From: Paul E. McKenney Date: Wed, 4 Jun 2025 19:42:14 +0000 (-0700) Subject: rcutorture: Make rcutorture_one_extend_check() account for hard IRQs X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eec1f94cf77f8a7f7078365f5029a56b0ce16580;p=thirdparty%2Flinux.git rcutorture: Make rcutorture_one_extend_check() account for hard IRQs This commit retrospectively prepares for testing of RCU readers invoked from hardware interrupt handlers (for example, HRTIMER_MODE_HARD hrtimer handlers) in kernels built with CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=y, which is rarely used but sometimes extremely useful. This preparation involves taking early exits if in_hardirq(), and, while we are in the area, a very early exit if in_nmi(). This means that a number of insoftirq parameters are no longer needed, but that is the subject of a later commit. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202505140917.8ee62cc6-lkp@intel.com Signed-off-by: Paul E. McKenney Tested-by: kernel test robot Signed-off-by: Neeraj Upadhyay (AMD) --- diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index a209d2419cfdb..7944cc69321df 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1920,10 +1920,10 @@ static void rcutorture_one_extend_check(char *s, int curstate, int new, int old, { int mask; - if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE)) + if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE) || in_nmi()) return; - WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled(), ROEC_ARGS); + WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled() && !in_hardirq(), ROEC_ARGS); WARN_ONCE((curstate & RCUTORTURE_RDR_IRQ) && !irqs_disabled(), ROEC_ARGS); // If CONFIG_PREEMPT_COUNT=n, further checks are unreliable. @@ -1938,9 +1938,9 @@ static void rcutorture_one_extend_check(char *s, int curstate, int new, int old, (curstate & (RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2)) && cur_ops->readlock_nesting() == 0, ROEC_ARGS); - // Timer handlers have all sorts of stuff disabled, so ignore + // Interrupt handlers have all sorts of stuff disabled, so ignore // unintended disabling. - if (insoftirq) + if (in_serving_softirq() || in_hardirq()) return; WARN_ONCE(cur_ops->extendables &&