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Message-Id: <20250509141727.19b616d1c4a549d01656e5dd@linux-foundation.org> Date: Fri, 9 May 2025 14:17:27 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Boian Bonev <bbonev@...uan.org> Cc: linux-kernel@...r.kernel.org, Balbir Singh <bsingharora@...il.com>, Yang Yang <yang.yang29@....com.cn>, Wang Yaxin <wang.yaxin@....com.cn>, Kun Jiang <jiang.kun2@....com.cn>, xu xin <xu.xin16@....com.cn> Subject: Re: Bug 220102 - struct taskstats breaks backward compatibility since version 15 On Fri, 09 May 2025 21:35:59 +0300 Boian Bonev <bbonev@...uan.org> wrote: > Hello! > > Since version 15 (TASKSTATS_VERSION=15) the new layout of the structure > adds fields in the middle of the structure, rendering all old software > incompatible with newer kernels and software compiled against the new > kernel headers incompatible with older kernels. Yikes. Yes, we did change the versioning but such an incompatibility seems undesirable and unnecessarily disruptive. > I think that change has to be reverted and the added fields moved to > the end of the structure. Also bumping the version to 16 after the > change is a good idea in order for the userspace software to be able to > distinguish the different formats. Yes, please send along the patch. Include the suitable Fixes: and we can backport this into the affected -stable kernels. > https://bugzilla.kernel.org/show_bug.cgi?id=220102
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