From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, gs051095@gmail.com
Subject: [PATCH] proc: fix /proc/loadavg regression
Date: Fri, 13 Apr 2018 20:54:08 +0300 [thread overview]
Message-ID: <20180413175408.GA27246@avx2> (raw)
commit 95846ecf9dac5089aed4b144d912225f8ef86ae4
"pid: replace pid bitmap implementation with IDR API"
changed last field of /proc/loadavg (last pid allocated)
to be off by one:
# unshare -p -f --mount-proc cat /proc/loadavg
0.00 0.00 0.00 1/60 2 <===
It should be 1 after first fork into pid namespace.
This is formally a regression but given how useless this field is
I don't think anyone is affected.
Bug was found by /proc testsuite!
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
arch/powerpc/platforms/cell/spufs/sched.c | 2 +-
fs/proc/loadavg.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -1093,7 +1093,7 @@ static int show_spu_loadavg(struct seq_file *s, void *private)
LOAD_INT(c), LOAD_FRAC(c),
count_active_contexts(),
atomic_read(&nr_spu_contexts),
- idr_get_cursor(&task_active_pid_ns(current)->idr));
+ idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
return 0;
}
--- a/fs/proc/loadavg.c
+++ b/fs/proc/loadavg.c
@@ -24,7 +24,7 @@ static int loadavg_proc_show(struct seq_file *m, void *v)
LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
nr_running(), nr_threads,
- idr_get_cursor(&task_active_pid_ns(current)->idr));
+ idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
return 0;
}
reply other threads:[~2018-04-13 17:54 UTC|newest]
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