linux-kernel - Re: [PATH -mm] Fix a race condtion of oops_in

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1219124280.5663.88.camel@yhuang-dev.sh.intel.com>
Date:	Tue, 19 Aug 2008 13:38:00 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATH -mm] Fix a race condtion of oops_in_progress

On Mon, 2008-08-18 at 21:06 -0700, Andrew Morton wrote:
> On Mon, 18 Aug 2008 10:03:27 +0800 Huang Ying <ying.huang@...el.com> wrote:
> 
> > This patch fix a race condition of oops_in_progress. Which may be
> > changed on multiple CPU simultaneously, but it is changed via
> > non-atomic operation ++/--. This patch changes the definition of
> > oops_in_process from int to atomic_t, and accessing method to atomic
> > operations.
> 
> 
> > extern atomic_t oops_in_progress;
> 
> In file included from include/asm/system.h:10,
>                  from include/asm/processor.h:17,
>                  from include/asm/atomic_32.h:5,
>                  from include/asm/atomic.h:2,
>                  from include/linux/crypto.h:20,
>                  from arch/x86/kernel/asm-offsets_32.c:7,
>                  from arch/x86/kernel/asm-offsets.c:2:
> include/linux/kernel.h:236: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'oops_in_progress'
> make[1]: *** [arch/x86/kernel/asm-offsets.s] Error 1
> make: *** [prepare0] Error 2
> 
> we can't inlude asm/atomic.h from linux/kernel.h because asm/atomic.h
> includes linux/kernel.h via the above route.
> 
> And we cannot forward-declare atomic_t by hand because it's a typedef.
> 
> Not sure what to do, really.  Find a different header file in which to
> declare oops_in_progress?

It seems that asm/atomic.h is used for both atomic_t declaration and
implementation, how about separate them? That it, add a new file
asm/atomic_def.h, put typedef there, and include asm/atomic_def.h in
kernel.h?

Best Regards,
Huang Ying


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/