public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Helge Deller <deller@gmx.de>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org,
	James Bottomley <James.Bottomley@HansenPartnership.com>,
	John David Anglin <dave.anglin@bell.net>
Subject: [GIT PULL] parisc syscall restart fix for v4.4
Date: Fri, 25 Dec 2015 13:19:27 +0100	[thread overview]
Message-ID: <20151225121927.GA6170@ls3530.box> (raw)

Hi Linus,

please pull one late patch for the parisc architecture for kernel v4.4 from:

  git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git parisc-4.4-4

The architectural design of parisc always uses two instructions to call kernel
syscalls (delayed branch feature). This means that the instruction following
the branch (located in the delay slot of the branch instruction) is executed
before control passes to the branch destination.
Depending on which assembler instruction and how it is used in usersapce in
the delay slot, this sometimes made restarted syscalls like futex() and poll()
failing with -ENOSYS.

Thanks,
Helge

----------------------------------------------------------------
Helge Deller (1):
      parisc: Fix syscall restarts

 arch/parisc/kernel/signal.c | 64 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 52 insertions(+), 12 deletions(-)

                 reply	other threads:[~2015-12-25 12:19 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=20151225121927.GA6170@ls3530.box \
    --to=deller@gmx.de \
    --cc=James.Bottomley@HansenPartnership.com \
    --cc=dave.anglin@bell.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-parisc@vger.kernel.org \
    --cc=torvalds@linux-foundation.org \
    /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