add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/xdp/xdp_umem.c
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@@ -153,10 +153,11 @@
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 static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
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 {
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-	u32 npgs_rem, chunk_size = mr->chunk_size, headroom = mr->headroom;
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 	bool unaligned_chunks = mr->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG;
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-	u64 npgs, addr = mr->addr, size = mr->len;
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-	unsigned int chunks, chunks_rem;
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+	u32 chunk_size = mr->chunk_size, headroom = mr->headroom;
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+	u64 addr = mr->addr, size = mr->len;
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+	u32 chunks_rem, npgs_rem;
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+	u64 chunks, npgs;
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 	int err;
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 	if (chunk_size < XDP_UMEM_MIN_CHUNK_SIZE || chunk_size > PAGE_SIZE) {
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@@ -191,8 +192,8 @@
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 	if (npgs > U32_MAX)
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 		return -EINVAL;
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-	chunks = (unsigned int)div_u64_rem(size, chunk_size, &chunks_rem);
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-	if (chunks == 0)
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+	chunks = div_u64_rem(size, chunk_size, &chunks_rem);
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+	if (!chunks || chunks > U32_MAX)
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 		return -EINVAL;
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 	if (!unaligned_chunks && chunks_rem)
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@@ -205,7 +206,7 @@
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 	umem->headroom = headroom;
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 	umem->chunk_size = chunk_size;
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 	umem->chunks = chunks;
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-	umem->npgs = (u32)npgs;
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+	umem->npgs = npgs;
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 	umem->pgs = NULL;
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 	umem->user = NULL;
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 	umem->flags = mr->flags;