[PATCH 1/2] lib/cmdline: add new function get_option_ull()

[PATCH 1/2] lib/cmdline: add new function get_option_ull()

[Wesley Zhao]

From: "Wesley.Zhao" <zhaowei1102@thundersoft.com>

In the future we would pass the unsigned long long parameter
like(0x123456781234) in cmdline on the 64bit platform, so add a new
option parse function get_option_ull()

Signed-off-by: Wesley.Zhao <zhaowei1102@thundersoft.com>
---
 include/linux/kernel.h |  1 +
 lib/cmdline.c          | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f7902d8..5568133 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -348,6 +348,7 @@ extern __scanf(2, 0)
 int vsscanf(const char *, const char *, va_list);
 
 extern int get_option(char **str, int *pint);
+extern int get_option_ull(char **str, unsigned long long *pull);
 extern char *get_options(const char *str, int nints, int *ints);
 extern unsigned long long memparse(const char *ptr, char **retptr);
 extern bool parse_option_str(const char *str, const char *option);
diff --git a/lib/cmdline.c b/lib/cmdline.c
index b390dd0..2d089a2 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -80,6 +80,41 @@ int get_option(char **str, int *pint)
 EXPORT_SYMBOL(get_option);
 
 /**
+ *	get_option_ull - Parse unsigned long long from an option string
+ *	@str: option string
+ *	@pull: (output) unsigned long long value parsed from @str
+ *
+ *	Read an unsigned long long from an option string; if available accept a subsequent
+ *	comma as well.
+ *
+ *	Return values:
+ *	0 - no ull in string
+ *	1 - ull found, no subsequent comma
+ *	2 - ull found including a subsequent comma
+ *	3 - hyphen found to denote a range
+ */
+
+int get_option_ull(char **str, unsigned long long *pull)
+{
+	char *cur = *str;
+
+	if (!cur || !(*cur))
+		return 0;
+	*pull = simple_strtoull(cur, str, 0);
+	if (cur == *str)
+		return 0;
+	if (**str == ',') {
+		(*str)++;
+		return 2;
+	}
+	if (**str == '-')
+		return 3;
+
+	return 1;
+}
+EXPORT_SYMBOL(get_option_ull);
+
+/**
  *	get_options - Parse a string into a list of integers
  *	@str: String to be parsed
  *	@nints: size of integer array
-- 
2.7.4

[PATCH 2/2] resource: Make it possible to reserve memory on 64bit platform

[Wesley Zhao]

From: "Wesley.Zhao" <zhaowei1102@thundersoft.com>

For now "reserve=" is limitied to 32bit,not available on 64bit
platform,so we change the get_option() to get_option_ull(added in
patch: commit 4b6bfe96265e ("lib/cmdline: add new function
get_option_ull()"))

Signed-off-by: Wesley.Zhao <zhaowei1102@thundersoft.com>
---
 kernel/resource.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 833394f..ee2a0e5 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1567,13 +1567,13 @@ static int __init reserve_setup(char *str)
 	static struct resource reserve[MAXRESERVE];
 
 	for (;;) {
-		unsigned int io_start, io_num;
+		unsigned long long io_start, io_num;
 		int x = reserved;
 		struct resource *parent;
 
-		if (get_option(&str, &io_start) != 2)
+		if (get_option_ull(&str, &io_start) != 2)
 			break;
-		if (get_option(&str, &io_num) == 0)
+		if (get_option_ull(&str, &io_num) == 0)
 			break;
 		if (x < MAXRESERVE) {
 			struct resource *res = reserve + x;
-- 
2.7.4

Re: [PATCH 1/2] lib/cmdline: add new function get_option_ull()

[Andy Shevchenko]

On Mon, Jan 11, 2021 at 08:33:17AM -0800, Wesley Zhao wrote:
> From: "Wesley.Zhao" <zhaowei1102@thundersoft.com>
> 
> In the future we would pass the unsigned long long parameter
> like(0x123456781234) in cmdline on the 64bit platform, so add a new
> option parse function get_option_ull()

No negative numbers?
No test cases?
No user?

Please, address above.

Besides that, consider to deduplicate (like it's done in simple_strto*() family
of functions), so we don't have two implementation that are basically do the
same, only put result to a different type of variable.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 2/2] resource: Make it possible to reserve memory on 64bit platform

[David Hildenbrand]

On 11.01.21 17:33, Wesley Zhao wrote:
> From: "Wesley.Zhao" <zhaowei1102@thundersoft.com>
> 
> For now "reserve=" is limitied to 32bit,not available on 64bit
> platform,so we change the get_option() to get_option_ull(added in
> patch: commit 4b6bfe96265e ("lib/cmdline: add new function
> get_option_ull()"))

Curious, what's the target use case? (did not receive a cover letter,
maybe it's buried in there)

-- 
Thanks,

David / dhildenb

Re: [PATCH 2/2] resource: Make it possible to reserve memory on 64bit platform

[Andy Shevchenko]

On Mon, Jan 11, 2021 at 06:24:35PM +0100, David Hildenbrand wrote:
> On 11.01.21 17:33, Wesley Zhao wrote:
> > From: "Wesley.Zhao" <zhaowei1102@thundersoft.com>
> > 
> > For now "reserve=" is limitied to 32bit,not available on 64bit
> > platform,so we change the get_option() to get_option_ull(added in
> > patch: commit 4b6bfe96265e ("lib/cmdline: add new function
> > get_option_ull()"))
> 
> Curious, what's the target use case? (did not receive a cover letter,
> maybe it's buried in there)


Oh, I didn't received neither cover letter nor patch 2!

To author: please, address comments to patch 1 along with (re)sending cover
letter and include every stakeholder to the entire series.

-- 
With Best Regards,
Andy Shevchenko