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authorStefan Agner <stefan@agner.ch>2019-05-28 01:40:50 +0300
committerOlof Johansson <olof@lixom.net>2019-06-19 19:44:25 +0300
commit3fe1ee40b2a2db271513a498c475c13572dcb4c6 (patch)
tree64a85ad53e8d01b6443c4f1eb1146b5465dfa1c4 /arch/arm/mach-omap2/omap-smc.S
parent24cb4bc8f0c9ee346826f33e6dcbdbc533cc6ad8 (diff)
downloadlinux-3fe1ee40b2a2db271513a498c475c13572dcb4c6.tar.xz
ARM: use arch_extension directive instead of arch argument
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 <stefan@agner.ch> Acked-by: Mans Rullgard <mans@mansr.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-omap2/omap-smc.S')
-rw-r--r--arch/arm/mach-omap2/omap-smc.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/omap-smc.S b/arch/arm/mach-omap2/omap-smc.S
index 72506e6cf9e7..a14aee5e81d1 100644
--- a/arch/arm/mach-omap2/omap-smc.S
+++ b/arch/arm/mach-omap2/omap-smc.S
@@ -23,7 +23,8 @@
* link register "lr".
* Function signature : void omap_smc1(u32 fn, u32 arg)
*/
-
+ .arch armv7-a
+ .arch_extension sec
ENTRY(omap_smc1)
stmfd sp!, {r2-r12, lr}
mov r12, r0