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| author |   Frederic Weisbecker <frederic@kernel.org> | 2020-11-17 16:16:37 +0100 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-11-19 11:25:42 +0100 |
| commit | d1f250e2205eca9f1264f8e2d3a41fcf38f92d91 (patch) | |
| tree | 9909e949a13f72a235cb30071f4aef5eef189879 | |
| parent | context_tracking: Only define schedule_user() on !HAVE_CONTEXT_TRACKING_OFFSTACK archs (diff) | |
| download | wireguard-linux-d1f250e2205eca9f1264f8e2d3a41fcf38f92d91.tar.xz wireguard-linux-d1f250e2205eca9f1264f8e2d3a41fcf38f92d91.zip | |
x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK
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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201117151637.259084-6-frederic@kernel.org
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f6946b81f74a..d793361839b5 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 |