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xen/time: Don't leak interrupt name when offlining.
When the user does: echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online kmemleak reports: kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak) One of the leaks is from xen/time: unreferenced object 0xffff88003fa51280 (size 32): comm "swapper/0", pid 1, jiffies 4294667339 (age 1027.789s) hex dump (first 32 bytes): 74 69 6d 65 72 31 00 00 00 00 00 00 00 00 00 00 timer1.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff81660721>] kmemleak_alloc+0x21/0x50 [<ffffffff81190aac>] __kmalloc_track_caller+0xec/0x2a0 [<ffffffff812fe1bb>] kvasprintf+0x5b/0x90 [<ffffffff812fe228>] kasprintf+0x38/0x40 [<ffffffff81041ec1>] xen_setup_timer+0x51/0xf0 [<ffffffff8166339f>] xen_cpu_up+0x5f/0x3e8 [<ffffffff8166bbf5>] _cpu_up+0xd1/0x14b [<ffffffff8166bd48>] cpu_up+0xd9/0xec [<ffffffff81ae6e4a>] smp_init+0x4b/0xa3 [<ffffffff81ac4981>] kernel_init_freeable+0xdb/0x1e6 [<ffffffff8165ce39>] kernel_init+0x9/0xf0 [<ffffffff8167edfc>] ret_from_fork+0x7c/0xb0 [<ffffffffffffffff>] 0xffffffffffffffff This patch fixes it by stashing away the 'name' in the per-cpu data structure and freeing it when offlining the CPU. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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1 changed files with 5 additions and 1 deletions
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@ -14,6 +14,7 @@
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#include <linux/kernel_stat.h>
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#include <linux/math64.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <asm/pvclock.h>
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#include <asm/xen/hypervisor.h>
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@ -402,7 +403,7 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
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void xen_setup_timer(int cpu)
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{
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const char *name;
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char *name;
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struct clock_event_device *evt;
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int irq;
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@ -425,6 +426,7 @@ void xen_setup_timer(int cpu)
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evt->cpumask = cpumask_of(cpu);
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evt->irq = irq;
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per_cpu(xen_clock_events, cpu).name = name;
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}
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void xen_teardown_timer(int cpu)
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@ -434,6 +436,8 @@ void xen_teardown_timer(int cpu)
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evt = &per_cpu(xen_clock_events, cpu).evt;
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unbind_from_irqhandler(evt->irq, NULL);
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evt->irq = -1;
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kfree(per_cpu(xen_clock_events, cpu).name);
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per_cpu(xen_clock_events, cpu).name = NULL;
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}
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void xen_setup_cpu_clockevents(void)
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