From cc489539ca4480363e75c1f71bf9e47f835fb2ef Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 26 Feb 2021 17:26:04 +0100 Subject: [PATCH 109/191] mm: slub: Don't resize the location tracking cache on PREEMPT_RT The location tracking cache has a size of a page and is resized if its current size is too small. This allocation happens with disabled interrupts and can't happen on PREEMPT_RT. Should one page be too small, then we have to allocate more at the beginning. The only downside is that less callers will be visible. Signed-off-by: Sebastian Andrzej Siewior --- mm/slub.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index ec608c1d5fdb..26cf2872a7ff 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4819,6 +4819,9 @@ static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) struct location *l; int order; + if (IS_ENABLED(CONFIG_PREEMPT_RT) && flags == GFP_ATOMIC) + return 0; + order = get_order(sizeof(struct location) * max); l = (void *)__get_free_pages(flags, order); -- 2.19.1