diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2026-09-02 09:55:01 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2026-09-02 11:08:21 -0400 |
| commit | 4617721c502b2ddaa4e324e86da4997edf738fa5 (patch) | |
| tree | 350aa83b47da0b574a814795392b20b0bed83cbc /arch/mips/alchemy/Kconfig | |
| download | linux-stable-4617721c502b2ddaa4e324e86da4997edf738fa5.tar.gz linux-stable-4617721c502b2ddaa4e324e86da4997edf738fa5.zip | |
ftrace: Synchronize the initialization of ftrace_opsgrafted
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 <rostedt@goodmis.org>
Diffstat (limited to 'arch/mips/alchemy/Kconfig')
| -rw-r--r-- | arch/mips/alchemy/Kconfig | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/mips/alchemy/Kconfig b/arch/mips/alchemy/Kconfig new file mode 100644 index 000000000..cf5ad52c0 --- /dev/null +++ b/arch/mips/alchemy/Kconfig @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 +choice + prompt "Machine type" + depends on MIPS_ALCHEMY + default MIPS_DB1XXX + +config MIPS_MTX1 + bool "4G Systems MTX-1 board" + select HAVE_PCI + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +config MIPS_DB1XXX + bool "Alchemy DB1XXX / PB1XXX boards" + select HAVE_PCI + select HAVE_PATA_PLATFORM + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + help + Select this option if you have one of the following Alchemy + development boards: DB1000 DB1500 DB1100 DB1550 DB1200 DB1300 + PB1500 PB1100 PB1550 PB1200 + Board type is autodetected during boot. + +config MIPS_XXS1500 + bool "MyCable XXS1500 board" + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +config MIPS_GPR + bool "Trapeze ITS GPR board" + select HAVE_PCI + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +endchoice |