From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by gnuweeb.org (Postfix) with ESMTPS id B16997E351 for ; Thu, 31 Mar 2022 16:59:22 +0000 (UTC) Authentication-Results: gnuweeb.org; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Bk7hlmTl; dkim-atps=neutral Content-Type: text/plain; charset=utf-8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1648745960; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bhGsRCUFCEYULPL/omreK/3n0ZicJpzKa59O2/FBKhU=; b=Bk7hlmTlyQb1whvg1ngnlc1ZCMtSU8R4ZbIEDeeyxkBqnvXEGMRr+jU3RzyehyCKyCP5p4 HjOACtAyBR3kYT0mJ2V4MSYbwItBz59DeW0Xr+gMO3kR9ZQ6BJcFDibO8PcaSzViOR/yN/ 6wbI0RsWvjbrsD0EeoOo+FbxUENmGYs= Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10 4036/5872] WARNING: modpost: vmlinux.o(.text+0x4111c4): Section mismatch in reference from the function memblock_bottom_up() to the variable .meminit.data:memblock X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Roman Gushchin In-Reply-To: Date: Thu, 31 Mar 2022 09:59:17 -0700 Cc: Mike Rapoport , kernel test robot , Roman Gushchin , llvm@lists.linux.dev, kbuild-all@lists.01.org, GNU/Weeb Mailing List , linux-kernel@vger.kernel.org, Suren Baghdasaryan , Andrew Morton , Linux Memory Management List , Minchan Kim , Nick Desaulniers Message-Id: <7A4F3379-CC71-4F44-94C0-E47115C14917@linux.dev> References: To: Nathan Chancellor X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev List-Id: > On Mar 31, 2022, at 9:11 AM, Nathan Chancellor wrote: >=20 > =EF=BB=BFOn Thu, Mar 31, 2022 at 12:42:04PM +0300, Mike Rapoport wrote: >> (added llvm folks) >>=20 >> Hi, >>=20 >>> On Wed, Mar 30, 2022 at 02:47:43PM -0700, Roman Gushchin wrote: >>> On Wed, Mar 30, 2022 at 02:53:14PM +0800, kbuild test robot wrote: >>>> Hi Roman, >>>>=20 >>>> FYI, the error/warning still remains. >>>>=20 >>>> tree: https://github.com/ammarfaizi2/linux-block google/android/kerne= l/common/android12-trusty-5.10 >>>> head: 07055bfd3d810d41a38354693dfaa55a6f8c0025 >>>> commit: 0e0bfc41fdf4d79d39ebe929844cdee44f97366d [4036/5872] UPSTREAM: m= m: cma: allocate cma areas bottom-up >>>> config: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive= /20220330/202203301412.MZ7wQvQz-lkp@intel.com/config) >>>> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f= 6d9501cf49ce02937099350d08f20c4af86f3d) >>>> reproduce (this is a W=3D1 build): >>>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sb= in/make.cross -O ~/bin/make.cross >>>> chmod +x ~/bin/make.cross >>>> # https://github.com/ammarfaizi2/linux-block/commit/0e0bfc41fdf4= d79d39ebe929844cdee44f97366d >>>> git remote add ammarfaizi2-block https://github.com/ammarfaizi2/= linux-block >>>> git fetch --no-tags ammarfaizi2-block google/android/kernel/comm= on/android12-trusty-5.10 >>>> git checkout 0e0bfc41fdf4d79d39ebe929844cdee44f97366d >>>> # save the config file to linux build tree >>>> mkdir build_dir >>>> COMPILER_INSTALL_PATH=3D$HOME/0day COMPILER=3Dclang make.cross W= =3D1 O=3Dbuild_dir ARCH=3Dx86_64 SHELL=3D/bin/bash >>>>=20 >>>> If you fix the issue, kindly add following tag as appropriate >>>> Reported-by: kernel test robot >>>>=20 >>>> All warnings (new ones prefixed by >>, old ones prefixed by <<): >>>>=20 >>>>>> WARNING: modpost: vmlinux.o(.text+0x4111c4): Section mismatch in refe= rence from the function memblock_bottom_up() to the variable .meminit.data:m= emblock >>>> The function memblock_bottom_up() references >>>> the variable __meminitdata memblock. >>>> This is often because memblock_bottom_up lacks a __meminitdata >>>> annotation or the annotation of memblock is wrong. >>>=20 >>> I guess this patch should fix it, however I fail to reproduce the origin= al issue. >>> Maybe it's up to the specific compiler version. >>>=20 >>> -- >>>=20 >>> =46rom b55a8dd19f4156d7e24ec39b18ede06965ce1c4f Mon Sep 17 00:00:00 2001= >>> From: Roman Gushchin >>> Date: Wed, 30 Mar 2022 14:42:12 -0700 >>> Subject: [PATCH] memblock: fix memblock_bottom_up() and >>> memblock_set_bottom_up() annotations >>>=20 >>> memblock_bottom_up() and memblock_set_bottom_up() lack __meminitdata >>> annotations causing compiler warnings like: >>> WARNING: modpost: vmlinux.o(.text+0x4111c4): Section mismatch in refere= nce from the function memblock_bottom_up() to the >>> variable .meminit.data:memblock >>>=20 >>> Fix it by adding the missing annotation and removing the wrong >>> __meminit annotation. >>>=20 >>> Reported-by: kernel test robot >>> Signed-off-by: Roman Gushchin >>> --- >>> include/linux/memblock.h | 4 ++-- >>> 1 file changed, 2 insertions(+), 2 deletions(-) >>>=20 >>> diff --git a/include/linux/memblock.h b/include/linux/memblock.h >>> index 50ad19662a32..536bc2fc31e6 100644 >>> --- a/include/linux/memblock.h >>> +++ b/include/linux/memblock.h >>> @@ -460,7 +460,7 @@ static inline void *memblock_alloc_node(phys_addr_t s= ize, >>> /* >>> * Set the allocation direction to bottom-up or top-down. >>> */ >>> -static inline __init_memblock void memblock_set_bottom_up(bool enable) >>> +static inline __initdata_memblock void memblock_set_bottom_up(bool enab= le) >>=20 >> I think putting __initdata_memlock won't help here, because there should b= e >> nothing wrong with __meminit function accessing __meminitdata data. >>=20 >> My guesstimate would be that the compiler decided not to inline this and >> still dropped section attribute because of 'inline'. >>=20 >> If this is the case we I think we should=20 >>=20 >> s/inline __init_memblock/__always_inline/ >>=20 >>> { >>> memblock.bottom_up =3D enable; >>> } >>> @@ -470,7 +470,7 @@ static inline __init_memblock void memblock_set_bott= om_up(bool enable) >>> * if this is true, that said, memblock will allocate memory >>> * in bottom-up direction. >>> */ >>> -static inline __init_memblock bool memblock_bottom_up(void) >>> +static inline __initdata_memblock bool memblock_bottom_up(void) >>> { >>> return memblock.bottom_up; >>> } >>> --=20 >>> 2.30.2 >>>=20 >>=20 >=20 > For the record, I cannot reproduce this on mainline, which has commits > 34dc2efb39a2 ("memblock: fix section mismatch warning") and a024b7c2850d > ("mm: memblock: fix section mismatch warning again"). That first commit > has the same exact warning as this report, which is against an Android > tree (android12-trusty-5.10). >=20 > While I do not see the commit that 34dc2efb39a2 claims to fix in > android12-trusty-5.10, I do see the three commits in android12-5.10: >=20 > a46e3fa13968 ("UPSTREAM: mm: memblock: drop __init from memblock functions= to make it inline") > 5f7ec0f4c383 ("UPSTREAM: memblock: fix section mismatch warning") > 8cf5bb6946a2 ("UPSTREAM: mm: memblock: fix section mismatch warning again"= ) >=20 > I think we can just discard this report for now, unless someone from > Google's trusty team wants to address it in that branch. I agree. Or at least help us with the testing of the proposed fixes. Thanks!=