In commit 3a9a3be1 (MDEV-23855)
some previous logic was replaced with the condition
dirty_pct < srv_max_dirty_pages_pct_lwm, which caused
the default value of the parameter innodb_max_dirty_pages_pct_lwm=0
to lose its special meaning: 'refer to innodb_max_dirty_pages_pct instead'.

This implicit special meaning was visible in the function
af_get_pct_for_dirty(), which was removed in
commit f0c295e2 (MDEV-24369).

page_cleaner_flush_pages_recommendation(): Restore the special
meaning that was removed in MDEV-24369.

buf_flush_page_cleaner(): If srv_max_dirty_pages_pct_lwm==0.0,
refer to srv_max_buf_pool_modified_pct. This fixes the observed
performance regression due to excessive page flushing.

buf_pool_t::page_cleaner_wakeup(): Revise the wakeup condition.

innodb_init(): Do initialize srv_max_io_capacity in Mariabackup.
It was previously constantly 0, which caused mariadb-backup --prepare
to hang in buf_flush_sync(), making no progress.

Let us access trx->lock.n_rec_locks directly.

Related: MDEV-24124

Partial upstreaming of Debian packaging commit
https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/93a02bbe848ef9810d44635a3b4d409e71bd0628

Adopt the same install-build-deps.sh the upstream Salsa-CI has started
using. Since we have our own custom build step (to support autobake-deb.sh)
we need to maintain in like this and adopt to upstream changes.

This change will make the stretch-backports build pass and use the
backported libzstd-dev 1.3.8 library (to satisfy the > 1.3.3 requirement).

Also clean away excess autopkgtest stanza and allow missing-breaks to
fail so that in total Salsa-CI would now pass.

- Add libarchive-dev and libkrb5-dev as they are defined as dependencies
  in debian/control
- Update curl dependency to libcurl4-openssl-dev, available in Bionic and Focal
- Remove libstemmer-dev that was added without documented motivations in
  https://github.com/ottok/mariadb/commit/e9ada862651fdb98f84871e4ec59bef1bb36646d
- Remove libdistro-info-perl that was added due to need by autobake-deb.sh
  in https://github.com/ottok/mariadb/commit/eb04ee5c9d2416aa45acd1353dff19f569e96317
  but which is not needed anymore

Keep the user and password definitions as e.g. dbconfig-common expects to
find them there. Extend the file to document (in context) why it is about
to be obsoleted to facilitate users migrating away from it.

Upstreamed from https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/a6583c15226ad9a0ca37861e1bd01057bcff32a5

- Add cracklib-runtime and libarchive-dev as build dependencies
- Update Debian policy standards version to 4.5.0
- Add libssl-dev to libmariadb-dev run-time dependency
- Add "Multi-Arch: same" to packages that have it in Debian
- Sync README.Debian
- Sync debian/rules formatting
- Sync autopkgtests

Upstreamed from https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/13e3a7903e5c72e70c02b98a3e51a6de70b9b6ef

Also clean away impossible/unnecessary "Multi-Arch: same" stanzas.
Mostly upstreamed from https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/f0ba31e1565feaca9c2a6f2534e55bfc29af7021

Omitted 'libzstd-dev (>= 1.3.3)' as the version requirement would need
stretch-backports to be available on buildbot.askmonty.org builders and
they are not yet.

The mariadb.service systemd file indeed does contain:
  ExecStartPost=/etc/mysql/debian-start

So don't claim it does not use debian-start.

Upstreamed from https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/af869e703014b25795b0891e3450520c599d3650

- no space after comment
- align equal signs in groups

Upstreamed from: https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/a8c67e15c9a58199f085ae84cdb97c542667767d

Let us use Intel intrinsic functions in WolfSSL whenever possible.
This allows such code to be compiled WITH_MSAN.

ha_innobase::check_if_supported_inplace_alter(): Invoke is_read_only()
only after calling update_thd(). In this way, the assertion failure
should be avoided even if the client was reconnected right before an
ALTER TABLE statement.

This bug was introduced by MDEV-23497.

Move 'encryption' tests to another job, since the 'binlog' and 'rpl'
tests are so slow and often make the job timeout (after 50 minutes).

Allow failure in ppc64el as it frequently fails due to out-of-memory.
A simple restart often fixes it, but we can't depend on restarts.

Also re-enable arm64 as MDEV-23955 is now fixed.

MERGING: This commit is OK to merge 10.6 and upwards.

WaitOnAddress() turns out to be too CPU-heavy for the specific scenario,
which makes it prominent in profiler output on several benchmarks with
contended sux_lock.

The condition variable implementation does not show the same behavior.
Thus, defined SRWLOCK_DUMMY for Windows

srw_mutex should remain mapped to SRWLOCK on Windows (since SRWLOCK is
smaller).

dbug_print_rec() functions used to print data inside GDB.

If PLUGIN_COLUMNSTORE is not defined, ColumnStore will build automatically
by default on supported architectures as defined in its CMakeFile.txt.

Thus there should not be any need to inject this build flag at any point
and it can be removed to keep thing lean and clean.

ColumnStore seems to build by default, so it must be explicitly disabled
with a build flag, so that it does not build at all and thus build machine
disk space and CPU will be spared.

This reverts commit 113f1868.

Remove the unused dbug_print_rec() functions because they break
the clang build due to -Wreturn-stack-address

The function is not used anywhere and it seems buggy anyway
given Rinat's observations from MDEV-24031
r=robertbindar

Fix a trivial error in the fix for MDEV-21958: check the key in the right
table.

Add missed PSI_CALL_drop_table_share().

Galera replication does not support XA transactions yet. Reject any
attempt to `XA START` a transaction, if Galera is enabled.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

recv_sys_t::apply(): At the end of the last batch, wait for
pending reads to complete (read_slots->wait()), instead of
waiting for some time, and assert that buf_pool.n_pend_reads==0
after that wait.

io_callback(): Do not invoke read_slots->release()
before the callback function has returned, to ensure
the correct operation of recv_sys_t::apply().