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Re: [PATCH] xen/spinlock: use correct pointer
- To: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 26 Apr 2024 08:31:40 +0200
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 26 Apr 2024 06:31:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.04.2024 22:45, Stewart Hildebrand wrote:
> The ->profile member is at different offsets in struct rspinlock and
> struct spinlock. When initializing the profiling bits of an rspinlock,
> an unrelated member in struct rspinlock was being overwritten, leading
> to mild havoc. Use the correct pointer.
>
> Fixes: b053075d1a7b ("xen/spinlock: make struct lock_profile rspinlock_t
> aware")
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> --- a/xen/common/spinlock.c
> +++ b/xen/common/spinlock.c
> @@ -789,7 +789,11 @@ static int __init cf_check lock_prof_init(void)
> {
> (*q)->next = lock_profile_glb_q.elem_q;
> lock_profile_glb_q.elem_q = *q;
> - (*q)->ptr.lock->profile = *q;
> +
> + if ( (*q)->is_rlock )
> + (*q)->ptr.rlock->profile = *q;
> + else
> + (*q)->ptr.lock->profile = *q;
> }
>
> _lock_profile_register_struct(LOCKPROF_TYPE_GLOBAL,
Just to mention it: Strictly speaking spinlock_profile_print_elem()'s
printk("%s: addr=%p, lockval=%08x, ", data->name, data->ptr.lock, lockval);
isn't quite right either (and I would be surprised if Misra didn't have
to say something about it).
Jan
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