linux-toradex.git/kernel, branch v5.17-rc1

Merge tag 'trace-v5.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2022-01-23T06:07:02+00:00

Pull ftrace fix from Steven Rostedt:
 "Fix s390 breakage from sorting mcount tables.

  The latest merge of the tracing tree sorts the mcount table at build
  time. But s390 appears to do things differently (like always) and
  replaces the sorted table back to the original unsorted one. As the
  ftrace algorithm depends on it being sorted, bad things happen when it
  is not, and s390 experienced those bad things.

  Add a new config to tell the boot if the mcount table is sorted or
  not, and allow s390 to opt out of it"

* tag 'trace-v5.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Fix assuming build time sort works for s390

ftrace: Fix assuming build time sort works for s390

2022-01-23T05:10:09+00:00

To speed up the boot process, as mcount_loc needs to be sorted for ftrace
to work properly, sorting it at build time is more efficient than boot up
and can save milliseconds of time. Unfortunately, this change broke s390
as it will modify the mcount_loc location after the sorting takes place
and will put back the unsorted locations. Since the sorting is skipped at
boot up if it is believed that it was sorted at run time, ftrace can crash
as its algorithms are dependent on the list being sorted.

Add a new config BUILDTIME_MCOUNT_SORT that is set when
BUILDTIME_TABLE_SORT but not if S390 is set. Use this config to determine
if sorting should take place at boot up.

Link: https://lore.kernel.org/all/yt9dee51ctfn.fsf@linux.ibm.com/

Fixes: 72b3942a173c ("scripts: ftrace - move the sort-processing in ftrace_init")
Reported-by: Sven Schnelle 
Tested-by: Heiko Carstens 
Signed-off-by: Steven Rostedt (Google)

Merge tag 'bitmap-5.17-rc1' of git://github.com/norov/linux

2022-01-23T04:20:44+00:00

Pull bitmap updates from Yury Norov:

 - introduce for_each_set_bitrange()

 - use find_first_*_bit() instead of find_next_*_bit() where possible

 - unify for_each_bit() macros

* tag 'bitmap-5.17-rc1' of git://github.com/norov/linux:
  vsprintf: rework bitmap_list_string
  lib: bitmap: add performance test for bitmap_print_to_pagebuf
  bitmap: unify find_bit operations
  mm/percpu: micro-optimize pcpu_is_populated()
  Replace for_each_*_bit_from() with for_each_*_bit() where appropriate
  find: micro-optimize for_each_{set,clear}_bit()
  include/linux: move for_each_bit() macros from bitops.h to find.h
  cpumask: replace cpumask_next_* with cpumask_first_* where appropriate
  tools: sync tools/bitmap with mother linux
  all: replace find_next{,_zero}_bit with find_first{,_zero}_bit where appropriate
  cpumask: use find_first_and_bit()
  lib: add find_first_and_bit()
  arch: remove GENERIC_FIND_FIRST_BIT entirely
  include: move find.h from asm_generic to linux
  bitops: move find_bit_*_le functions from le.h to find.h
  bitops: protect find_first_{,zero}_bit properly

proc: remove PDE_DATA() completely

2022-01-22T06:33:37+00:00

Remove PDE_DATA() completely and replace it with pde_data().

[akpm@linux-foundation.org: fix naming clash in drivers/nubus/proc.c]
[akpm@linux-foundation.org: now fix it properly]

Link: https://lkml.kernel.org/r/20211124081956.87711-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song 
Acked-by: Christian Brauner 
Cc: Alexey Dobriyan 
Cc: Alexey Gladkov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

locking/rwlocks: introduce write_lock_nested

2022-01-22T06:33:37+00:00

In preparation for converting bit_spin_lock to rwlock in zsmalloc so
that multiple writers of zspages can run at the same time but those
zspages are supposed to be different zspage instance.  Thus, it's not
deadlock.  This patch adds write_lock_nested to support the case for
LOCKDEP.

[minchan@kernel.org: fix write_lock_nested for RT]
  Link: https://lkml.kernel.org/r/YZfrMTAXV56HFWJY@google.com
[bigeasy@linutronix.de: fixup write_lock_nested() implementation]
  Link: https://lkml.kernel.org/r/20211123170134.y6xb7pmpgdn4m3bn@linutronix.de

Link: https://lkml.kernel.org/r/20211115185909.3949505-8-minchan@kernel.org
Signed-off-by: Minchan Kim 
Signed-off-by: Sebastian Andrzej Siewior 
Acked-by: Peter Zijlstra (Intel) 
Acked-by: Sebastian Andrzej Siewior 
Tested-by: Sebastian Andrzej Siewior 
Cc: Mike Galbraith 
Cc: Sergey Senozhatsky 
Cc: Thomas Gleixner 
Cc: Naresh Kamboju 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax

2022-01-22T06:33:37+00:00

When we pass a negative value to the proc_doulongvec_minmax() function,
the function returns 0, but the corresponding interface value does not
change.

we can easily reproduce this problem with the following commands:

    cd /proc/sys/fs/epoll
    echo -1 > max_user_watches; echo $?; cat max_user_watches

This function requires a non-negative number to be passed in, so when a
negative number is passed in, -EINVAL is returned.

Link: https://lkml.kernel.org/r/20211220092627.3744624-1-libaokun1@huawei.com
Signed-off-by: Baokun Li 
Reported-by: Hulk Robot 
Acked-by: Luis Chamberlain 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kernel/sysctl.c: remove unused variable ten_thousand

2022-01-22T06:33:37+00:00

The const variable ten_thousand is not used, it is redundant and can be
removed.

Cleans up clang warning:

  kernel/sysctl.c:99:18: warning: unused variable 'ten_thousand' [-Wunused-const-variable]
  static const int ten_thousand = 10000;

Link: https://lkml.kernel.org/r/20211221184501.574670-1-colin.i.king@gmail.com
Fixes: c26da54dc8ca ("printk: move printk sysctl to printk/sysctl.c")
Signed-off-by: Colin Ian King 
Acked-by: Luis Chamberlain 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobe: move sysctl_kprobes_optimization to kprobes.c

2022-01-22T06:33:36+00:00

kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.

To help with this maintenance let's start by moving sysctls to places
where they actually belong.  The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we
just care about the core logic.

Move sysctl_kprobes_optimization from kernel/sysctl.c to
kernel/kprobes.c.  Use register_sysctl() to register the sysctl
interface.

[mcgrof@kernel.org: fix compile issue when CONFIG_OPTPROBES is disabled]

Link: https://lkml.kernel.org/r/20211129211943.640266-7-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni 
Signed-off-by: Luis Chamberlain 
Cc: Al Viro 
Cc: Anil S Keshavamurthy 
Cc: Antti Palosaari 
Cc: Christian Brauner 
Cc: "David S. Miller" 
Cc: Eric Biederman 
Cc: Eric Biggers 
Cc: Iurii Zaikin 
Cc: Kees Cook 
Cc: Lukas Middendorf 
Cc: Masami Hiramatsu 
Cc: "Naveen N. Rao" 
Cc: Stephen Kitt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/coredump: move coredump sysctls into its own file

2022-01-22T06:33:36+00:00

This moves the fs/coredump.c respective sysctls to its own file.

Link: https://lkml.kernel.org/r/20211129211943.640266-6-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni 
Signed-off-by: Luis Chamberlain 
Cc: Al Viro 
Cc: Anil S Keshavamurthy 
Cc: Antti Palosaari 
Cc: Christian Brauner 
Cc: "David S. Miller" 
Cc: Eric Biederman 
Cc: Eric Biggers 
Cc: Iurii Zaikin 
Cc: Kees Cook 
Cc: Lukas Middendorf 
Cc: Masami Hiramatsu 
Cc: "Naveen N. Rao" 
Cc: Stephen Kitt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

printk: fix build warning when CONFIG_PRINTK=n

2022-01-22T06:33:36+00:00

build warning when CONFIG_PRINTK=n

	kernel/printk/printk.c:175:5: warning: no previous prototype for
	 'devkmsg_sysctl_set_loglvl' [-Wmissing-prototypes]

devkmsg_sysctl_set_loglvl() is only used in sysctl.c when
CONFIG_PRINTK=y, but it participates in the build when CONFIG_PRINTK=n.
So add compile dependency CONFIG_PRINTK=y && CONFIG_SYSCTL=y to fix the
build warning.

Link: https://lkml.kernel.org/r/20211129211943.640266-5-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni 
Signed-off-by: Luis Chamberlain 
Cc: Al Viro 
Cc: Anil S Keshavamurthy 
Cc: Antti Palosaari 
Cc: Christian Brauner 
Cc: "David S. Miller" 
Cc: Eric Biederman 
Cc: Eric Biggers 
Cc: Iurii Zaikin 
Cc: Kees Cook 
Cc: Lukas Middendorf 
Cc: Masami Hiramatsu 
Cc: "Naveen N. Rao" 
Cc: Stephen Kitt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds