selftests/ftrace: Fix unique symbol check in kprobe_non_uniq_symbol.tcgrafted

The current regex also matches symbols in modules, which makes the
test fail on s390 where name_show is present only once in the kernel,
but also multiple times in modules:

000001b1401cdc20 t name_show
000001b0c05e6c40 t name_show    [mdev]
000001b0c0495f30 t name_show    [i2c_core]

Fix this by changing the regular expression to only match the function
name.

Link: https://lore.kernel.org/all/20260909092954.2200558-1-svens@linux.ibm.com/

Fixes: 03b80ff8023a ("selftests/ftrace: Add new test case which checks non unique symbol")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c
new file mode 100644
index 000000000..328da73b6
--- /dev/null
+++ b/drivers/block/n64cart.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for the N64 cart.
+ *
+ * Copyright (c) 2021 Lauri Kasanen
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bitops.h>
+#include <linux/blkdev.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+
+enum {
+	PI_DRAM_REG = 0,
+	PI_CART_REG,
+	PI_READ_REG,
+	PI_WRITE_REG,
+	PI_STATUS_REG,
+};
+
+#define PI_STATUS_DMA_BUSY	(1 << 0)
+#define PI_STATUS_IO_BUSY	(1 << 1)
+
+#define CART_DOMAIN		0x10000000
+#define CART_MAX		0x1FFFFFFF
+
+#define MIN_ALIGNMENT		8
+
+static u32 __iomem *reg_base;
+
+static unsigned int start;
+module_param(start, uint, 0);
+MODULE_PARM_DESC(start, "Start address of the cart block data");
+
+static unsigned int size;
+module_param(size, uint, 0);
+MODULE_PARM_DESC(size, "Size of the cart block data, in bytes");
+
+static void n64cart_write_reg(const u8 reg, const u32 value)
+{
+	writel(value, reg_base + reg);
+}
+
+static u32 n64cart_read_reg(const u8 reg)
+{
+	return readl(reg_base + reg);
+}
+
+static void n64cart_wait_dma(void)
+{
+	while (n64cart_read_reg(PI_STATUS_REG) &
+		(PI_STATUS_DMA_BUSY | PI_STATUS_IO_BUSY))
+		cpu_relax();
+}
+
+/*
+ * Process a single bvec of a bio.
+ */
+static bool n64cart_do_bvec(struct device *dev, struct bio_vec *bv, u32 pos)
+{
+	dma_addr_t dma_addr;
+	const u32 bstart = pos + start;
+
+	/* Alignment check */
+	WARN_ON_ONCE((bv->bv_offset & (MIN_ALIGNMENT - 1)) ||
+		     (bv->bv_len & (MIN_ALIGNMENT - 1)));
+
+	dma_addr = dma_map_bvec(dev, bv, DMA_FROM_DEVICE, 0);
+	if (dma_mapping_error(dev, dma_addr))
+		return false;
+
+	n64cart_wait_dma();
+
+	n64cart_write_reg(PI_DRAM_REG, dma_addr);
+	n64cart_write_reg(PI_CART_REG, (bstart | CART_DOMAIN) & CART_MAX);
+	n64cart_write_reg(PI_WRITE_REG, bv->bv_len - 1);
+
+	n64cart_wait_dma();
+
+	dma_unmap_page(dev, dma_addr, bv->bv_len, DMA_FROM_DEVICE);
+	return true;
+}
+
+static void n64cart_submit_bio(struct bio *bio)
+{
+	struct bio_vec bvec;
+	struct bvec_iter iter;
+	struct device *dev = bio->bi_bdev->bd_disk->private_data;
+	u32 pos = bio->bi_iter.bi_sector << SECTOR_SHIFT;
+
+	bio_for_each_segment(bvec, bio, iter) {
+		if (!n64cart_do_bvec(dev, &bvec, pos)) {
+			bio_io_error(bio);
+			return;
+		}
+		pos += bvec.bv_len;
+	}
+
+	bio_endio(bio);
+}
+
+static const struct block_device_operations n64cart_fops = {
+	.owner		= THIS_MODULE,
+	.submit_bio	= n64cart_submit_bio,
+};
+
+/*
+ * The target device is embedded and RAM-constrained. We save RAM
+ * by initializing in __init code that gets dropped late in boot.
+ * For the same reason there is no module or unloading support.
+ */
+static int __init n64cart_probe(struct platform_device *pdev)
+{
+	struct queue_limits lim = {
+		.physical_block_size	= 4096,
+		.logical_block_size	= 4096,
+	};
+	struct gendisk *disk;
+	int err = -ENOMEM;
+
+	if (!start || !size) {
+		pr_err("start or size not specified\n");
+		return -ENODEV;
+	}
+
+	if (size & 4095) {
+		pr_err("size must be a multiple of 4K\n");
+		return -ENODEV;
+	}
+
+	reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(reg_base))
+		return PTR_ERR(reg_base);
+
+	disk = blk_alloc_disk(&lim, NUMA_NO_NODE);
+	if (IS_ERR(disk)) {
+		err = PTR_ERR(disk);
+		goto out;
+	}
+
+	disk->first_minor = 0;
+	disk->flags = GENHD_FL_NO_PART;
+	disk->fops = &n64cart_fops;
+	disk->private_data = &pdev->dev;
+	strscpy(disk->disk_name, "n64cart");
+
+	set_capacity(disk, size >> SECTOR_SHIFT);
+	set_disk_ro(disk, 1);
+
+	err = add_disk(disk);
+	if (err)
+		goto out_cleanup_disk;
+
+	pr_info("n64cart: %u kb disk\n", size / 1024);
+
+	return 0;
+
+out_cleanup_disk:
+	put_disk(disk);
+out:
+	return err;
+}
+
+static struct platform_driver n64cart_driver = {
+	.driver = {
+		.name = "n64cart",
+	},
+};
+
+static int __init n64cart_init(void)
+{
+	return platform_driver_probe(&n64cart_driver, n64cart_probe);
+}
+
+module_init(n64cart_init);
+
+MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
+MODULE_DESCRIPTION("Driver for the N64 cart");
+MODULE_LICENSE("GPL");