mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-04 02:02:28 +09:00
2d226c1e1c
Almost all functions in entry-common.c are marked notrace, with el1_undef and el1_inv being the only exceptions. We appear to have done this on the assumption that there were no exception registers that we needed to snapshot, and thus it was safe to run trace code that might result in further exceptions and clobber those registers. However, until we inherit the DAIF flags, our irq flag tracing is stale, and this discrepancy could set off warnings in some configurations. For example if CONFIG_DEBUG_LOCKDEP is selected and a trace function calls into any flag-checking locking routines. Given we don't expect to trigger el1_undef or el1_inv unless something is already wrong, any irqflag warnigns are liable to mask the information we'd actually care about. Let's keep things simple and mark el1_undef and el1_inv as notrace. Developers can trace do_undefinstr and bad_mode if they really want to monitor these cases. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Will Deacon <will@kernel.org>
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 Restructured Text 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.