On Tue, May 28, 2019 at 12:40:50AM +0200, Stefan Agner wrote: > The LLVM Target parser currently does not allow to specify the security > extension as part of -march (see also LLVM Bug 40186 [0]). When trying > to use Clang with LLVM's integrated assembler, this leads to build > errors such as this: > clang-8: error: the clang compiler does not support '-Wa,-march=armv7-a+sec' > > Use ".arch_extension sec" to enable the security extension in a more > portable fasion. Also make sure to use ".arch armv7-a" in case a v6/v7 > multi-platform kernel is being built. > > Note that this is technically not exactly the same as the old code > checked for availabilty of the security extension by calling as-instr. > However, there are already other sites which use ".arch_extension sec" > unconditionally, hence de-facto we need an assembler capable of > ".arch_extension sec" already today (arch/arm/mm/proc-v7.S). The > arch extension "sec" is available since binutils 2.21 according to > its documentation [1]. > > [0] https://bugs.llvm.org/show_bug.cgi?id=40186 > [1] https://sourceware.org/binutils/docs-2.21/as/ARM-Options.html > > Signed-off-by: Stefan Agner <[email protected]> > Acked-by: Mans Rullgard <[email protected]> > Acked-by: Arnd Bergmann <[email protected]> > Acked-by: Krzysztof Kozlowski <[email protected]> > --- > Changes since v1: > - Explicitly specify assembler architecture as armv7-a to avoid > build issues when bulding v6/v7 multi arch kernel. > > Changes since v2: > - Add armv7-a also in mach-tango > - Move .arch armv7-a outside of ifdef'ed area in sleep44xx.S > to make the kernel compile also without CONFIG_SMP/PM. > > Changes since v3: > - Rebase on top of v5.2-rc2
Thanks, applied to arm/soc. -Olof
