Messages in this thread | | | From | Uros Bizjak <> | Date | Sun, 30 Dec 2018 12:07:13 +0100 | Subject | Re: [PATCH] x86/asm: Use CC_SET/CC_OUT in percpu_cmpxchg16b_double |
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On 12/28/18, Uros Bizjak <ubizjak@gmail.com> wrote: > Use CC_SET(z)/CC_OUT(z) instead of explicit setz instruction. > Using these two defines, the compiler that supports generation of > condition code outputs from inline assembly flags generates one > conditional jump instruction, e.g:
Unfortunatelly, the 0day kernel test robot reports:
[ 1.569154] DEBUG_LOCKS_WARN_ON(unlikely(early_boot_irqs_disabled)) [ 1.569287] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:2803 lockdep_hardirqs_on+0xc5/0x19e
presumably due to unconditional interrupt enable in this_cpu_cmpxchg16b_emu. I have to somehow disable X86_FATURE_CX16 and thoroughly test the library path.
Uros.
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