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With bintils >= 2.38 the ppc64_book3e_allmodconfig build fails:
{standard input}: Assembler messages:
{standard input}:196: Error: unrecognized opcode: `lbarx'
{standard input}:196: Error: unrecognized opcode: `stbcx.'
make[5]: *** [scripts/Makefile.build:252: arch/powerpc/mm/nohash/e500_hugetlbpage.o] Error 1
That happens because the default CPU for that config is e5500, set via
CONFIG_TARGET_CPU, and so the assembler is building for e5500, which
doesn't support those instructions.
Fix it by using machine directives to tell the assembler to assemble the
relevant code for e6500, which does support lbarx/stbcx.
That is safe because the code already has the CPU_FTR_SMT check, which
ensures the lbarx sequence doesn't run on e5500, which doesn't support
SMT.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230213112322.998003-1-mpe@ellerman.id.au
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.