---
id: pr-flashinfer-1208
repo: flashinfer-ai/flashinfer
pr: 1208
title: Fix the issue with auxillary kernel launch and grid dim calculation
author: Anerudhan
date: '2025-07-03'
url: https://github.com/flashinfer-ai/flashinfer/pull/1208
source_category: upstream-code
architectures:
- sm100
tags:
- prefill
techniques: []
hardware_features: []
kernel_types:
- prefill
languages:
- cuda-cpp
captured_at: '2026-04-17'
status: merged
merge_sha: ed95a4aec6cc418b4bc658de73dac4d33dbb92ba
inclusion_reason: kernel file changes
changed_paths:
- csrc/cudnn_sdpa_kernel_launcher.cu
- flashinfer/cudnn/prefill.py
head_ref_oid: 8db0dd3769db8a10c1ed67269876142abb30aea5
artifact_dir: evidence/pull-bundles/flashinfer/gh-1208
---
# Fix the issue with auxillary kernel launch and grid dim calculation

- Repository: `flashinfer-ai/flashinfer`
- PR: [1208](https://github.com/flashinfer-ai/flashinfer/pull/1208)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/cudnn_sdpa_kernel_launcher.cu`
- `flashinfer/cudnn/prefill.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-1208`
