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SubjectRe: [PATCH V2] megaraid: kmemleak: Track page allocation for fusion
On Fri, Sep 15, 2017 at 01:21:52PM +0800, shuwang@redhat.com wrote:
> From: Shu Wang <shuwang@redhat.com>
>
> Kmemleak reports about a thousand false positives for fusion->
> cmd_list[]. Root casue is the cmd_list objects are allocated from
> slab allocator, and stored its pointer in object allocated by page
> allocator. The fix will tell kmemleak to track and scan fusion
> object.
>
> V2:
> Add comment, balance braces, move kmemleak_free before free_pages.
> checkpatch passed.
>
> Before patch:
> kmemleak: 1004 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
>
> unreferenced object 0xffff88042584e000 (size 8192):
> backtrace:
> kmemleak_alloc+0x4a/0xa0
> __kmalloc+0xec/0x220
> megasas_alloc_cmdlist_fusion+0x3e/0x140 [megaraid_sas]
> megasas_alloc_cmds_fusion+0x44/0x450 [megaraid_sas]
> megasas_init_adapter_fusion+0x21d/0x6e0 [megaraid_sas]
> megasas_init_fw+0x357/0xd30 [megaraid_sas]
> megasas_probe_one.part.34+0x5be/0x1040 [megaraid_sas]
> megasas_probe_one+0x46/0xc0 [megaraid_sas]
> local_pci_probe+0x45/0xa0
> work_for_cpu_fn+0x14/0x20
> process_one_work+0x149/0x360
> worker_thread+0x1d8/0x3c0
> kthread+0x109/0x140
> ret_from_fork+0x25/0x30
>
> Signed-off-by: Shu Wang <shuwang@redhat.com>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

Thanks.

--
Catalin

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