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Until then, all > watermarks are set to zero. This causes cond_accept_memory() to > incorrectly skip memory acceptance because a watermark of 0 is always > met. > > To ensure progress, accept one MAX_ORDER page if the watermark is zero. > > Signed-off-by: Kirill A. Shutemov > Reported-and-tested-by: Farrah Chen Reviewed-by: Pankaj Gupta Also, did a basic boot test of SNP guest kernel 6.14-rc6 with the patch applied on top. > --- > mm/page_alloc.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 579789600a3c..4fe93029bcb6 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -7004,7 +7004,7 @@ static inline bool has_unaccepted_memory(void) > > static bool cond_accept_memory(struct zone *zone, unsigned int order) > { > - long to_accept; > + long to_accept, wmark; > bool ret = false; > > if (!has_unaccepted_memory()) > @@ -7013,8 +7013,18 @@ static bool cond_accept_memory(struct zone *zone, unsigned int order) > if (list_empty(&zone->unaccepted_pages)) > return false; > > + wmark = promo_wmark_pages(zone); > + > + /* > + * Watermarks have not been initialized yet. > + * > + * Accepting one MAX_ORDER page to ensure progress. > + */ > + if (!wmark) > + return try_to_accept_memory_one(zone); > + > /* How much to accept to get to promo watermark? */ > - to_accept = promo_wmark_pages(zone) - > + to_accept = wmark - > (zone_page_state(zone, NR_FREE_PAGES) - > __zone_watermark_unusable_free(zone, order, 0) - > zone_page_state(zone, NR_UNACCEPTED));