The patch titled
Subject: pid: move pidfd_get_pid() to pid.c
has been added to the -mm tree. Its filename is
pid-move-pidfd_get_pid-to-pidc.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/pid-move-pidfd_get_pid-to-pidc.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/pid-move-pidfd_get_pid-to-pidc.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: pid: move pidfd_get_pid() to pid.c
process_madvise syscall needs pidfd_get_pid function to translate pidfd to
pid so this patch move the function to kernel/pid.c.
Link: http://lkml.kernel.org/r/20200302193630.68771-5-minchan@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20200622192900.22757-3-minchan@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20200901000633.1920247-3-minchan@xxxxxxxxxx
Reviewed-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Suggested-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
Reviewed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: Daniel Colascione <dancol@xxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: John Dias <joaodias@xxxxxxxxxx>
Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Oleksandr Natalenko <oleksandr@xxxxxxxxxx>
Cc: Sandeep Patil <sspatil@xxxxxxxxxx>
Cc: SeongJae Park <sj38.park@xxxxxxxxx>
Cc: SeongJae Park <sjpark@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Sonny Rao <sonnyrao@xxxxxxxxxx>
Cc: Tim Murray <timmurray@xxxxxxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: Florian Weimer <fw@xxxxxxxxxxxxx>
Cc: <linux-man@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pid.h | 1 +
kernel/exit.c | 17 -----------------
kernel/pid.c | 17 +++++++++++++++++
3 files changed, 18 insertions(+), 17 deletions(-)
--- a/include/linux/pid.h~pid-move-pidfd_get_pid-to-pidc
+++ a/include/linux/pid.h
@@ -77,6 +77,7 @@ extern const struct file_operations pidf
struct file;
extern struct pid *pidfd_pid(const struct file *file);
+struct pid *pidfd_get_pid(unsigned int fd);
static inline struct pid *get_pid(struct pid *pid)
{
--- a/kernel/exit.c~pid-move-pidfd_get_pid-to-pidc
+++ a/kernel/exit.c
@@ -1474,23 +1474,6 @@ end:
return retval;
}
-static struct pid *pidfd_get_pid(unsigned int fd)
-{
- struct fd f;
- struct pid *pid;
-
- f = fdget(fd);
- if (!f.file)
- return ERR_PTR(-EBADF);
-
- pid = pidfd_pid(f.file);
- if (!IS_ERR(pid))
- get_pid(pid);
-
- fdput(f);
- return pid;
-}
-
static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop,
int options, struct rusage *ru)
{
--- a/kernel/pid.c~pid-move-pidfd_get_pid-to-pidc
+++ a/kernel/pid.c
@@ -519,6 +519,23 @@ struct pid *find_ge_pid(int nr, struct p
return idr_get_next(&ns->idr, &nr);
}
+struct pid *pidfd_get_pid(unsigned int fd)
+{
+ struct fd f;
+ struct pid *pid;
+
+ f = fdget(fd);
+ if (!f.file)
+ return ERR_PTR(-EBADF);
+
+ pid = pidfd_pid(f.file);
+ if (!IS_ERR(pid))
+ get_pid(pid);
+
+ fdput(f);
+ return pid;
+}
+
/**
* pidfd_create() - Create a new pid file descriptor.
*
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-madvise-pass-mm-to-do_madvise.patch
pid-move-pidfd_get_pid-to-pidc.patch
mm-madvise-introduce-process_madvise-syscall-an-external-memory-hinting-api.patch
