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  1. Jun 20, 2023
  3. Jun 13, 2023
  5. May 29, 2023
    • Linus Torvalds's avatar
      Merge tag 'trace-v6.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace · 8b817fde
      Linus Torvalds authored 
      Pull tracing fixes from Steven Rostedt:
 "User events:

   - Use long instead of int for storing the enable set/clear bit, as it
     was found that big endian machines could end up using the wrong
     bits.

   - Split allocating mm and attaching it. This keeps the allocation
     separate from the registration and avoids various races.

   - Remove RCU locking around pin_user_pages_remote() as that can
     schedule. The RCU protection is no longer needed with the above
     split of mm allocation and attaching.

   - Rename the "link" fields of the various structs to something more
     meaningful.

   - Add comments around user_event_mm struct usage and locking
     requirements.

  Timerlat tracer:

   - Fix missed wakeup of timerlat thread caused by the timerlat
     interrupt triggering when tracing is off. The timer interrupt
     handler needs to always wake up the timerlat thread regardless if
     tracing is enabled or not, otherwise, it will never wake up.

  Histograms:

   - Fix regression of breaking the "stacktrace" modifier for variables.
     That modifier cannot be used for values, but can be used for
     variables that are passed from one histogram to the next. This was
     broken when adding the restriction to values as the variable logic
     used the same code.

   - Rename the special field "stacktrace" to "common_stacktrace".

     Special fields (that are not actually part of the event, but can
     act just like event fields, like 'comm' and 'timestamp') should be
     prefixed with 'common_' for consistency. To keep backward
     compatibility, 'stacktrace' can still be used (as with the special
     field 'cpu'), but can be overridden if the event has a field called
     'stacktrace'.

   - Update the synthetic event selftests to use the new name (synthetic
     events are created by histograms)

  Tracing bootup selftests:

   - Reorganize the code to keep artifacts of the selftests not compiled
     in when selftests are not configured.

   - Add various cond_resched() around the selftest code, as the
     softlock watchdog was triggering much more often. It appears that
     the kernel runs slower now with full debugging enabled.

   - While debugging ftrace with ftrace (using an instance ring buffer
     instead of the top level one), I found that the selftests were
     disabling prints to the debug instance.

     This should not happen, as the selftests only disable printing to
     the main buffer as the selftests examine the main buffer to see if
     it has what it expects, and prints can make the tests fail.

     Make the selftests only disable printing to the toplevel buffer,
     and leave the instance buffers alone"

* tag 'trace-v6.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing: Have function_graph selftest call cond_resched()
  tracing: Only make selftest conditionals affect the global_trace
  tracing: Make tracing_selftest_running/delete nops when not used
  tracing: Have tracer selftests call cond_resched() before running
  tracing: Move setting of tracing_selftest_running out of register_tracer()
  tracing/selftests: Update synthetic event selftest to use common_stacktrace
  tracing: Rename stacktrace field to common_stacktrace
  tracing/histograms: Allow variables to have some modifiers
  tracing/user_events: Document user_event_mm one-shot list usage
  tracing/user_events: Rename link fields for clarity
  tracing/user_events: Remove RCU lock while pinning pages
  tracing/user_events: Split up mm alloc and attach
  tracing/timerlat: Always wakeup the timerlat thread
  tracing/user_events: Use long vs int for atomic bit ops
      8b817fde
    • Linus Torvalds's avatar
      Merge tag 'v6.4-p3' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 7a6c8e51
      Linus Torvalds authored 
      Pull crypto fix from Herbert Xu:
 "Fix an alignment crash in x86/aria"

* tag 'v6.4-p3' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: x86/aria - Use 16 byte alignment for GFNI constant vectors
      7a6c8e51
    • Linus Torvalds's avatar
      Revert "module: error out early on concurrent load of the same module file" · ac2263b5
      Linus Torvalds authored 
      

This reverts commit 9828ed3f.

Sadly, it does seem to cause failures to load modules. Johan Hovold reports:

 "This change breaks module loading during boot on the Lenovo Thinkpad
  X13s (aarch64).

  Specifically it results in indefinite probe deferral of the display
  and USB (ethernet) which makes it a pain to debug. Typing in the dark
  to acquire some logs reveals that other modules are missing as well"

Since this was applied late as a "let's try this", I'm reverting it
asap, and we can try to figure out what goes wrong later.  The excessive
parallel module loading problem is annoying, but not noticeable in
normal situations, and this was only meant as an optimistic workaround
for a user-space bug.

One possible solution may be to do the optimistic exclusive open first,
and then use a lock to serialize loading if that fails.

Reported-by: default avatarJohan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/lkml/ZHRpH-JXAxA6DnzR@hovoldconsulting.com/


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ac2263b5
    • Steven Rostedt (Google)'s avatar
      tracing: Have function_graph selftest call cond_resched() · a2d910f0
      Steven Rostedt (Google) authored 
      When all kernel debugging is enabled (lockdep, KSAN, etc), the function
graph enabling and disabling can take several seconds to complete. The
function_graph selftest enables and disables function graph tracing
several times. With full debugging enabled, the soft lockup watchdog was
triggering because the selftest was running without ever scheduling.

Add cond_resched() throughout the test to make sure it does not trigger
the soft lockup detector.

Link: https://lkml.kernel.org/r/20230528051742.1325503-6-rostedt@goodmis.org



Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
      a2d910f0
    • Steven Rostedt (Google)'s avatar
      tracing: Only make selftest conditionals affect the global_trace · ac9d2cb1
      Steven Rostedt (Google) authored 
      The tracing_selftest_running and tracing_selftest_disabled variables were
to keep trace_printk() and other writes from affecting the tracing
selftests, as the tracing selftests would examine the ring buffer to see
if it contained what it expected or not. trace_printk() and friends could
add to the ring buffer and cause the selftests to fail (and then disable
the tracer that was being tested). To keep that from happening, these
variables were added and would keep trace_printk() and friends from
writing to the ring buffer while the tests were going on.

But this was only the top level ring buffer (owned by the global_trace
instance). There is no reason to prevent writing into ring buffers of
other instances via the trace_array_printk() and friends. For the
functions that could be used by other instances, check if the global_trace
is the tracer instance that is being written to before deciding to not
allow the write.

Link: https://lkml.kernel.org/r/20230528051742.1325503-5-rostedt@goodmis.org



Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
      ac9d2cb1
    • Steven Rostedt (Google)'s avatar
      tracing: Make tracing_selftest_running/delete nops when not used · a3ae76d7
      Steven Rostedt (Google) authored 
      There's no reason to test the condition variables tracing_selftest_running
or tracing_selftest_delete when tracing selftests are not enabled. Make
them define 0s when not the selftests are not configured in.

Link: https://lkml.kernel.org/r/20230528051742.1325503-4-rostedt@goodmis.org



Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
      a3ae76d7
    • Steven Rostedt (Google)'s avatar
      tracing: Have tracer selftests call cond_resched() before running · 9da705d4
      Steven Rostedt (Google) authored 
      As there are more and more internal selftests being added to the Linux
kernel (KSAN, lockdep, etc) the selftests are taking longer to run when
these are enabled. Add a cond_resched() to the calling of
do_run_tracer_selftest() to force a schedule if NEED_RESCHED is set,
otherwise the soft lockup watchdog may trigger on boot up.

Link: https://lkml.kernel.org/r/20230528051742.1325503-3-rostedt@goodmis.org



Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
      9da705d4
    • Steven Rostedt (Google)'s avatar
      tracing: Move setting of tracing_selftest_running out of register_tracer() · e8352cf5
      Steven Rostedt (Google) authored 
      The variables tracing_selftest_running and tracing_selftest_disabled are
only used for when CONFIG_FTRACE_STARTUP_TEST is enabled. Make them only
visible within the selftest code. The setting of those variables are in
the register_tracer() call, and set in a location where they do not need
to be. Create a wrapper around run_tracer_selftest() called
do_run_tracer_selftest() which sets those variables, and have
register_tracer() call that instead.

Having those variables only set within the CONFIG_FTRACE_STARTUP_TEST
scope gets rid of them (and also the ability to remove testing against
them) when the startup tests are not enabled (most cases).

Link: https://lkml.kernel.org/r/20230528051742.1325503-2-rostedt@goodmis.org



Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
      e8352cf5
    • Linus Torvalds's avatar
      Merge tag 'phy-fixes-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy · e338142b
      Linus Torvalds authored 
      Pull phy fixes from Vinod Koul:

 - init count imbalance fix in qcom-qmp-pcie and combo drivers

 - kernel doc header fix for qcom-snps driver

 - mediatek floating point comparison fix

 - amlogic fix register value

* tag 'phy-fixes-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy:
  phy: qcom-snps: correct struct qcom_snps_hsphy kerneldoc
  phy: amlogic: phy-meson-g12a-mipi-dphy-analog: fix CNTL2_DIF_TX_CTL0 value
  phy: mediatek: rework the floating point comparisons to fixed point
  phy: qcom-qmp-pcie-msm8996: fix init-count imbalance
  phy: qcom-qmp-combo: fix init-count imbalance
      e338142b
    • Linus Torvalds's avatar
      Merge tag 'dmaengine-fix-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine · dca389eb
      Linus Torvalds authored 
      Pull dmaengine fixes from Vinod Koul:
 "Driver fixes for the at-hdmac, pl330, TI and IDXD drivers:

   - AT HDMAC driver fixes for Flow Controller bitfield, peripheral ID
     handling and potential NULL dereference check

   - PL330 function rename to avoid conflicts

   - build warning fix for pm function in TI driver

   - IDXD driver fix for passing freed memory"

* tag 'dmaengine-fix-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: at_hdmac: Extend the Flow Controller bitfield to three bits
  dmaengine: at_hdmac: Repair bitfield macros for peripheral ID handling
  dmaengine: pl330: rename _start to prevent build error
  dmaengine: at_xdmac: fix potential Oops in at_xdmac_prep_interleaved()
  dmaengine: ti: k3-udma: annotate pm function with __maybe_unused
  dmaengine: idxd: Fix passing freed memory in idxd_cdev_open()
      dca389eb
  7. May 28, 2023