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/mips/sni/setup.c | 265 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 265 insertions(+) create mode 100644 arch/mips/sni/setup.c (limited to 'arch/mips/sni/setup.c') diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c new file mode 100644 index 000000000..fc7da1228 --- /dev/null +++ b/arch/mips/sni/setup.c @@ -0,0 +1,265 @@ +/* + * Setup pointers to hardware-dependent routines. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org) + * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de) + */ +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_FW_ARC +#include +#include +#endif + +#ifdef CONFIG_FW_SNIPROM +#include +#endif + +#include +#include +#include +#include +#include + +unsigned int sni_brd_type; +EXPORT_SYMBOL(sni_brd_type); + +extern void sni_machine_restart(char *command); +extern void sni_machine_power_off(void); + +static void __init sni_display_setup(void) +{ +#if defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC) + static struct screen_info si; + DISPLAY_STATUS *di; + + di = ArcGetDisplayStatus(1); + + if (di) { + si.orig_x = di->CursorXPosition; + si.orig_y = di->CursorYPosition; + si.orig_video_cols = di->CursorMaxXPosition; + si.orig_video_lines = di->CursorMaxYPosition; + si.orig_video_isVGA = VIDEO_TYPE_VGAC; + si.orig_video_points = 16; + + vgacon_register_screen(&si); + } +#endif +} + +static void __init sni_console_setup(void) +{ +#ifndef CONFIG_FW_ARC + char *ctype; + char *cdev; + char *baud; + int port; + static char options[8] __initdata; + + cdev = prom_getenv("console_dev"); + if (strncmp(cdev, "tty", 3) == 0) { + ctype = prom_getenv("console"); + switch (*ctype) { + default: + case 'l': + port = 0; + baud = prom_getenv("lbaud"); + break; + case 'r': + port = 1; + baud = prom_getenv("rbaud"); + break; + } + if (baud) + strscpy(options, baud); + if (strncmp(cdev, "tty552", 6) == 0) + add_preferred_console("ttyS", port, + baud ? options : NULL); + else + add_preferred_console("ttySC", port, + baud ? options : NULL); + } +#endif +} + +#ifdef DEBUG +static void __init sni_idprom_dump(void) +{ + int i; + + pr_debug("SNI IDProm dump:\n"); + for (i = 0; i < 256; i++) { + if (i%16 == 0) + pr_debug("%04x ", i); + + printk("%02x ", *(unsigned char *) (SNI_IDPROM_BASE + i)); + + if (i % 16 == 15) + printk("\n"); + } +} +#endif + +void __init plat_mem_setup(void) +{ + int cputype; + + set_io_port_base(SNI_PORT_BASE); +// ioport_resource.end = sni_io_resource.end; + + /* + * Setup (E)ISA I/O memory access stuff + */ +#ifdef CONFIG_EISA + EISA_bus = 1; +#endif + + sni_brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE; + cputype = *(unsigned char *)SNI_IDPROM_CPUTYPE; + switch (sni_brd_type) { + case SNI_BRD_TOWER_OASIC: + switch (cputype) { + case SNI_CPU_M8030: + system_type = "RM400-330"; + break; + case SNI_CPU_M8031: + system_type = "RM400-430"; + break; + case SNI_CPU_M8037: + system_type = "RM400-530"; + break; + case SNI_CPU_M8034: + system_type = "RM400-730"; + break; + default: + system_type = "RM400-xxx"; + break; + } + break; + case SNI_BRD_MINITOWER: + switch (cputype) { + case SNI_CPU_M8021: + case SNI_CPU_M8043: + system_type = "RM400-120"; + break; + case SNI_CPU_M8040: + system_type = "RM400-220"; + break; + case SNI_CPU_M8053: + system_type = "RM400-225"; + break; + case SNI_CPU_M8050: + system_type = "RM400-420"; + break; + default: + system_type = "RM400-xxx"; + break; + } + break; + case SNI_BRD_PCI_TOWER: + system_type = "RM400-Cxx"; + break; + case SNI_BRD_RM200: + system_type = "RM200-xxx"; + break; + case SNI_BRD_PCI_MTOWER: + system_type = "RM300-Cxx"; + break; + case SNI_BRD_PCI_DESKTOP: + switch (read_c0_prid() & PRID_IMP_MASK) { + case PRID_IMP_R4600: + case PRID_IMP_R4700: + system_type = "RM200-C20"; + break; + case PRID_IMP_R5000: + system_type = "RM200-C40"; + break; + default: + system_type = "RM200-Cxx"; + break; + } + break; + case SNI_BRD_PCI_TOWER_CPLUS: + system_type = "RM400-Exx"; + break; + case SNI_BRD_PCI_MTOWER_CPLUS: + system_type = "RM300-Exx"; + break; + } + pr_debug("Found SNI brdtype %02x name %s\n", sni_brd_type, system_type); + +#ifdef DEBUG + sni_idprom_dump(); +#endif + + switch (sni_brd_type) { + case SNI_BRD_10: + case SNI_BRD_10NEW: + case SNI_BRD_TOWER_OASIC: + case SNI_BRD_MINITOWER: + sni_a20r_init(); + break; + + case SNI_BRD_PCI_TOWER: + case SNI_BRD_PCI_TOWER_CPLUS: + sni_pcit_init(); + break; + + case SNI_BRD_RM200: + sni_rm200_init(); + break; + + case SNI_BRD_PCI_MTOWER: + case SNI_BRD_PCI_DESKTOP: + case SNI_BRD_PCI_MTOWER_CPLUS: + sni_pcimt_init(); + break; + } + + _machine_restart = sni_machine_restart; + pm_power_off = sni_machine_power_off; + + sni_display_setup(); + sni_console_setup(); +} + +#ifdef CONFIG_PCI + +#include +#include