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The powerpc architecture was the only one that defined arch_trigger_cpumask_backtrace() in asm/nmi.h instead of asm/irq.h. Move it to be consistent. This fixes compile time errors introduced by commit7ca8fe94aa("watchdog/hardlockup: define HARDLOCKUP_DETECTOR_ARCH"). That commit caused <asm/nmi.h> to stop being included if the hardlockup detector wasn't enabled. The specific errors were: error: implicit declaration of function `nmi_cpu_backtrace' error: implicit declaration of function `nmi_trigger_cpumask_backtrace' NOTE: when moving this into irq.h, we also change the guards from just checking if "CONFIG_NMI_IPI" is defined to also checking if "CONFIG_PPC_BOOK3S_64" is defined. This matches the code in arch/powerpc/kernel/stacktrace.c. Previously this worked because <asm.nmi.h> was included if "CONFIG_HAVE_HARDLOCKUP_DETECTOR_ARCH" was defined. For powerpc that's only selected if "CONFIG_PPC_BOOK3S_64" is defined. [dianders@chromium.org: change the guards to include CONFIG_PPC_BOOK3S_64] Link: https://lkml.kernel.org/r/20230622202816.v2.1.Ice67126857506712559078e7de26d32d26e64631@changeid Link: https://lkml.kernel.org/r/20230621164809.1.Ice67126857506712559078e7de26d32d26e64631@changeid Fixes:7ca8fe94aa("watchdog/hardlockup: define HARDLOCKUP_DETECTOR_ARCH") Signed-off-by: Douglas Anderson <dianders@chromium.org> Reported-by: Michael Ellerman <mpe@ellerman.id.au> Closes: https://lore.kernel.org/r/871qi5otdh.fsf@mail.lhotse Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Douglas Anderson <dianders@chromium.org> Cc: Laurent Dufour <ldufour@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Tom Rix <trix@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.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.