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kernel: disable CONFIG_RCU_EXPERT and friends

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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>
This commit is contained in:
Rui Salvaterra
2021-08-22 14:50:07 +01:00
committed by Hauke Mehrtens
parent b8f8d0651c
commit 7e135add24
14 changed files with 2 additions and 23 deletions
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target/linux/oxnas/ox820/config-default
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@@ -79,7 +79,6 @@ CONFIG_PCI_MSI_IRQ_DOMAIN=y
# CONFIG_PL310_ERRATA_769419 is not set
CONFIG_PM_SLEEP_SMP=y
CONFIG_RCU_CPU_STALL_TIMEOUT=21
# CONFIG_RCU_EXPERT is not set
CONFIG_RCU_NEED_SEGCBLIST=y
CONFIG_RCU_STALL_COMMON=y
CONFIG_RFS_ACCEL=y