Puranjay Mohan 20a759df3b riscv, bpf: make some atomic operations fully ordered ... The BPF atomic operations with the BPF_FETCH modifier along with BPF_XCHG and BPF_CMPXCHG are fully ordered but the RISC-V JIT implements all atomic operations except BPF_CMPXCHG with relaxed ordering. Section 8.1 of the "The RISC-V Instruction Set Manual Volume I: Unprivileged ISA" [1], titled, "Specifying Ordering of Atomic Instructions" says: | To provide more efficient support for release consistency [5], each | atomic instruction has two bits, aq and rl, used to specify additional | memory ordering constraints as viewed by other RISC-V harts. and | If only the aq bit is set, the atomic memory operation is treated as | an acquire access. | If only the rl bit is set, the atomic memory operation is treated as a | release access. | | If both the aq and rl bits are set, the atomic memory operation is | sequentially consistent. Fix this by setting both aq and rl bits as 1 for operations with BPF_FETCH and BPF_XCHG. [1] https://riscv.org/wp-content/uploads/2017/05/riscv-spec-v2.2.pdf Fixes: dd642ccb45 ("riscv, bpf: Implement more atomic operations for RV64") Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Reviewed-by: Pu Lehui <pulehui@huawei.com> Link: https://lore.kernel.org/r/20240505201633.123115-1-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2024-05-12 17:00:06 -07:00
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boot	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
configs	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
crypto	crypto: riscv - add vector crypto accelerated AES-CBC-CTS	2024-03-20 08:56:11 -07:00
errata	riscv: errata: Rename defines for Andes	2024-03-12 07:13:12 -07:00
include	riscv: mm: implement pgprot_nx	2024-03-27 07:09:06 -07:00
kernel	riscv: process: Fix kernel gp leakage	2024-04-04 12:35:05 -07:00
kvm	RISC-V: KVM: Fix APLIC in_clrip[x] read emulation	2024-03-26 09:40:55 +05:30
lib	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
mm	riscv: mm: Fix prototype to avoid discarding const	2024-03-26 08:26:43 -07:00
net	riscv, bpf: make some atomic operations fully ordered	2024-05-12 17:00:06 -07:00
purgatory
tools
Kbuild	RISC-V: hook new crypto subdir into build-system	2024-01-22 17:55:17 -08:00
Kconfig	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
Kconfig.debug
Kconfig.errata	RISC-V Patches for the 6.8 Merge Window, Part 4	2024-01-20 11:06:04 -08:00
Kconfig.socs	riscv: dts: Move BUILTIN_DTB_SOURCE to common Kconfig	2024-03-06 00:08:32 +00:00
Makefile	riscv: compat_vdso: install compat_vdso.so.dbg to /lib/modules/*/vdso/	2024-03-26 14:08:02 -07:00
Makefile.postlink