From: Andrea Vai <andrea.vai@unipv.it>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg KH <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org
Subject: Re: Slow I/O on USB media
Date: Wed, 05 Jun 2019 17:46:51 +0200 [thread overview]
Message-ID: <4f2e5b456eb0f53b8c921465c1b1c4813b918f65.camel@unipv.it> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1906051022380.1788-100000@iolanthe.rowland.org>
Hi,
Il giorno mer, 05/06/2019 alle 10.26 -0400, Alan Stern ha scritto:
> On Wed, 5 Jun 2019, Andrea Vai wrote:
>
> > Hi,
> > Il giorno mar, 04/06/2019 alle 07.43 +0200, Greg KH ha scritto:
> > > On Mon, Jun 03, 2019 at 01:13:48PM +0200, Andrea Vai wrote:
> > > > Il giorno gio, 30/05/2019 alle 06.25 -0700, Greg KH ha
> scritto:
> > > > > [...]
> > > > Hi,
> > > >
> > > > > Any chance you can use 'git bisect' to find the offending
> > > commit?
> > > > Yes, I am doing it as I managed to build the kernel from
> source
> > >
> > > Great! What did you find?
> >
> > # first bad commit: [534903d60376b4989b76ec445630aa10f2bc3043]
> > drm/atomic: Use explicit old crtc state in
> > drm_atomic_add_affected_planes()
> >
> > By the way, as I am not expert, is there a way to double-check
> that I
> > bisected correctly? (such as, e.g., test with the version before
> this
> > one, and then with this commit applied?)
>
> That is exactly the way to do it: Build a kernel from that commit
> and
> see that it fails, then revert the commit and see that the
> resulting
> kernel succeeds.
>
> (Note: The notion of "version before" doesn't have a firm meaning
> in
> the kernel, because some commits have multiple parents. The best
> way
> to see if a single commit caused a change is to do what I said
> above:
> revert the commit and see what happens.)
ok, thank you for pointing it out. So, my question is: how to revert a
commit? (sorry, I prefer to ask you because I am afraid I could do
something wrong, and don't trust too much myself and what I pick up
searching on the web. In the special case, I found "git revert", but
for example how could I revert back a "reversion"? :-/ (I know I miss
the basis, I never worked with git, so sorry for the stupid
question)).
>
> Incidentally, it seems very unlikely that a commit for the drm
> subsystem would have any effect on the behavior of a USB storage
> device.
well, I had the same doubt and that's the reason I was trying to do
the check: I'm afraid I have done something wrong or made a mess with
the bisect process.
Thank you,
Andrea
next prev parent reply other threads:[~2019-06-05 15:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-30 13:18 Slow I/O on USB media Andrea Vai
2019-05-30 13:25 ` Greg KH
2019-06-03 11:13 ` Andrea Vai
2019-06-04 5:43 ` Greg KH
2019-06-04 7:26 ` Andrea Vai
2019-06-05 7:36 ` Andrea Vai
2019-06-05 14:26 ` Alan Stern
2019-06-05 15:46 ` Andrea Vai [this message]
2019-06-05 16:11 ` Alan Stern
2019-06-05 14:55 ` Greg KH
[not found] ` <0c2adde7154b0a6c8b2ad7fc5258916731b78775.camel@unipv.it>
2019-06-05 16:23 ` Andrea Vai
2019-06-05 17:39 ` Greg KH
2019-06-06 8:41 ` Andrea Vai
2019-06-06 9:03 ` Andrea Vai
2019-06-06 14:00 ` Andrea Vai
2019-06-06 14:30 ` Alan Stern
2019-06-06 14:47 ` Greg KH
2019-06-07 7:59 ` Andrea Vai
2019-06-08 7:43 ` Andrea Vai
2019-06-08 9:29 ` Andrea Vai
2019-06-10 14:38 ` Greg KH
2019-06-11 6:48 ` Andrea Vai
2019-06-10 14:40 ` Alan Stern
2019-06-10 14:55 ` Andrea Vai
2019-06-10 16:20 ` Alan Stern
2019-06-17 15:52 ` Andrea Vai
2019-06-17 16:14 ` Alan Stern
2019-06-17 16:34 ` Andrea Vai
2019-06-17 17:28 ` Alan Stern
2019-07-01 17:52 ` Andrea Vai
2019-07-01 18:57 ` Alan Stern
2019-06-10 14:37 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4f2e5b456eb0f53b8c921465c1b1c4813b918f65.camel@unipv.it \
--to=andrea.vai@unipv.it \
--cc=gregkh@linuxfoundation.org \
--cc=linux-usb@vger.kernel.org \
--cc=stern@rowland.harvard.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).