linux/fs/debugfs/file.c, branch v5.14

Merge tag 'v5.13-rc6' into driver-core-next

2021-06-14T07:07:45Z

We need the driver core fix in here as well. Signed-off-by: Greg Kroah-Hartman

debugfs: Fix debugfs_read_file_str()

2021-06-04T13:01:08Z

Read the entire size of the buffer, including the trailing new line character. Discovered while reading the sched domain names of CPU0: before: cat /sys/kernel/debug/sched/domains/cpu0/domain*/name SMTMCDIE after: cat /sys/kernel/debug/sched/domains/cpu0/domain*/name SMT MC DIE Fixes: 9af0440ec86eb ("debugfs: Implement debugfs_create_str()") Reviewed-by: Steven Rostedt (VMware) Acked-by: Peter Zijlstra (Intel) Signed-off-by: Dietmar Eggemann Link: https://lore.kernel.org/r/20210527091105.258457-1-dietmar.eggemann@arm.com Signed-off-by: Greg Kroah-Hartman

debugfs: remove return value of debugfs_create_ulong()

2021-05-21T18:59:55Z

No one checks the return value of debugfs_create_ulong(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20210521184340.1348539-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

debugfs: remove return value of debugfs_create_bool()

2021-05-21T18:59:03Z

No one checks the return value of debugfs_create_bool(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20210521184519.1356639-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

debugfs: only accept read attributes for blobs

2021-05-14T11:36:18Z

Blobs can only be read. So, keep only 'read' file attributes because the others will not work and only confuse users. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20210504131350.46586-1-wsa+renesas@sang-engineering.com Signed-off-by: Greg Kroah-Hartman

Merge tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-04-28T20:33:57Z

Pull scheduler updates from Ingo Molnar: - Clean up SCHED_DEBUG: move the decades old mess of sysctl, procfs and debugfs interfaces to a unified debugfs interface. - Signals: Allow caching one sigqueue object per task, to improve performance & latencies. - Improve newidle_balance() irq-off latencies on systems with a large number of CPU cgroups. - Improve energy-aware scheduling - Improve the PELT metrics for certain workloads - Reintroduce select_idle_smt() to improve load-balancing locality - but without the previous regressions - Add 'scheduler latency debugging': warn after long periods of pending need_resched. This is an opt-in feature that requires the enabling of the LATENCY_WARN scheduler feature, or the use of the resched_latency_warn_ms=xx boot parameter. - CPU hotplug fixes for HP-rollback, and for the 'fail' interface. Fix remaining balance_push() vs. hotplug holes/races - PSI fixes, plus allow /proc/pressure/ files to be written by CAP_SYS_RESOURCE tasks as well - Fix/improve various load-balancing corner cases vs. capacity margins - Fix sched topology on systems with NUMA diameter of 3 or above - Fix PF_KTHREAD vs to_kthread() race - Minor rseq optimizations - Misc cleanups, optimizations, fixes and smaller updates * tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (61 commits) cpumask/hotplug: Fix cpu_dying() state tracking kthread: Fix PF_KTHREAD vs to_kthread() race sched/debug: Fix cgroup_path[] serialization sched,psi: Handle potential task count underflow bugs more gracefully sched: Warn on long periods of pending need_resched sched/fair: Move update_nohz_stats() to the CONFIG_NO_HZ_COMMON block to simplify the code & fix an unused function warning sched/debug: Rename the sched_debug parameter to sched_verbose sched,fair: Alternative sched_slice() sched: Move /proc/sched_debug to debugfs sched,debug: Convert sysctl sched_domains to debugfs debugfs: Implement debugfs_create_str() sched,preempt: Move preempt_dynamic to debug.c sched: Move SCHED_DEBUG sysctl to debugfs sched: Don't make LATENCYTOP select SCHED_DEBUG sched: Remove sched_schedstats sysctl out from under SCHED_DEBUG sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG sched: Use cpu_dying() to fix balance_push vs hotplug-rollback cpumask: Introduce DYING mask cpumask: Make cpu_{online,possible,present,active}() inline rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs() ...

debugfs: Implement debugfs_create_str()

2021-04-16T15:06:34Z

Implement debugfs_create_str() to easily display names and such in debugfs. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Greg Kroah-Hartman Tested-by: Valentin Schneider Link: https://lkml.kernel.org/r/20210412102001.415407080@infradead.org

debugfs: drop pointless nul-termination in debugfs_read_file_bool()

2021-04-05T11:17:51Z

simple_read_from_buffer() doesn't care about any bytes in the buffer beyond "available". Making the buffer nul-terminated is therefore completely pointless. Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20210326151411.732220-1-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

debugfs: remove return value of debugfs_create_devm_seqfile()

2020-10-30T07:37:39Z

No one checks the return value of debugfs_create_devm_seqfile(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20201023131037.2500765-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

debugfs: Fix module state check condition

2020-09-04T16:12:52Z

The '#ifdef MODULE' check in the original commit does not work as intended. The code under the check is not built at all if CONFIG_DEBUG_FS=y. Fix this by using a correct check. Fixes: 275678e7a9be ("debugfs: Check module state before warning in {full/open}_proxy_open()") Signed-off-by: Vladis Dronov Cc: stable Link: https://lore.kernel.org/r/20200811150129.53343-1-vdronov@redhat.com Signed-off-by: Greg Kroah-Hartman