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b32baf91f6
Support for LSE atomic instructions (CONFIG_ARM64_LSE_ATOMICS) relies on a static key to select between the legacy LL/SC implementation which is available on all arm64 CPUs and the super-duper LSE implementation which is available on CPUs implementing v8.1 and later. Unfortunately, when building a kernel with CONFIG_JUMP_LABEL disabled (e.g. because the toolchain doesn't support 'asm goto'), the static key inside the atomics code tries to use atomics itself. This results in a mess of circular includes and a build failure: In file included from ./arch/arm64/include/asm/lse.h:11, from ./arch/arm64/include/asm/atomic.h:16, from ./include/linux/atomic.h:7, from ./include/asm-generic/bitops/atomic.h:5, from ./arch/arm64/include/asm/bitops.h:26, from ./include/linux/bitops.h:19, from ./include/linux/kernel.h:12, from ./include/asm-generic/bug.h:18, from ./arch/arm64/include/asm/bug.h:26, from ./include/linux/bug.h:5, from ./include/linux/page-flags.h:10, from kernel/bounds.c:10: ./include/linux/jump_label.h: In function ‘static_key_count’: ./include/linux/jump_label.h:254:9: error: implicit declaration of function ‘atomic_read’ [-Werror=implicit-function-declaration] return atomic_read(&key->enabled); ^~~~~~~~~~~ [ ... more of the same ... ] Since LSE atomic instructions are not critical to the operation of the kernel, make them depend on JUMP_LABEL at compile time. Reviewed-by: Andrew Murray <andrew.murray@arm.com> Signed-off-by: Will Deacon <will@kernel.org> |
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boot | ||
configs | ||
crypto | ||
include | ||
kernel | ||
kvm | ||
lib | ||
mm | ||
net | ||
xen | ||
Kconfig | ||
Kconfig.debug | ||
Kconfig.platforms | ||
Makefile |