Remove ARM Linux worker configurations (#326)

Author: alexreinking

master/master.cfg

@@ -144,8 +144,6 @@ class HalideWorker(Worker):
 
 
 c["workers"] = [
-    HalideWorker("arm64-linux-worker-3", max_builds=1, arch="arm", bits=[32, 64], os="linux"),
-    HalideWorker("arm64-linux-worker-4", max_builds=1, arch="arm", bits=[32, 64], os="linux"),
     HalideWorker("linux-worker-1", max_builds=4, arch="x86", bits=[32, 64], os="linux"),
     HalideWorker("linux-worker-4", max_builds=4, arch="x86", bits=[32, 64], os="linux"),
     HalideWorker("mac-arm-worker-1", max_builds=2, arch="arm", bits=[64], os="osx"),
@@ -217,15 +215,11 @@ class HalideBuilder(BuilderConfig):
             tags=self.builder_tags(),
         )
 
-    # The ARM workers aren't configured with Python at all.
     # We don't support the Python bindings on 32-bit at all.
     def handles_python(self):
         if self.bits == 32:
             return False
 
-        if self.arch == "arm" and self.os == "linux":
-            return False
-
         if self.sanitizer_preset() is not None:
             return False
 
@@ -478,10 +472,6 @@ def get_cmake_definitions(builder_type, halide_target="host", wasm_jit="wabt", e
     if builder_type.has_ccache() and not builder_type.sanitizer_preset():
         cmake_definitions["Halide_CCACHE_BUILD"] = "ON"
 
-    if builder_type.arch == "arm" and builder_type.bits == 32 and builder_type.os == "linux":
-        # Halide always uses its own toolchain files, from the cmake/ subdir.
-        cmake_definitions["CMAKE_TOOLCHAIN_FILE"] = get_source_path("cmake", "toolchain.linux-arm32.cmake")
-
     if builder_type.os == "windows":
         cmake_definitions["CMAKE_TOOLCHAIN_FILE"] = Interpolate("%(prop:VCPKG_ROOT)s/scripts/buildsystems/vcpkg.cmake")
         # CMake on Windows can't reliably find our pip-installed PyBind11 unless we set pybind11_ROOT to point to it
@@ -558,8 +548,6 @@ _PIP_PLATFORM_TAGS = {
     # (arch, bits, os) -> pip --platform tag; None means native (no flag needed)
     ("x86", 64, "linux"): None,
     ("x86", 32, "linux"): "manylinux_2_28_i686",
-    ("arm", 64, "linux"): None,
-    ("arm", 32, "linux"): "manylinux_2_31_armv7l",
     ("x86", 64, "osx"): None,
     ("arm", 64, "osx"): None,
     ("x86", 64, "windows"): None,
@@ -918,12 +906,6 @@ def get_test_labels(builder_type):
     if preset:
         return targets
 
-    # TODO: some JIT+generator tests are failing on arm32; disable for now
-    # pending fixes (see https://github.com/halide/Halide/issues/4940)
-    if builder_type.arch == "arm" and builder_type.bits == 32 and builder_type.os == "linux":
-        targets["host"].remove("internal")
-        targets["host"].remove("generator")
-
     if builder_type.handles_python():
         targets["host"].extend(["python"])
 
@@ -1130,7 +1112,7 @@ def add_test_steps(factory, builder_type):
                 exclude_tests.append("tutorial_lesson_19")
 
             if builder_type.arch == "arm" or builder_type.bits == 32:
-                # TODO: disable lesson_19 on arm32
+                # TODO: disable lesson_19 on ARM and 32-bit targets
                 # https://github.com/halide/Halide/issues/5224
                 exclude_tests.append("tutorial_lesson_19")
 
@@ -1259,6 +1241,9 @@ def get_interesting_targets():
                 if arch == "arm" and os == "windows":
                     # No buildbots for windows-on-arm (yet)
                     continue
+                if arch == "arm" and os == "linux":
+                    # ARM Linux builds run on GitHub Actions instead.
+                    continue
                 if os == "osx" and bits != 64:
                     # osx is 64-bit only, period
                     continue