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| author | Rui Salvaterra <rsalvaterra@gmail.com> | 2021-08-22 14:50:07 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2021-08-29 17:03:38 +0200 |
| commit | 7e135add24911a9302d9e73fe0456318ce8169fa (patch) | |
| tree | e21e070b8d90f6d5c01fa8089b134176252220fb /target/linux/layerscape | |
| parent | b8f8d0651c9ec2a6f4a869fc262d2ba38d723b1f (diff) | |
| download | upstream-7e135add24911a9302d9e73fe0456318ce8169fa.tar.gz upstream-7e135add24911a9302d9e73fe0456318ce8169fa.tar.bz2 upstream-7e135add24911a9302d9e73fe0456318ce8169fa.zip | |
kernel: disable CONFIG_RCU_EXPERT and friends
Based on the existing documentation [1][2], I dare anyone to demonstrate that
we need to fine-tune these RCU parameters. The (performance) breakage potential
for doing so is immense, so let's just please put down this loaded footgun.
Disable CONFIG_RCU_EXPERT and its dependent symbols. Additionally, remove the
CONFIG_RCU_EXPERT symbol from the target kconfigs which contain it.
[1] https://www.kernel.org/doc/Documentation/RCU/Design/Data-Structures/Data-Structures.html
[2] https://lwn.net/Articles/777214/
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Diffstat (limited to 'target/linux/layerscape')
| -rw-r--r-- | target/linux/layerscape/armv7/config-5.4 | 1 | ||||
| -rw-r--r-- | target/linux/layerscape/armv8_64b/config-5.4 | 1 |
2 files changed, 0 insertions, 2 deletions
diff --git a/target/linux/layerscape/armv7/config-5.4 b/target/linux/layerscape/armv7/config-5.4 index 54ac6a4152..126402d76c 100644 --- a/target/linux/layerscape/armv7/config-5.4 +++ b/target/linux/layerscape/armv7/config-5.4 @@ -505,7 +505,6 @@ CONFIG_QORIQ_CPUFREQ=y CONFIG_RAS=y CONFIG_RATIONAL=y CONFIG_RCU_CPU_STALL_TIMEOUT=21 -# CONFIG_RCU_EXPERT is not set CONFIG_RCU_NEED_SEGCBLIST=y CONFIG_RCU_STALL_COMMON=y CONFIG_RD_BZIP2=y diff --git a/target/linux/layerscape/armv8_64b/config-5.4 b/target/linux/layerscape/armv8_64b/config-5.4 index 2ab42c9d70..6846fc96aa 100644 --- a/target/linux/layerscape/armv8_64b/config-5.4 +++ b/target/linux/layerscape/armv8_64b/config-5.4 @@ -671,7 +671,6 @@ CONFIG_RAID6_PQ=y CONFIG_RAS=y CONFIG_RATIONAL=y CONFIG_RCU_CPU_STALL_TIMEOUT=21 -# CONFIG_RCU_EXPERT is not set CONFIG_RCU_NEED_SEGCBLIST=y CONFIG_RCU_STALL_COMMON=y CONFIG_RD_BZIP2=y |