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 Signed-off-by: Minchan Kim <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> 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: <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-function-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-function-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-function-to-pidc +++ a/kernel/pid.c @@ -518,6 +518,23 @@ 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. * _
