[PATCH] gpio: use raw spinlock for gpio chip shadowed data
Andy Shevchenko
andy.shevchenko at gmail.com
Mon Apr 18 04:38:24 PDT 2022
On Mon, Apr 18, 2022 at 6:07 AM Schspa Shi <schspa at gmail.com> wrote:
> Andy Shevchenko <andy.shevchenko at gmail.com> writes:
...
> > drivers/gpio/gpio-mmio.c | 22 +++++++++++-----------
> > include/linux/gpio/driver.h | 2 +-
> >
> > You can’t do it for one driver only. As I told it will require too much of additional churn to make this to be series.
> >
>
> It seems I have misunderstood your "too much of additional churn". Can
> you explain it?
> The gpio-mmio.c and driver.h here are the basics of other gpio
> drivers. In my opinion, these two files
> belong to the basic code of gpio, and functions such as bgpio_init are
> declared in
> include/linux/gpio/driver.h and implemented in
> drivers/gpio/gpio-mmio.c. So there is no churn.
When you change the member of the data structure, you have to change
all its users. You can't change only one at a time because it will be
a (compile-time) bisectability issue.
--
With Best Regards,
Andy Shevchenko
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