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Separate the interrupt and syscall exit handling. Syscall exit does not require to clear the user_irq bit as it can't be set. On interrupt exit it can be set when the interrupt did not result in a scheduling event and therefore the return path did not invoke the TIF work handling, which would have cleared it. The debug check for the event state is also not really required even when debug mode is enabled via the static key. Debug mode is largely aiding user space by enabling a larger amount of validation checks, which cause a segfault when a malformed critical section is detected. In production mode the critical section handling takes the content mostly as is and lets user space keep the pieces when it screwed up. On kernel changes in that area the state check is useful, but that can be done when lockdep is enabled, which is anyway a required test scenario for fundamental changes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/20251027084307.842785700@linutronix.de
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.