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/of.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 arch/powerpc/boot/of.h (limited to 'arch/powerpc/boot/of.h') diff --git a/arch/powerpc/boot/of.h b/arch/powerpc/boot/of.h new file mode 100644 index 000000000..31b2f5dfd --- /dev/null +++ b/arch/powerpc/boot/of.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _PPC_BOOT_OF_H_ +#define _PPC_BOOT_OF_H_ + +#include "swab.h" + +typedef void *phandle; +typedef u32 ihandle; + +void of_init(void *promptr); +int of_call_prom(const char *service, int nargs, int nret, ...); +unsigned int of_claim(unsigned long virt, unsigned long size, + unsigned long align); +void *of_vmlinux_alloc(unsigned long size); +void of_exit(void); +void *of_finddevice(const char *name); +int of_getprop(const void *phandle, const char *name, void *buf, + const int buflen); +int of_setprop(const void *phandle, const char *name, const void *buf, + const int buflen); + +/* Console functions */ +void of_console_init(void); + +typedef u16 __be16; +typedef u32 __be32; +typedef u64 __be64; + +#ifdef __LITTLE_ENDIAN__ +#define cpu_to_be16(x) swab16(x) +#define be16_to_cpu(x) swab16(x) +#define cpu_to_be32(x) swab32(x) +#define be32_to_cpu(x) swab32(x) +#define cpu_to_be64(x) swab64(x) +#define be64_to_cpu(x) swab64(x) +#else +#define cpu_to_be16(x) (x) +#define be16_to_cpu(x) (x) +#define cpu_to_be32(x) (x) +#define be32_to_cpu(x) (x) +#define cpu_to_be64(x) (x) +#define be64_to_cpu(x) (x) +#endif + +#define PROM_ERROR (-1u) + +#endif /* _PPC_BOOT_OF_H_ */ -- cgit v1.3.1