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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-02 19:12:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-02 19:12:45 -0700
commit7d9d077c783e33995c80d8b28fea1a98161934f4 (patch)
tree5404e84d237b764a07aaf299d175c1dcfbad9966 /arch/xtensa
parentc2a24a7a036b3bd3a2e6c66730dfc777cae6540a (diff)
parent34bc7b454dc31f75a0be7ee8ab378135523d7c51 (diff)
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Merge tag 'rcu.2022.07.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull RCU updates from Paul McKenney: - Documentation updates - Miscellaneous fixes - Callback-offload updates, perhaps most notably a new RCU_NOCB_CPU_DEFAULT_ALL Kconfig option that causes all CPUs to be offloaded at boot time, regardless of kernel boot parameters. This is useful to battery-powered systems such as ChromeOS and Android. In addition, a new RCU_NOCB_CPU_CB_BOOST kernel boot parameter prevents offloaded callbacks from interfering with real-time workloads and with energy-efficiency mechanisms - Polled grace-period updates, perhaps most notably making these APIs account for both normal and expedited grace periods - Tasks RCU updates, perhaps most notably reducing the CPU overhead of RCU tasks trace grace periods by more than a factor of two on a system with 15,000 tasks. The reduction is expected to increase with the number of tasks, so it seems reasonable to hypothesize that a system with 150,000 tasks might see a 20-fold reduction in CPU overhead - Torture-test updates - Updates that merge RCU's dyntick-idle tracking into context tracking, thus reducing the overhead of transitioning to kernel mode from either idle or nohz_full userspace execution for kernels that track context independently of RCU. This is expected to be helpful primarily for kernels built with CONFIG_NO_HZ_FULL=y * tag 'rcu.2022.07.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (98 commits) rcu: Add irqs-disabled indicator to expedited RCU CPU stall warnings rcu: Diagnose extended sync_rcu_do_polled_gp() loops rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings rcutorture: Test polled expedited grace-period primitives rcu: Add polled expedited grace-period primitives rcutorture: Verify that polled GP API sees synchronous grace periods rcu: Make Tiny RCU grace periods visible to polled APIs rcu: Make polled grace-period API account for expedited grace periods rcu: Switch polled grace-period APIs to ->gp_seq_polled rcu/nocb: Avoid polling when my_rdp->nocb_head_rdp list is empty rcu/nocb: Add option to opt rcuo kthreads out of RT priority rcu: Add nocb_cb_kthread check to rcu_is_callbacks_kthread() rcu/nocb: Add an option to offload all CPUs on boot rcu/nocb: Fix NOCB kthreads spawn failure with rcu_nocb_rdp_deoffload() direct call rcu/nocb: Invert rcu_state.barrier_mutex VS hotplug lock locking order rcu/nocb: Add/del rdp to iterate from rcuog itself rcu/tree: Add comment to describe GP-done condition in fqs loop rcu: Initialize first_gp_fqs at declaration in rcu_gp_fqs() rcu/kvfree: Remove useless monitor_todo flag rcu: Cleanup RCU urgency state for offline CPU ...
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig2
-rw-r--r--arch/xtensa/kernel/entry.S8
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 0b0f0172cced..7927fed7bc83 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -33,7 +33,7 @@ config XTENSA
select HAVE_ARCH_KCSAN
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
- select HAVE_CONTEXT_TRACKING
+ select HAVE_CONTEXT_TRACKING_USER
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_EXIT_THREAD
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index ab30bcb46290..272fff587907 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -455,10 +455,10 @@ KABI_W or a3, a3, a2
abi_call trace_hardirqs_off
1:
#endif
-#ifdef CONFIG_CONTEXT_TRACKING
+#ifdef CONFIG_CONTEXT_TRACKING_USER
l32i abi_tmp0, a1, PT_PS
bbci.l abi_tmp0, PS_UM_BIT, 1f
- abi_call context_tracking_user_exit
+ abi_call user_exit_callable
1:
#endif
@@ -544,8 +544,8 @@ common_exception_return:
j .Lrestore_state
.Lexit_tif_loop_user:
-#ifdef CONFIG_CONTEXT_TRACKING
- abi_call context_tracking_user_enter
+#ifdef CONFIG_CONTEXT_TRACKING_USER
+ abi_call user_enter_callable
#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT
_bbci.l abi_saved0, TIF_DB_DISABLED, 1f