On Thu, 4 Apr 2019, Linus Torvalds wrote:
> On Wed, Apr 3, 2019 at 9:28 AM Mikulas Patocka wrote:
> >
> > So, I submit this patch that adds 1us delay between any I/O accesses
> > directed at the ISA bus. This patch makes my machine boot. 1us seems to be
> > minimal acceptable value, with
On Thu, 4 Apr 2019, Maciej W. Rozycki wrote:
> On Wed, 3 Apr 2019, Mikulas Patocka wrote:
>
> > I did some more testing and it turns out that mb() is not entirely
> > sufficient to prevent the boot hang. mb()'s latecy varies, sometimes it is
> > sufficient, sometimes not.
> >
> > So, I
Alpha incorrectly reports "0070-0080 : rtc" in /proc/ioports.
Fix this, so that it is "0070-007f".
Signed-off-by: Mikulas Patocka
---
arch/alpha/kernel/setup.c |2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-stable/arch/alpha/kernel/setup.c
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On 4/5/2019 1:29 PM, Maciej W. Rozycki wrote:
Obviously you do need that `mb' before `__ioread' in the second case,
just like in the first one, because otherwise the read bus access issued
by `__ioread' can be reordered ahead of the write bus access issued by the
preceding `__iowrite'.
On Fri, 5 Apr 2019, Mikulas Patocka wrote:
> > > I did some more testing and it turns out that mb() is not entirely
> > > sufficient to prevent the boot hang. mb()'s latecy varies, sometimes it
> > > is
> > > sufficient, sometimes not.
> > >
> > > So, I submit this patch that adds 1us delay
On 4/5/2019 2:28 PM, Maciej W. Rozycki wrote:
You basically can't remove the mb() after __ioread() and before
__iowrite() unless your architecture guarantees IO vs. memory ordering.
I never suggested that; please check my example too.
Sounds good. Sorry for the noise.
I just wanted to make