[lkml]   [2019]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH-next 07/20] gpio: gpio-omap: simplify omap_gpio_get_direction()
On Mon, Jun 10, 2019 at 7:12 PM Grygorii Strashko
<> wrote:

> From: Russell King <>
> Architectures are single-copy atomic, which means that simply reading
> a register is an inherently atomic operation. There is no need to
> take a spinlock here.
> Signed-off-by: Russell King <>
> Signed-off-by: Grygorii Strashko <>

Patch applied.

This makes me wonder how many more instances we have
of this kind of mistake in the kernel :/ I guess it is mostly
harmless but it sure makes for massive code complexity.

I would sure like e.g. drivers/gpio/gpio-mmio.c to avoid
taking locks on architectures where this is not a problem
given it is used on a plethora of architectures.

Linus Walleij

 \ /
  Last update: 2019-06-12 10:48    [W:0.119 / U:0.096 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site