From 495163420ab5398c84af96ca3eae2c6aa4a140da Mon Sep 17 00:00:00 2001 From: Juri Lelli Date: Tue, 11 Feb 2014 09:24:27 +0100 Subject: [PATCH] sched/core: Make dl_b->lock IRQ safe Fix this lockdep warning: [ 44.804600] ========================================================= [ 44.805746] [ INFO: possible irq lock inversion dependency detected ] [ 44.805746] 3.14.0-rc2-test+ #14 Not tainted [ 44.805746] --------------------------------------------------------- [ 44.805746] bash/3674 just changed the state of lock: [ 44.805746] (&dl_b->lock){+.....}, at: [] sched_rt_handler+0x132/0x248 [ 44.805746] but this lock was taken by another, HARDIRQ-safe lock in the past: [ 44.805746] (&rq->lock){-.-.-.} and interrupts could create inverse lock ordering between them. [ 44.805746] [ 44.805746] other info that might help us debug this: [ 44.805746] Possible interrupt unsafe locking scenario: [ 44.805746] [ 44.805746] CPU0 CPU1 [ 44.805746] ---- ---- [ 44.805746] lock(&dl_b->lock); [ 44.805746] local_irq_disable(); [ 44.805746] lock(&rq->lock); [ 44.805746] lock(&dl_b->lock); [ 44.805746] [ 44.805746] lock(&rq->lock); by making dl_b->lock acquiring always IRQ safe. Cc: Ingo Molnar Signed-off-by: Juri Lelli Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1392107067-19907-3-git-send-email-juri.lelli@gmail.com Signed-off-by: Thomas Gleixner --- Reading git-format-patch failed