在 2020/9/1 下午9:17, Matthew Wilcox 写道: > On Tue, Sep 01, 2020 at 02:30:51PM +0800, Alex Shi wrote: >> seems there are couples archs can not do cmpxchg1 >> So update the patch here. And it's easy to fix if more arch issue find here. > >> +/* >> + * cmpxchg only support 32-bits operands on the following archs ARMv6, SPARC32 >> + * sh2, XTENSA. >> + */ >> +#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_SH2) || \ >> + defined(CONFIG_SPARC32) || defined(CONFIG_XTENSA) > > Looks like we need a HAVE_CMPXCHG_BYTE in Kconfig to parallel > HAVE_CMPXCHG_DOUBLE. > Thanks for reminder! Compare the HAVE_CMPXCHG_BYTE, NO_CMPXCHG_BYTE would be better for less code change. I will send the v4 for a bit more change on patch 2. Thanks! Alex
