---
id: pr-flash-attention-2502
repo: Dao-AILab/flash-attention
pr: 2502
title: 'fix: typos and missing comments in FA4 cute kernel files'
author: dxasu
date: '2026-04-27'
url: https://github.com/Dao-AILab/flash-attention/pull/2502
source_category: upstream-code
architectures:
- sm100
tags:
- cute
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- cuda-cpp
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: eefa86de0e674cfd5843cf4af4a6169edbdbc788
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_bwd.py
- flash_attn/cute/interface.py
- flash_attn/cute/mask.py
- flash_attn/cute/softmax.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2502
head_ref_oid: 8bc459b12c8f690caa9012f1a1547d5ba51e634e
---
# fix: typos and missing comments in FA4 cute kernel files

- Repository: `Dao-AILab/flash-attention`
- PR: [2502](https://github.com/Dao-AILab/flash-attention/pull/2502)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `flash_attn/cute/flash_bwd.py`
- `flash_attn/cute/interface.py`
- `flash_attn/cute/mask.py`
- `flash_attn/cute/softmax.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2502`
