On 02/06, Sasha Levin wrote:
>
> Can we modify it slightly to avoid potentially accessing invalid memory:
>
> diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
> index 5315887..cd22d73 100644
> --- a/arch/x86/include/asm/spinlock.h
> +++ b/arch/x86/include/asm/spinlock
On 02/06/2015 09:55 PM, Linus Torvalds wrote:
On Fri, Feb 6, 2015 at 6:49 AM, Raghavendra K T
wrote:
Paravirt spinlock clears slowpath flag after doing unlock.
[ fix edited out ]
So I'm not going to be applying this for 3.19, because it's much too
late and the patch is too scary. Plus the bug
On 02/07/2015 12:27 AM, Sasha Levin wrote:
On 02/06/2015 09:49 AM, Raghavendra K T wrote:
Paravirt spinlock clears slowpath flag after doing unlock.
As explained by Linus currently it does:
prev = *lock;
add_smp(&lock->tickets.head, TICKET_LOCK_INC);
On 02/06/2015 06:49 AM, Raghavendra K T wrote:
> Paravirt spinlock clears slowpath flag after doing unlock.
> As explained by Linus currently it does:
> prev = *lock;
> add_smp(&lock->tickets.head, TICKET_LOCK_INC);
>
> /* add_smp() is a full mb() */
Tetsuo Handa writes:
>>From 11fd997d724f520ca628615e7ffbfd7901c40b62 Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa
> Date: Fri, 6 Feb 2015 13:28:38 +0900
> Subject: [PATCH] virtio: Avoid possible kernel panic if DEBUG is enabled.
>
> The virtqueue_add() calls START_USE() upon entry. The virtqueu
