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Message-Id: <20070420121543.6a1a8426.akpm@linux-foundation.org> Date: Fri, 20 Apr 2007 12:15:43 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Balbir Singh <balbir@...ibm.com> Cc: nagar@...son.ibm.com, jlan@....com, linux-kernel@...r.kernel.org Subject: Re: [PATCH -mm] Taskstats fix the structure members alignment issue On Fri, 20 Apr 2007 22:13:41 +0530 Balbir Singh <balbir@...ibm.com> wrote: > > We broke the the alignment of members of taskstats to the 8 byte boundary > with the CSA patches. In the current kernel, the taskstats structure is > not suitable for use by 32 bit applications in a 64 bit kernel. > ugh, that was bad of us. > ... > The patch adds an __attribute__((aligned(8))) to the > taskstats structure members so that 32 bit applications using taskstats > can work with a 64 bit kernel. But there might be 32-bit applications out there which are using the present wrong structure? otoh, I assume that those applications would be using taskstats.h and would hence encounter this bug and we would have heard about it, is that correct? otoh^2, 32-bit applications running under 32-bit kernels will presently be functioning correctly, and your change will require that those applications be recompiled, I think? This patch looks like 2.6.20 and 2.6.21 material, but very carefully... - 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/
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