The patch titled
Subject: lib/cmdline: allow NULL to be an output for get_option()
has been added to the -mm tree. Its filename is
lib-cmdline-allow-null-to-be-an-output-for-get_option.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/lib-cmdline-allow-null-to-be-an-output-for-get_option.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/lib-cmdline-allow-null-to-be-an-output-for-get_option.patch
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------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Subject: lib/cmdline: allow NULL to be an output for get_option()
In the future we would like to use get_option() to only validate the
string and parse it separately. To achieve this, allow NULL to be an
output for get_option().
Link: https://lkml.kernel.org/r/20201112180732.75589-5-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Cc: David Gow <davidgow@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: Vitor Massaru Iha <vitor@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/cmdline.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/lib/cmdline.c~lib-cmdline-allow-null-to-be-an-output-for-get_option
+++ a/lib/cmdline.c
@@ -35,11 +35,14 @@ static int get_range(char **str, int *pi
/**
* get_option - Parse integer from an option string
* @str: option string
- * @pint: (output) integer value parsed from @str
+ * @pint: (optional output) integer value parsed from @str
*
* Read an int from an option string; if available accept a subsequent
* comma as well.
*
+ * When @pint is NULL the function can be used as a validator of
+ * the current option in the string.
+ *
* Return values:
* 0 - no int in string
* 1 - int found, no subsequent comma
@@ -53,13 +56,16 @@ static int get_range(char **str, int *pi
int get_option(char **str, int *pint)
{
char *cur = *str;
+ int value;
if (!cur || !(*cur))
return 0;
if (*cur == '-')
- *pint = -simple_strtoull(++cur, str, 0);
+ value = -simple_strtoull(++cur, str, 0);
else
- *pint = simple_strtoull(cur, str, 0);
+ value = simple_strtoull(cur, str, 0);
+ if (pint)
+ *pint = value;
if (cur == *str)
return 0;
if (**str == ',') {
_
Patches currently in -mm which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are
kernelh-split-out-mathematical-helpers.patch
bitmap-convert-bitmap_empty-bitmap_full-to-return-boolean.patch
lib-list_kunit-follow-new-file-name-convention-for-kunit-tests.patch
lib-linear_ranges_kunit-follow-new-file-name-convention-for-kunit-tests.patch
lib-bits_kunit-follow-new-file-name-convention-for-kunit-tests.patch
lib-cmdline-fix-get_option-for-strings-starting-with-hyphen.patch
lib-cmdline-allow-null-to-be-an-output-for-get_option.patch
lib-cmdline_kunit-add-a-new-test-suite-for-cmdline-api.patch
