From 2cffad7bad83157f89332872015f4305d2ac09ac Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 13 Sep 2017 23:29:53 +0200 Subject: x86/irq: Simplify hotplug vector accounting Before a CPU is taken offline the number of active interrupt vectors on the outgoing CPU and the number of vectors which are available on the other online CPUs are counted and compared. If the active vectors are more than the available vectors on the other CPUs then the CPU hot-unplug operation is aborted. This again uses loop based search and is inaccurate. The bitmap matrix allocator has accurate accounting information and can tell exactly whether the vector space is sufficient or not. Emit a message when the number of globaly reserved (unallocated) vectors is larger than the number of available vectors after offlining a CPU because after that point request_irq() might fail. Signed-off-by: Thomas Gleixner Tested-by: Juergen Gross Tested-by: Yu Chen Acked-by: Juergen Gross Cc: Boris Ostrovsky Cc: Tony Luck Cc: Marc Zyngier Cc: Alok Kataria Cc: Joerg Roedel Cc: "Rafael J. Wysocki" Cc: Steven Rostedt Cc: Christoph Hellwig Cc: Peter Zijlstra Cc: Borislav Petkov Cc: Paolo Bonzini Cc: Rui Zhang Cc: "K. Y. Srinivasan" Cc: Arjan van de Ven Cc: Dan Williams Cc: Len Brown Link: https://lkml.kernel.org/r/20170913213156.351193962@linutronix.de --- arch/x86/kernel/smpboot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kernel/smpboot.c') diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 86739f04701b..92aadfa30d61 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1525,7 +1525,7 @@ int native_cpu_disable(void) { int ret; - ret = check_irq_vectors_for_cpu_disable(); + ret = lapic_can_unplug_cpu(); if (ret) return ret; -- cgit