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[ Upstream commit 4ee812f6143d78d8ba1399671d78c8d78bf2817c ] In the vmx crypto Makefile we assign to a variable called TARGET and pass that to the aesp8-ppc.pl and ghashp8-ppc.pl scripts. The variable is meant to describe what flavour of powerpc we're building for, eg. either 32 or 64-bit, and big or little endian. Unfortunately TARGET is a fairly common name for a make variable, and if it happens that TARGET is specified as a command line parameter to make, the value specified on the command line will override our value. In particular this can happen if the kernel Makefile is driven by an external Makefile that uses TARGET for something. This leads to weird build failures, eg: nonsense at /build/linux/drivers/crypto/vmx/ghashp8-ppc.pl line 45. /linux/drivers/crypto/vmx/Makefile:20: recipe for target 'drivers/crypto/vmx/ghashp8-ppc.S' failed Which shows that we passed an empty value for $(TARGET) to the perl script, confirmed with make V=1: perl /linux/drivers/crypto/vmx/ghashp8-ppc.pl > drivers/crypto/vmx/ghashp8-ppc.S We can avoid this confusion by using override, to tell make that we don't want anything to override our variable, even a value specified on the command line. We can also use a less common name, given the script calls it "flavour", let's use that. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.