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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Feb 22, 2024 at 10:04:18PM +0800, Gang Li wrote: > hugetlb parallelization depends on PADATA, and PADATA depends on SMP. > > PADATA consists of two distinct functionality: One part is > padata_do_multithreaded which disregards order and simply divides > tasks into several groups for parallel execution. Hugetlb > init parallelization depends on padata_do_multithreaded. > > The other part is composed of a set of APIs that, while handling data in > an out-of-order parallel manner, can eventually return the data with > ordered sequence. Currently Only `crypto/pcrypt.c` use them. > > All users of PADATA of non-SMP case currently only use > padata_do_multithreaded. It is easy to implement a serial one in > include/linux/padata.h. And it is not necessary to implement another > functionality unless the only user of crypto/pcrypt.c does not depend on > SMP in the future. > > Signed-off-by: Gang Li > Tested-by: Paul E. McKenney > --- > include/linux/padata.h | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/include/linux/padata.h b/include/linux/padata.h > index 8f418711351bc..0146daf344306 100644 > --- a/include/linux/padata.h > +++ b/include/linux/padata.h > @@ -180,10 +180,6 @@ struct padata_instance { > > #ifdef CONFIG_PADATA > extern void __init padata_init(void); > -#else > -static inline void __init padata_init(void) {} > -#endif > - > extern struct padata_instance *padata_alloc(const char *name); > extern void padata_free(struct padata_instance *pinst); > extern struct padata_shell *padata_alloc_shell(struct padata_instance *pinst); > @@ -194,4 +190,12 @@ extern void padata_do_serial(struct padata_priv *padata); > extern void __init padata_do_multithreaded(struct padata_mt_job *job); > extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, > cpumask_var_t cpumask); > +#else > +static inline void __init padata_init(void) {} > +static inline void __init padata_do_multithreaded(struct padata_mt_job *job) > +{ An early return here for zero-sized jobs is consistent with the CONFIG_PADATA version and avoids hugetlb_pages_alloc_boot taking a lock and flushing the tlb when there's no work to do. With that, Acked-by: Daniel Jordan > + job->thread_fn(job->start, job->start + job->size, job->fn_arg); > +} > +#endif > + > #endif > -- > 2.20.1 >