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Patch series "kmsan: Enable on s390", v7. Architectures use assembly code to initialize ftrace_regs and call ftrace_ops_list_func(). Therefore, from the KMSAN's point of view, ftrace_regs is poisoned on ftrace_ops_list_func entry(). This causes KMSAN warnings when running the ftrace testsuite. Fix by trusting the architecture-specific assembly code and always unpoisoning ftrace_regs in ftrace_ops_list_func. The issue was not encountered on x86_64 so far only by accident: assembly-allocated ftrace_regs was overlapping a stale partially unpoisoned stack frame. Poisoning stack frames before returns [1] makes the issue appear on x86_64 as well. [1] https://github.com/iii-i/llvm-project/commits/msan-poison-allocas-before-returning-2024-06-12/ Link: https://lkml.kernel.org/r/20240621113706.315500-1-iii@linux.ibm.com Link: https://lkml.kernel.org/r/20240621113706.315500-2-iii@linux.ibm.com Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: <kasan-dev@googlegroups.com> Cc: Marco Elver <elver@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vlastimil Babka <vbabka@suse.cz> 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 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.