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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
Download patch file Download diff file Expand all files Collapse all files

21
kernel/params.c
View file

@ -67,20 +67,27 @@ static void maybe_kfree_parameter(void *param)
}
}
static inline char dash2underscore(char c)
static char dash2underscore(char c)
{
if (c == '-')
return '_';
return c;
}
static inline int parameq(const char *input, const char *paramname)
bool parameqn(const char *a, const char *b, size_t n)
{
unsigned int i;
for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)
if (input[i] == '\0')
return 1;
return 0;
size_t i;
for (i = 0; i < n; i++) {
if (dash2underscore(a[i]) != dash2underscore(b[i]))
return false;
}
return true;
}
bool parameq(const char *a, const char *b)
{
return parameqn(a, b, strlen(a)+1);
}
static int parse_one(char *param,