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smpboot: use kmemleak_not_leak for smpboot_thread_data 

Kmemleak reports the following memory leak :

    [<ffffffc0002faef8>] create_object+0x140/0x274
    [<ffffffc000cc3598>] kmemleak_alloc+0x80/0xbc
    [<ffffffc0002f707c>] kmem_cache_alloc_trace+0x148/0x1d8
    [<ffffffc00024504c>] __smpboot_create_thread.part.2+0x2c/0xec
    [<ffffffc0002452b4>] smpboot_register_percpu_thread+0x90/0x118
    [<ffffffc0016067c0>] spawn_ksoftirqd+0x1c/0x30
    [<ffffffc000200824>] do_one_initcall+0xb0/0x14c
    [<ffffffc001600820>] kernel_init_freeable+0x84/0x1e0
    [<ffffffc000cc273c>] kernel_init+0x10/0xcc
    [<ffffffc000203bbc>] ret_from_fork+0xc/0x50

This memory allocated here points to smpboot_thread_data.
Data is used as an argument for this kthread.

This will be used when smpboot_thread_fn runs. Therefore,
is not a leak.

Call kmemleak_not_leak for smpboot_thread_data pointer
to ensure that kmemleak doesn't report it as a memory
leak.

Change-Id: I02b0a7debea3907b606856e069d63d7991b67cd9
Signed-off-by: Vignesh Radhakrishnan <vigneshr@codeaurora.org>
This commit is contained in:
Vignesh Radhakrishnan 2015-05-11 16:41:54 +05:30
parent 401b12a383
commit e7061e1871
1 changed files with 3 additions and 0 deletions
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3
kernel/smpboot.c
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@ -12,6 +12,7 @@
#include <linux/percpu.h>
#include <linux/kthread.h>
#include <linux/smpboot.h>
#include <linux/kmemleak.h>
#include "smpboot.h"
@ -174,6 +175,8 @@ __smpboot_create_thread(struct smp_hotplug_thread *ht, unsigned int cpu)
td = kzalloc_node(sizeof(*td), GFP_KERNEL, cpu_to_node(cpu));
if (!td)
return -ENOMEM;
kmemleak_not_leak(td);
td->cpu = cpu;
td->ht = ht;