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 --- arch/powerpc/boot/ppcboot.h | 95 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 arch/powerpc/boot/ppcboot.h (limited to 'arch/powerpc/boot/ppcboot.h') diff --git a/arch/powerpc/boot/ppcboot.h b/arch/powerpc/boot/ppcboot.h new file mode 100644 index 000000000..90c8f452f --- /dev/null +++ b/arch/powerpc/boot/ppcboot.h @@ -0,0 +1,95 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This interface is used for compatibility with old U-boots *ONLY*. + * Please do not imitate or extend this. + */ + +/* + * (C) Copyright 2000, 2001 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + */ + +#ifndef __PPCBOOT_H__ +#define __PPCBOOT_H__ + +/* + * Board information passed to kernel from PPCBoot + * + * include/asm-ppc/ppcboot.h + */ + +#include "types.h" + +typedef struct bd_info { + unsigned long bi_memstart; /* start of DRAM memory */ + unsigned long bi_memsize; /* size of DRAM memory in bytes */ + unsigned long bi_flashstart; /* start of FLASH memory */ + unsigned long bi_flashsize; /* size of FLASH memory */ + unsigned long bi_flashoffset; /* reserved area for startup monitor */ + unsigned long bi_sramstart; /* start of SRAM memory */ + unsigned long bi_sramsize; /* size of SRAM memory */ +#if defined(TARGET_8xx) || defined(TARGET_CPM2) || defined(TARGET_85xx) ||\ + defined(TARGET_83xx) || defined(TARGET_86xx) + unsigned long bi_immr_base; /* base of IMMR register */ +#endif +#if defined(TARGET_PPC_MPC52xx) + unsigned long bi_mbar_base; /* base of internal registers */ +#endif + unsigned long bi_bootflags; /* boot / reboot flag (for LynxOS) */ + unsigned long bi_ip_addr; /* IP Address */ + unsigned char bi_enetaddr[6]; /* Ethernet address */ + unsigned short bi_ethspeed; /* Ethernet speed in Mbps */ + unsigned long bi_intfreq; /* Internal Freq, in MHz */ + unsigned long bi_busfreq; /* Bus Freq, in MHz */ +#if defined(TARGET_CPM2) + unsigned long bi_cpmfreq; /* CPM_CLK Freq, in MHz */ + unsigned long bi_brgfreq; /* BRG_CLK Freq, in MHz */ + unsigned long bi_sccfreq; /* SCC_CLK Freq, in MHz */ + unsigned long bi_vco; /* VCO Out from PLL, in MHz */ +#endif +#if defined(TARGET_PPC_MPC52xx) + unsigned long bi_ipbfreq; /* IPB Bus Freq, in MHz */ + unsigned long bi_pcifreq; /* PCI Bus Freq, in MHz */ +#endif + unsigned long bi_baudrate; /* Console Baudrate */ +#if defined(TARGET_4xx) + unsigned char bi_s_version[4]; /* Version of this structure */ + unsigned char bi_r_version[32]; /* Version of the ROM (IBM) */ + unsigned int bi_procfreq; /* CPU (Internal) Freq, in Hz */ + unsigned int bi_plb_busfreq; /* PLB Bus speed, in Hz */ + unsigned int bi_pci_busfreq; /* PCI Bus speed, in Hz */ + unsigned char bi_pci_enetaddr[6]; /* PCI Ethernet MAC address */ +#endif +#if defined(TARGET_HYMOD) + hymod_conf_t bi_hymod_conf; /* hymod configuration information */ +#endif +#if defined(TARGET_EVB64260) || defined(TARGET_44x) || \ + defined(TARGET_85xx) || defined(TARGET_83xx) || defined(TARGET_HAS_ETH1) + /* second onboard ethernet port */ + unsigned char bi_enet1addr[6]; +#define HAVE_ENET1ADDR +#endif +#if defined(TARGET_EVB64260) || defined(TARGET_440GX) || \ + defined(TARGET_85xx) || defined(TARGET_HAS_ETH2) + /* third onboard ethernet ports */ + unsigned char bi_enet2addr[6]; +#define HAVE_ENET2ADDR +#endif +#if defined(TARGET_440GX) || defined(TARGET_HAS_ETH3) + /* fourth onboard ethernet ports */ + unsigned char bi_enet3addr[6]; +#define HAVE_ENET3ADDR +#endif +#if defined(TARGET_4xx) + unsigned int bi_opbfreq; /* OB clock in Hz */ + int bi_iic_fast[2]; /* Use fast i2c mode */ +#endif +#if defined(TARGET_440GX) + int bi_phynum[4]; /* phy mapping */ + int bi_phymode[4]; /* phy mode */ +#endif +} bd_t; + +#define bi_tbfreq bi_intfreq + +#endif /* __PPCBOOT_H__ */ -- cgit v1.3.1