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Also, clean up the comment a little bit. Use SZ_32M to define PROCESS_PAGES_NON_PREEMPT_BATCH instead of hand coding the computation. Signed-off-by: Ankur Arora --- Hi Andrew Could you fixup patch-7 "mm: folio_zero_user: clear page ranges" with this patch? Thanks Ankur --- include/linux/mm.h | 2 +- mm/memory.c | 20 ++++++++++---------- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index c1ff832c33b5..e8bb09816fbf 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4238,7 +4238,7 @@ static inline void clear_pages(void *addr, unsigned int npages) * (See comment above clear_pages() for why preemption latency is a concern * here.) */ -#define PROCESS_PAGES_NON_PREEMPT_BATCH (32 << (20 - PAGE_SHIFT)) +#define PROCESS_PAGES_NON_PREEMPT_BATCH (SZ_32M >> PAGE_SHIFT) #else /* !clear_pages */ /* * The architecture does not provide a clear_pages() implementation. Assume diff --git a/mm/memory.c b/mm/memory.c index 11ad1db61929..f80c67eba79f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -7240,19 +7240,19 @@ static inline int process_huge_page( static void clear_contig_highpages(struct page *page, unsigned long addr, unsigned int nr_pages) { - unsigned int i, unit, count; - - might_sleep(); + unsigned int i, count; /* - * When clearing we want to operate on the largest extent possible since - * that allows for extent based architecture specific optimizations. + * When clearing we want to operate on the largest extent possible to + * allow for architecture specific extent based optimizations. * - * However, since the clearing interfaces (clear_user_highpages(), - * clear_user_pages(), clear_pages()), do not call cond_resched(), we - * limit the batch size when running under non-preemptible scheduling - * models. + * However, since clear_user_highpages() (and primitives clear_user_pages(), + * clear_pages()), do not call cond_resched(), limit the unit size when + * running under non-preemptible scheduling models. */ - unit = preempt_model_preemptible() ? nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH; + const unsigned int unit = preempt_model_preemptible() ? + nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH; + + might_sleep(); for (i = 0; i < nr_pages; i += count) { cond_resched(); -- 2.31.1