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[cherry-pick] Fix the race condition in cumsum operator (#42205) #42500

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May 6, 2022
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[cherry-pick] Fix the race condition in cumsum operator (#42205) #42500

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12 changes: 5 additions & 7 deletions paddle/phi/kernels/gpu/cumsum_kernel.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,12 @@ __device__ void BlockReverse(
int tx = threadIdx.x;

int offset = tx;
int in_index = src_base + offset;
if (offset >= valid_item) {
sh_mem[offset] = 0;
} else {
int sh_mem_index = BLOCK_SIZE - offset - 1;
T data = idata[in_index];
sh_mem[sh_mem_index] = data;
T src_data = 0;
int src_offset = BLOCK_SIZE - offset - 1;
if (src_offset < valid_item) {
src_data = idata[src_base + src_offset];
}
sh_mem[offset] = src_data;

__syncthreads();
int out_index = dst_base - offset;
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