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| author | Paul E. McKenney <paulmck@kernel.org> | 2025-01-10 22:26:23 +0300 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2025-02-05 18:14:40 +0300 |
| commit | 536e8b9b80bc7a0a8e87af2d5fb7fe3e230669ca (patch) | |
| tree | eda5b58de8dc6fe220eb018732733edca030d5f7 | |
| parent | 38b43eca6665434225284c0b583a39340f4e1f37 (diff) | |
| download | linux-536e8b9b80bc7a0a8e87af2d5fb7fe3e230669ca.tar.xz | |
srcu: Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing
The srcu_read_lock_nmisafe() and srcu_read_unlock_nmisafe() functions
map to __srcu_read_lock() and __srcu_read_unlock() on systems like x86
that have NMI-safe this_cpu_inc() operations. This makes the underlying
__srcu_read_lock_nmisafe() and __srcu_read_unlock_nmisafe() functions
difficult to test on (for example) x86 systems, allowing bugs to creep in.
This commit therefore creates a FORCE_NEED_SRCU_NMI_SAFE Kconfig that
forces those underlying functions to be used even on systems where they
are not needed, thus providing better testing coverage.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
| -rw-r--r-- | kernel/rcu/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index b9b6bc55185d..c8e540af3a35 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -65,6 +65,17 @@ config TREE_SRCU help This option selects the full-fledged version of SRCU. +config FORCE_NEED_SRCU_NMI_SAFE + bool "Force selection of NEED_SRCU_NMI_SAFE" + depends on !TINY_SRCU + select NEED_SRCU_NMI_SAFE + default n + help + This option forces selection of the NEED_SRCU_NMI_SAFE + Kconfig option, allowing testing of srcu_read_lock_nmisafe() + and srcu_read_unlock_nmisafe() on architectures (like x86) + that select the ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option. + config NEED_SRCU_NMI_SAFE def_bool HAVE_NMI && !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && !TINY_SRCU |