files with 36 additions and 9 deletions
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20
include/linux/moduleparam.h
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@ -262,6 +262,26 @@ static inline void __kernel_param_unlock(void)
.str = &__param_string_##name, 0, perm); \
__MODULE_PARM_TYPE(name, "string")
/**
* parameq - checks if two parameter names match
* @name1: parameter name 1
* @name2: parameter name 2
*
* Returns true if the two parameter names are equal.
* Dashes (-) are considered equal to underscores (_).
*/
extern bool parameq(const char *name1, const char *name2);
/**
* parameqn - checks if two parameter names match
* @name1: parameter name 1
* @name2: parameter name 2
* @n: the length to compare
*
* Similar to parameq(), except it compares @n characters.
*/
extern bool parameqn(const char *name1, const char *name2, size_t n);
/* Called on module insert or kernel boot */
extern int parse_args(const char *name,
char *args,