On Wed, Nov 22, 2023 at 05:03:20PM -0800, Charlie Jenkins wrote: > + > +/** > + * Enable userspace to emit icache flushing instructions. > + * > + * When in per-process context, there may be multiple threads using the same mm. > + * Therefore, the icache can never be assumed clean when. Multiple threads in > + * the process may modify instructions in the mm concurrently. > + * > + * In per-thread context, it can be assumed that all modifications to > + * instructions in memory will be performed by this thread. When the thread is > + * migrated the icache will be flushed. > + * > + * @arg arg: Sets the type of context > + * - PR_RISCV_CTX_SW_FENCEI: Allow fence.i in userspace. Another fence.i will > + * emitted on thread/process migration. > + * @arg per_thread: When set to 0, will use the default behavior of setting the > + * icache flush context per process. When set to 1, will use a per thread > + * context. > + */ FYI, this is not valid kerneldoc and breaks allmodconfig builds: arch/riscv/mm/cacheflush.c:159: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst > +int riscv_set_icache_flush_ctx(unsigned long ctx, unsigned long per_thread) Cheers, Conor.
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