Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 5/5] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK | Date | Mon, 5 Oct 2020 12:49:19 +0200 |
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A lot of ground work has been performed on x86 entry code. Fragile path between user_enter() and user_exit() have IRQs disabled. Uses of RCU and intrumentation in these fragile areas have been explicitly annotated and protected.
This architecture doesn't need exception_enter()/exception_exit() anymore and has therefore earned CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Phil Auld <pauld@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7101ac64bb20..7a66865f32a8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -162,6 +162,7 @@ config X86 select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING if X86_64 + select HAVE_CONTEXT_TRACKING_OFFSTACK if HAVE_CONTEXT_TRACKING select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS -- 2.25.1
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