From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- include/memory/renesas-rpc-if.h | 83 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 include/memory/renesas-rpc-if.h (limited to 'include/memory') diff --git a/include/memory/renesas-rpc-if.h b/include/memory/renesas-rpc-if.h new file mode 100644 index 000000000..53663c4e5 --- /dev/null +++ b/include/memory/renesas-rpc-if.h @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Renesas RPC-IF core driver + * + * Copyright (C) 2018~2019 Renesas Solutions Corp. + * Copyright (C) 2019 Macronix International Co., Ltd. + * Copyright (C) 2019-2020 Cogent Embedded, Inc. + */ + +#ifndef __RENESAS_RPC_IF_H +#define __RENESAS_RPC_IF_H + +#include +#include + +enum rpcif_data_dir { + RPCIF_NO_DATA, + RPCIF_DATA_IN, + RPCIF_DATA_OUT, +}; + +struct rpcif_op { + struct { + u8 buswidth; + u8 opcode; + bool ddr; + } cmd, ocmd; + + struct { + u8 nbytes; + u8 buswidth; + bool ddr; + u64 val; + } addr; + + struct { + u8 ncycles; + u8 buswidth; + } dummy; + + struct { + u8 nbytes; + u8 buswidth; + bool ddr; + u32 val; + } option; + + struct { + u8 buswidth; + unsigned int nbytes; + enum rpcif_data_dir dir; + bool ddr; + union { + void *in; + const void *out; + } buf; + } data; +}; + +enum rpcif_type { + RPCIF_RCAR_GEN3, + RPCIF_RCAR_GEN4, + RPCIF_RZ_G2L, + XSPI_RZ_G3E, +}; + +struct rpcif { + struct device *dev; + void __iomem *dirmap; + size_t size; + bool xspi; +}; + +int rpcif_sw_init(struct rpcif *rpc, struct device *dev); +int rpcif_hw_init(struct device *dev, bool hyperflash); +void rpcif_prepare(struct device *dev, const struct rpcif_op *op, u64 *offs, + size_t *len); +int rpcif_manual_xfer(struct device *dev); +ssize_t rpcif_dirmap_read(struct device *dev, u64 offs, size_t len, void *buf); +ssize_t xspi_dirmap_write(struct device *dev, u64 offs, size_t len, + const void *buf); + +#endif // __RENESAS_RPC_IF_H -- cgit v1.3.1