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CC_FLAGS_FTRACE is exported and later used to remove ftrace relevant build flags from files which should be built without ftrace support. For that reason add -mfentry to CC_FLAGS_FTRACE as well. That fixes a problem with vdso32 build on s390, where -mfentry could not be used together with -m31 flag. At the same time flags like -pg and -mfentry are not relevant for asm files, so avoid adding them to KBUILD_AFLAGS. Introduce CC_FLAGS_USING instead of CC_USING_FENTRY to collect -DCC_USING_FENTRY (and future alike) which are relevant for both KBUILD_CFLAGS and KBUILD_AFLAGS. Link: http://lkml.kernel.org/r/patch-1.thread-aa7b8d.git-42971afe87de.your-ad-here.call-01533557518-ext-9465@work.hours Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.