linux-kernel - arm64 build failure with CONFIG_ARM64_LSE

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Date:   Wed, 2 Nov 2016 17:44:27 +0100
From:   Artem Savkov <asavkov@...hat.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: arm64 build failure with CONFIG_ARM64_LSE_ATOMICS=y

Hello Catalin,

Looks like your patch "efd9e03 arm64: Use static keys for CPU features"
breaks arm64 build with "CONFIG_ARM64_LSE_ATOMICS=y" because it creates a
circular dependency for asm/lse.h through jump_label.h:

  CC      arch/arm64/kernel/asm-offsets.s
In file included from ./arch/arm64/include/asm/atomic.h:34:0,
                 from ./include/linux/atomic.h:4,
                 from ./include/linux/jump_label.h:169,
                 from ./arch/arm64/include/asm/cpufeature.h:12,
                 from ./arch/arm64/include/asm/alternative.h:4,
                 from ./arch/arm64/include/asm/lse.h:7,
                 from ./arch/arm64/include/asm/spinlock.h:19,
                 from ./include/linux/spinlock.h:87,
                 from ./include/linux/seqlock.h:35,
                 from ./include/linux/time.h:5,
                 from ./include/uapi/linux/timex.h:56,
                 from ./include/linux/timex.h:56,
                 from ./include/linux/sched.h:19,
                 from arch/arm64/kernel/asm-offsets.c:21:
./arch/arm64/include/asm/atomic_lse.h: In function ‘atomic_andnot’:
./arch/arm64/include/asm/atomic_lse.h:35:15: error: expected string literal before ‘ARM64_LSE_ATOMIC_INSN’
  asm volatile(ARM64_LSE_ATOMIC_INSN(__LL_SC_ATOMIC(op),  \

...

./arch/arm64/include/asm/cmpxchg.h: In function ‘__xchg_case_1’:
./arch/arm64/include/asm/cmpxchg.h:38:15: error: expected string literal before ‘ARM64_LSE_ATOMIC_INSN’
  asm volatile(ARM64_LSE_ATOMIC_INSN(    \

-- 
Regards,
  Artem