Revert "[Build] DeepGEMM migration to torch Stable ABI (#59482)" (#61510)

Signed-off-by: Nick Hill <nickhill123@gmail.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.buildkite/check-torch-abi.py

@@ -17,6 +17,7 @@ ALLOWED_UNSTABLE_LIBRARIES: tuple[str, ...] = (
     # _C_stable_libtorch, but these two modules still bind libtorch directly.
     "_C.abi3.so",
     "_rocm_C.abi3.so",
+    "third_party/deep_gemm/_C*.so",
 )
 
 

cmake/external_projects/deepgemm.cmake

@@ -32,8 +32,8 @@ else()
   # Pinned to the fork's dev branch: upstream's 26/09/30 release (2.8.1)
   # plus the SM120 port, the SM90 paged-MQA kv_block=32/next_n=4 port,
   # configurable SwiGLU alpha/beta, SiTU for FP8/FP4 Mega MoE, and NVFP4
-  # Mega MoE. TORCH_STABLE_LIBRARY build with a CPython 3.10 stable-ABI floor.
-  set(_DEEPGEMM_UPSTREAM_TAG "a981d8e3a58e877b7f53e63707de5834312fb710")
+  # Mega MoE. TORCH_LIBRARY build with a CPython 3.10 stable-ABI floor.
+  set(_DEEPGEMM_UPSTREAM_TAG "6ce1c5ec6627a6bf11dbcc698b0b1e19c9248432")
 
   set(_deepgemm_fc_root "${FETCHCONTENT_BASE_DIR}")
   if(NOT _deepgemm_fc_root)

tools/install_deepgemm.sh

@@ -10,7 +10,7 @@ DEEPGEMM_GIT_REPO="https://github.com/vllm-project/DeepGEMM.git"
 # NOTE: This targets the vLLM fork's dev branch: upstream's 26/09/30 release
 # plus the sm120 and sm90 paged-MQA ports, the SwiGLU alpha/beta and SiTU
 # Mega MoE activations, and NVFP4 Mega MoE.
-DEEPGEMM_GIT_REF="a981d8e3a58e877b7f53e63707de5834312fb710"
+DEEPGEMM_GIT_REF="6ce1c5ec6627a6bf11dbcc698b0b1e19c9248432"
 WHEEL_DIR=""
 
 # Parse command line arguments