add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/hwtracing/coresight/coresight-tmc-etr.c
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@@ -47,7 +47,8 @@
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 };
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 /* Convert the perf index to an offset within the ETR buffer */
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-#define PERF_IDX2OFF(idx, buf)	((idx) % ((buf)->nr_pages << PAGE_SHIFT))
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+#define PERF_IDX2OFF(idx, buf)		\
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+		((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
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 /* Lower limit for ETR hardware buffer */
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 #define TMC_ETR_PERF_MIN_BUF_SIZE	SZ_1M
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@@ -944,7 +945,7 @@
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 	len = tmc_etr_buf_get_data(etr_buf, offset,
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 				   CORESIGHT_BARRIER_PKT_SIZE, &bufp);
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-	if (WARN_ON(len < CORESIGHT_BARRIER_PKT_SIZE))
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+	if (WARN_ON(len < 0 || len < CORESIGHT_BARRIER_PKT_SIZE))
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 		return -EINVAL;
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 	coresight_insert_barrier_packet(bufp);
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 	return offset + CORESIGHT_BARRIER_PKT_SIZE;
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@@ -1250,7 +1251,7 @@
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 	 * than the size requested via sysfs.
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 	 */
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 	if ((nr_pages << PAGE_SHIFT) > drvdata->size) {
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-		etr_buf = tmc_alloc_etr_buf(drvdata, (nr_pages << PAGE_SHIFT),
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+		etr_buf = tmc_alloc_etr_buf(drvdata, ((ssize_t)nr_pages << PAGE_SHIFT),
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 					    0, node, NULL);
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 		if (!IS_ERR(etr_buf))
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 			goto done;