From 11331b1030fba551df4c7fc2babd44496040030f Mon Sep 17 00:00:00 2001
From: Tomer Zeitune <tomerzeitune@gmail.com>
Date: Sun, 27 Nov 2022 00:35:52 +0200
Subject: [PATCH] Enable atomic cas for bpf targets

---
 compiler/rustc_target/src/spec/bpf_base.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_target/src/spec/bpf_base.rs b/compiler/rustc_target/src/spec/bpf_base.rs
index baf36587147a6..2b00cda44b511 100644
--- a/compiler/rustc_target/src/spec/bpf_base.rs
+++ b/compiler/rustc_target/src/spec/bpf_base.rs
@@ -6,7 +6,7 @@ pub fn opts(endian: Endian) -> TargetOptions {
         allow_asm: true,
         endian,
         linker_flavor: LinkerFlavor::Bpf,
-        atomic_cas: false,
+        atomic_cas: true,
         dynamic_linking: true,
         no_builtins: true,
         panic_strategy: PanicStrategy::Abort,
@@ -19,6 +19,10 @@ pub fn opts(endian: Endian) -> TargetOptions {
         obj_is_bitcode: true,
         requires_lto: false,
         singlethread: true,
+        // When targeting the `v3` cpu in llvm, 32-bit atomics are also supported.
+        // But making this value change based on the target cpu can be mostly confusing
+        // and would require a bit of a refactor.
+        min_atomic_width: Some(64),
         max_atomic_width: Some(64),
         ..Default::default()
     }