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emaclite-cleanupnet: xilinx: emaclite: Remove net_device pointer from struct net_localTobias Klauser8 years
masterMerge tag 'docs-4.10' of git://git.lwn.net/linuxLinus Torvalds8 years
nds-private-removeusbnet: pegasus: Use net_device_stats from struct net_deviceTobias Klauser8 years
packet-loop-backnet: packet: Introduce PACKET_XMIT_RECEIVE socket optionTobias Klauser8 years
packet-rx-pump-backnet: packet: Introduce PACKET_RX_PUMP_BACK socket optionTobias Klauser8 years
 
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-09-19 04:58:57 +0000
h/arch/arm64?id=1e6e57d9b34a9075d5f9e2048ea7b09756590d11'>patch) treeb5708d14f64b03758cb18b795ef18077fdac9b55 /arch/arm64 parent1c5b51dfb7b4564008e0cadec5381a69e88b0d21 (diff)
arm64: percpu: rewrite ll/sc loops in assembly
Writing the outer loop of an LL/SC sequence using do {...} while constructs potentially allows the compiler to hoist memory accesses between the STXR and the branch back to the LDXR. On CPUs that do not guarantee forward progress of LL/SC loops when faced with memory accesses to the same ERG (up to 2k) between the failed STXR and the branch back, we may end up livelocking. This patch avoids this issue in our percpu atomics by rewriting the outer loop as part of the LL/SC inline assembly block. Cc: <stable@vger.kernel.org> Fixes: f97fc810798c ("arm64: percpu: Implement this_cpu operations") Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64')