linux-kernel - [PATCH 2/4] pid: Export find_task_by

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Message-Id: <20180508140640.0e312dba025df75cbf205cdb@arm.com>
Date:   Tue, 8 May 2018 14:06:40 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Gargi Sharma <gs051095@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Kim Phillips <kim.phillips@....com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Rik van Riel <riel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Russell King <linux@...linux.org.uk>,
        Thierry Reding <treding@...dia.com>,
        Todd Kjos <tkjos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] pid: Export find_task_by_vpid for use in external
 modules

This patch is in the context of allowing the Coresight h/w
trace driver suite to be loaded as modules.  Coresight uses
find_task_by_vpid when running in direct capture mode (via sysfs)
when getting/setting the context ID comparator to trigger on
(/sys/bus/coresight/devices/<x>.etm/ctxid_pid).

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Gargi Sharma <gs051095@...il.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Pavel Tatashin <pasha.tatashin@...cle.com>
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
Cc: Kirill Tkhai <ktkhai@...tuozzo.com>
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: David Howells <dhowells@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Kim Phillips <kim.phillips@....com>
---
Current CoreSight callsite:

https://lxr.missinglinkelectronics.com/linux/include/linux/coresight.h#L285

A quick look didn't find anything, but if Coresight needs to do
something differently, please comment.

 kernel/pid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/pid.c b/kernel/pid.c
index 157fe4b19971..92b1b623f3e0 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -342,6 +342,7 @@ struct task_struct *find_task_by_vpid(pid_t vnr)
 {
 	return find_task_by_pid_ns(vnr, task_active_pid_ns(current));
 }
+EXPORT_SYMBOL_GPL(find_task_by_vpid);
 
 struct task_struct *find_get_task_by_vpid(pid_t nr)
 {
-- 
2.17.0