linux-kernel - Re: [PATCH 2/2] ipc: fix sparc64 ipc() wrapper

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Date:   Thu, 5 Sep 2019 10:22:36 -0700
From:   Matt Turner <mattst88@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Christian Brauner <christian@...uner.io>,
        Manfred Spraul <manfred@...orfullife.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        stable@...r.kernel.org, sparclinux@...r.kernel.org,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/2] ipc: fix sparc64 ipc() wrapper

On Thu, Sep 5, 2019 at 8:23 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> Matt bisected a sparc64 specific issue with semctl, shmctl and msgctl
> to a commit from my y2038 series in linux-5.1, as I missed the custom
> sys_ipc() wrapper that sparc64 uses in place of the generic version that
> I patched.
>
> The problem is that the sys_{sem,shm,msg}ctl() functions in the kernel
> now do not allow being called with the IPC_64 flag any more, resulting
> in a -EINVAL error when they don't recognize the command.
>
> Instead, the correct way to do this now is to call the internal
> ksys_old_{sem,shm,msg}ctl() functions to select the API version.
>
> As we generally move towards these functions anyway, change all of
> sparc_ipc() to consistently use those in place of the sys_*() versions,
> and move the required ksys_*() declarations into linux/syscalls.h
>
> Reported-by: Matt Turner <mattst88@...il.com>
> Fixes: 275f22148e87 ("ipc: rename old-style shmctl/semctl/msgctl syscalls")
> Cc: stable@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> Hi Matt,
>
> Can you check that this solves your problem?

Works great. Thank you Arnd!

Tested-by: Matt Turner <mattst88@...il.com>