[PATCH v2] stacktrace: cleanup inconsistent variable type

[PATCH v2] stacktrace: cleanup inconsistent variable type

[Walter Wu]

Modify the variable type of 'skip' member of struct stack_trace.
In theory, the 'skip' variable type should be unsigned int.
There are two reasons:
- The 'skip' only has two situation, 1)Positive value, 2)Zero
- The 'skip' of struct stack_trace has inconsistent type with struct
  stack_trace_data, it makes a bit confusion in the relationship between
  struct stack_trace and stack_trace_data.

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
changes in v2:
modify the commit log to describe the matter more clearly.

---
 include/linux/stacktrace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index 83bd8cb475d7..b7af8cc13eda 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -64,7 +64,7 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
 struct stack_trace {
 	unsigned int nr_entries, max_entries;
 	unsigned long *entries;
-	int skip;	/* input argument: How many entries to skip */
+	unsigned int skip;	/* input argument: How many entries to skip */
 };
 
 extern void save_stack_trace(struct stack_trace *trace);
-- 
2.18.0

Re: [PATCH v2] stacktrace: cleanup inconsistent variable type

[Bart Van Assche]

On 4/20/20 6:35 PM, Walter Wu wrote:
> Modify the variable type of 'skip' member of struct stack_trace.
> In theory, the 'skip' variable type should be unsigned int.
> There are two reasons:
> - The 'skip' only has two situation, 1)Positive value, 2)Zero
> - The 'skip' of struct stack_trace has inconsistent type with struct
>    stack_trace_data, it makes a bit confusion in the relationship between
>    struct stack_trace and stack_trace_data.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH v2] stacktrace: cleanup inconsistent variable type

[Walter Wu]

On Wed, 2020-04-22 at 18:21 -0700, Bart Van Assche wrote:
> On 4/20/20 6:35 PM, Walter Wu wrote:
> > Modify the variable type of 'skip' member of struct stack_trace.
> > In theory, the 'skip' variable type should be unsigned int.
> > There are two reasons:
> > - The 'skip' only has two situation, 1)Positive value, 2)Zero
> > - The 'skip' of struct stack_trace has inconsistent type with struct
> >    stack_trace_data, it makes a bit confusion in the relationship between
> >    struct stack_trace and stack_trace_data.
> 
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Hi Andrew,

Would you know why not to be picked up this patch yet?
Do I miss somethings?


Thank you for your help.

Walter

Re: [PATCH v2] stacktrace: cleanup inconsistent variable type

[Andrew Morton]

On Wed, 6 May 2020 10:18:24 +0800 Walter Wu <walter-zh.wu@mediatek.com> wrote:

> On Wed, 2020-04-22 at 18:21 -0700, Bart Van Assche wrote:
> > On 4/20/20 6:35 PM, Walter Wu wrote:
> > > Modify the variable type of 'skip' member of struct stack_trace.
> > > In theory, the 'skip' variable type should be unsigned int.
> > > There are two reasons:
> > > - The 'skip' only has two situation, 1)Positive value, 2)Zero
> > > - The 'skip' of struct stack_trace has inconsistent type with struct
> > >    stack_trace_data, it makes a bit confusion in the relationship between
> > >    struct stack_trace and stack_trace_data.
> > 
> > Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> 
> Hi Andrew,
> 
> Would you know why not to be picked up this patch yet?
> Do I miss somethings?

I'd decided to pass on this because it's so minor.  We inappropriately
use signed types in soooo many places :(