Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Joel Savitz <jsavitz@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Joel Savitz <jsavitz@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Waiman Long <longman@redhat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Kristina Martsenko <kristina.martsenko@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Cyrill Gorcunov <gorcunov@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Micah Morton <mortonm@chromium.org>,
        Yang Shi <yang.shi@linux.alibaba.com>,
        Jann Horn <jannh@google.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Rafael Aquini <aquini@redhat.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Yury Norov <norov.maillist@gmail.com>
Subject: [PATCH v2 2/2] prctl.2: Document the new PR_GET_TASK_SIZE option
Date:   Thu,  2 May 2019 16:52:22 -0400
Message-Id: <1556830342-32307-3-git-send-email-jsavitz@redhat.com>
In-Reply-To: <1556830342-32307-1-git-send-email-jsavitz@redhat.com>
References: <1556830342-32307-1-git-send-email-jsavitz@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add a short explanation of the new PR_GET_TASK_SIZE option for the benefit
of future generations.

Signed-off-by: Joel Savitz <jsavitz@redhat.com>
---
 man2/prctl.2 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man2/prctl.2 b/man2/prctl.2
index 06d8e13c7..35a6a3919 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -49,6 +49,7 @@
 .\" 2013-01-10 Kees Cook, document PR_SET_PTRACER
 .\" 2012-02-04 Michael Kerrisk, document PR_{SET,GET}_CHILD_SUBREAPER
 .\" 2014-11-10 Dave Hansen, document PR_MPX_{EN,DIS}ABLE_MANAGEMENT
+.\" 2019-05-02 Joel Savitz, document PR_GET_TASK_SIZE
 .\"
 .\"
 .TH PRCTL 2 2019-03-06 "Linux" "Linux Programmer's Manual"
@@ -1375,6 +1376,14 @@ system call on Tru64).
 for information on versions and architectures)
 Return unaligned access control bits, in the location pointed to by
 .IR "(unsigned int\ *) arg2" .
+.TP
+.B PR_GET_TASK_SIZE
+Copy the value of TASK_SIZE to the userspace address in
+.IR "(unsigned long\ *) arg2" .
+Return
+.B EFAULT
+if this operation fails.
+
 .SH RETURN VALUE
 On success,
 .BR PR_GET_DUMPABLE ,
-- 
2.18.1