linux-stable.git/arch/mips/kernel, branch v5.16.2

MIPS: loongson64: fix FTLB configuration

2021-11-25T15:46:31+00:00

It turns out that 'decode_configs' -> 'set_ftlb_enable' is called under
c->cputype unset, which leaves FTLB disabled on BOTH 3A2000 and 3A3000

Fix it by calling "decode_configs" after c->cputype is initialized

Fixes: da1bd29742b1 ("MIPS: Loongson64: Probe CPU features via CPUCFG")
Signed-off-by: Huang Pei 
Signed-off-by: Thomas Bogendoerfer

MIPS: Fix using smp_processor_id() in preemptible in show_cpuinfo()

2021-11-25T15:45:58+00:00

There exists the following issue under DEBUG_PREEMPT:

 BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1
 caller is show_cpuinfo+0x460/0xea0
 ...
 Call Trace:
 [] show_stack+0x94/0x128
 [] dump_stack_lvl+0x94/0xd8
 [] check_preemption_disabled+0x104/0x110
 [] show_cpuinfo+0x460/0xea0
 [] seq_read_iter+0xfc/0x4f8
 [] new_sync_read+0x110/0x1b8
 [] vfs_read+0x1b4/0x1d0
 [] ksys_read+0xd0/0x110
 [] syscall_common+0x34/0x58

We can see the following call trace:
 show_cpuinfo()
   cpu_has_fpu
     current_cpu_data
       smp_processor_id()

 $ addr2line -f -e vmlinux 0xffffffff802209c8
 show_cpuinfo
 arch/mips/kernel/proc.c:188

 $ head -188 arch/mips/kernel/proc.c | tail -1
	 if (cpu_has_fpu)

 arch/mips/include/asm/cpu-features.h
 #  define cpu_has_fpu		(current_cpu_data.options & MIPS_CPU_FPU)

 arch/mips/include/asm/cpu-info.h
 #define current_cpu_data cpu_data[smp_processor_id()]

Based on the above analysis, fix the issue by using raw_cpu_has_fpu
which calls raw_smp_processor_id() in show_cpuinfo().

Fixes: 626bfa037299 ("MIPS: kernel: proc: add CPU option reporting")
Signed-off-by: Tiezhu Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: syscalls: Wire up futex_waitv syscall

2021-11-16T08:25:48+00:00

Wire up the futex_waitv syscall.

Fix Build warning: #warning syscall futex_waitv not implemented [-Wcpp]

Signed-off-by: Wang Haojun 
Signed-off-by: Thomas Bogendoerfer

Merge tag 'mips_5.16_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2021-11-13T17:11:33+00:00

Pull more MIPS updates from Thomas Bogendoerfer:

 - Config updates for BMIPS platform

 - Build fixes

 - Makefile cleanups

* tag 'mips_5.16_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  mips: decompressor: do not copy source files while building
  MIPS: boot/compressed/: add __bswapdi2() to target for ZSTD decompression
  MIPS: fix duplicated slashes for Platform file path
  MIPS: fix *-pkg builds for loongson2ef platform
  PCI: brcmstb: Allow building for BMIPS_GENERIC
  MIPS: BMIPS: Enable PCI Kconfig
  MIPS: VDSO: remove -nostdlib compiler flag
  mips: BCM63XX: ensure that CPU_SUPPORTS_32BIT_KERNEL is set
  MIPS: Update bmips_stb_defconfig
  MIPS: Allow modules to set board_be_handler

Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2021-11-11T00:15:54+00:00

Pull exit cleanups from Eric Biederman:
 "While looking at some issues related to the exit path in the kernel I
  found several instances where the code is not using the existing
  abstractions properly.

  This set of changes introduces force_fatal_sig a way of sending a
  signal and not allowing it to be caught, and corrects the misuse of
  the existing abstractions that I found.

  A lot of the misuse of the existing abstractions are silly things such
  as doing something after calling a no return function, rolling BUG by
  hand, doing more work than necessary to terminate a kernel thread, or
  calling do_exit(SIGKILL) instead of calling force_sig(SIGKILL).

  In the review a deficiency in force_fatal_sig and force_sig_seccomp
  where ptrace or sigaction could prevent the delivery of the signal was
  found. I have added a change that adds SA_IMMUTABLE to change that
  makes it impossible to interrupt the delivery of those signals, and
  allows backporting to fix force_sig_seccomp

  And Arnd found an issue where a function passed to kthread_run had the
  wrong prototype, and after my cleanup was failing to build."

* 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (23 commits)
  soc: ti: fix wkup_m3_rproc_boot_thread return type
  signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed
  signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV)
  exit/r8188eu: Replace the macro thread_exit with a simple return 0
  exit/rtl8712: Replace the macro thread_exit with a simple return 0
  exit/rtl8723bs: Replace the macro thread_exit with a simple return 0
  signal/x86: In emulate_vsyscall force a signal instead of calling do_exit
  signal/sparc32: In setup_rt_frame and setup_fram use force_fatal_sig
  signal/sparc32: Exit with a fatal signal when try_to_clear_window_buffer fails
  exit/syscall_user_dispatch: Send ordinary signals on failure
  signal: Implement force_fatal_sig
  exit/kthread: Have kernel threads return instead of calling do_exit
  signal/s390: Use force_sigsegv in default_trap_handler
  signal/vm86_32: Properly send SIGSEGV when the vm86 state cannot be saved.
  signal/vm86_32: Replace open coded BUG_ON with an actual BUG_ON
  signal/sparc: In setup_tsb_params convert open coded BUG into BUG
  signal/powerpc: On swapcontext failure force SIGSEGV
  signal/sh: Use force_sig(SIGKILL) instead of do_group_exit(SIGKILL)
  signal/mips: Update (_save|_restore)_fp_context to fail with -EFAULT
  signal/sparc32: Remove unreachable do_exit in do_sparc_fault
  ...

MIPS: Allow modules to set board_be_handler

2021-11-09T15:07:26+00:00

After making the brcmstb_gisb driver modular with 707a4cdf86e5 ("bus:
brcmstb_gisb: Allow building as module") Guenter reported that mips
allmodconfig failed to link because board_be_handler was referenced.

Thomas indicated that if we were to continue making the brcmstb_gisb
driver modular for MIPS we would need to introduce a function that
allows setting the board_be_handler and export that function towards
modules.

This is what is being done here: board_be_handler is made static and is
now settable with a mips_set_be_handler() function which is exported.

Reported-by: Guenter Roeck 
Suggested-by: Thomas Bogendoerfer 
Fixes: 707a4cdf86e5 ("bus: brcmstb_gisb: Allow building as module")
Signed-off-by: Florian Fainelli 
Tested-by: Guenter Roeck 
Signed-off-by: Thomas Bogendoerfer

Merge tag 'mips_5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2021-11-05T15:13:19+00:00

Pull MIPS updates from Thomas Bogendoerfer:

 - added printing of CPU options for /proc/cpuinfo

 - removed support for Netlogic SOCs

 - fixes and cleanup

* tag 'mips_5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: Cobalt: Explain GT64111 early PCI fixup
  mips: fix HUGETLB function without THP enabled
  mips: cm: Convert to bitfield API to fix out-of-bounds access
  MIPS: Remove NETLOGIC support
  MIPS: kernel: proc: add CPU option reporting
  MIPS: kernel: proc: use seq_puts instead of seq_printf
  MIPS: kernel: proc: fix trivial style errors
  MIPS: Fix assembly error from MIPSr2 code used within MIPS_ISA_ARCH_LEVEL
  MIPS: octeon: Remove unused functions
  MIPS: Loongson64: Add of_node_put() before break
  bcm47xx: Replace printk(KERN_ALERT ... pci_devname(dev)) with pci_alert()
  bcm47xx: Get rid of redundant 'else'
  MIPS: sni: Fix the build
  MIPS: Avoid macro redefinitions
  MIPS: loongson64: Fix no screen display during boot-up
  MIPS: loongson64: make CPU_LOONGSON64 depends on MIPS_FP_SUPPORT

mips: cm: Convert to bitfield API to fix out-of-bounds access

2021-11-02T09:53:52+00:00

mips_cm_error_report() extracts the cause and other cause from the error
register using shifts.  This works fine for the former, as it is stored
in the top bits, and the shift will thus remove all non-related bits.
However, the latter is stored in the bottom bits, hence thus needs masking
to get rid of non-related bits.  Without such masking, using it as an
index into the cm2_causes[] array will lead to an out-of-bounds access,
probably causing a crash.

Fix this by using FIELD_GET() instead.  Bite the bullet and convert all
MIPS CM handling to the bitfield API, to improve readability and safety.

Fixes: 3885c2b463f6a236 ("MIPS: CM: Add support for reporting CM cache errors")
Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

Merge tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2021-11-02T03:05:19+00:00

Pull tracing updates from Steven Rostedt:

 - kprobes: Restructured stack unwinder to show properly on x86 when a
   stack dump happens from a kretprobe callback.

 - Fix to bootconfig parsing

 - Have tracefs allow owner and group permissions by default (only
   denying others). There's been pressure to allow non root to tracefs
   in a controlled fashion, and using groups is probably the safest.

 - Bootconfig memory managament updates.

 - Bootconfig clean up to have the tools directory be less dependent on
   changes in the kernel tree.

 - Allow perf to be traced by function tracer.

 - Rewrite of function graph tracer to be a callback from the function
   tracer instead of having its own trampoline (this change will happen
   on an arch by arch basis, and currently only x86_64 implements it).

 - Allow multiple direct trampolines (bpf hooks to functions) be batched
   together in one synchronization.

 - Allow histogram triggers to add variables that can perform
   calculations against the event's fields.

 - Use the linker to determine architecture callbacks from the ftrace
   trampoline to allow for proper parameter prototypes and prevent
   warnings from the compiler.

 - Extend histogram triggers to key off of variables.

 - Have trace recursion use bit magic to determine preempt context over
   if branches.

 - Have trace recursion disable preemption as all use cases do anyway.

 - Added testing for verification of tracing utilities.

 - Various small clean ups and fixes.

* tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (101 commits)
  tracing/histogram: Fix semicolon.cocci warnings
  tracing/histogram: Fix documentation inline emphasis warning
  tracing: Increase PERF_MAX_TRACE_SIZE to handle Sentinel1 and docker together
  tracing: Show size of requested perf buffer
  bootconfig: Initialize ret in xbc_parse_tree()
  ftrace: do CPU checking after preemption disabled
  ftrace: disable preemption when recursion locked
  tracing/histogram: Document expression arithmetic and constants
  tracing/histogram: Optimize division by a power of 2
  tracing/histogram: Covert expr to const if both operands are constants
  tracing/histogram: Simplify handling of .sym-offset in expressions
  tracing: Fix operator precedence for hist triggers expression
  tracing: Add division and multiplication support for hist triggers
  tracing: Add support for creating hist trigger variables from literal
  selftests/ftrace: Stop tracing while reading the trace file by default
  MAINTAINERS: Update KPROBES and TRACING entries
  test_kprobes: Move it from kernel/ to lib/
  docs, kprobes: Remove invalid URL and add new reference
  samples/kretprobes: Fix return value if register_kretprobe() failed
  lib/bootconfig: Fix the xbc_get_info kerneldoc
  ...

Merge tag 'fallthrough-fixes-clang-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

2021-11-02T00:32:22+00:00

Pull fallthrough fixes from Gustavo A. R. Silva:
 "Fix some fall-through warnings when building with Clang and
  -Wimplicit-fallthrough"

* tag 'fallthrough-fixes-clang-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
  pcmcia: db1xxx_ss: Fix fall-through warning for Clang
  MIPS: Fix fall-through warnings for Clang
  scsi: st: Fix fall-through warning for Clang