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Tue, 05 May 2020 06:18:15 -0700 (PDT) Subject: Re: [PATCH v2 17/20] mm: free_area_init: allow defining max_zone_pfn in descending order To: Mike Rapoport References: <20200429121126.17989-1-rppt@kernel.org> <20200429121126.17989-18-rppt@kernel.org> <20200503174138.GA114085@roeck-us.net> <20200503184300.GA154219@roeck-us.net> <20200504153901.GM14260@kernel.org> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= Message-ID: Date: Tue, 5 May 2020 06:18:11 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200504153901.GM14260@kernel.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200505_061818_268145_AE206F1C X-CRM114-Status: GOOD ( 24.88 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rich Felker , linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org, Catalin Marinas , Heiko Carstens , x86@kernel.org, Michal Hocko , "James E.J. Bottomley" , Max Filippov , Guo Ren , Ley Foon Tan , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Greg Ungerer , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Baoquan He , Jonathan Corbet , linux-hexagon@vger.kernel.org, Helge Deller , linux-sh@vger.kernel.org, Russell King , linux-csky@vger.kernel.org, Mike Rapoport , Geert Uytterhoeven , Hoan Tran , Mark Salter , Matt Turner , linux-snps-arc@lists.infradead.org, uclinux-h8-devel@lists.sourceforge.jp, linux-xtensa@linux-xtensa.org, Nick Hu , linux-alpha@vger.kernel.org, linux-um@lists.infradead.org, linux-mips@vger.kernel.org, Richard Weinberger , linux-m68k@lists.linux-m68k.org, Thomas Bogendoerfer , Qian Cai , Greentime Hu , Paul Walmsley , Stafford Horne , Guan Xuetao , linux-arm-kernel@lists.infradead.org, Michal Simek , Tony Luck , Yoshinori Sato , linux-parisc@vger.kernel.org, linux-mm@kvack.org, Vineet Gupta , Brian Cain , linux-kernel@vger.kernel.org, openrisc@lists.librecores.org, Michael Ellerman , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On 5/4/20 8:39 AM, Mike Rapoport wrote: > On Sun, May 03, 2020 at 11:43:00AM -0700, Guenter Roeck wrote: >> On Sun, May 03, 2020 at 10:41:38AM -0700, Guenter Roeck wrote: >>> Hi, >>> >>> On Wed, Apr 29, 2020 at 03:11:23PM +0300, Mike Rapoport wrote: >>>> From: Mike Rapoport >>>> >>>> Some architectures (e.g. ARC) have the ZONE_HIGHMEM zone below the >>>> ZONE_NORMAL. Allowing free_area_init() parse max_zone_pfn array even it is >>>> sorted in descending order allows using free_area_init() on such >>>> architectures. >>>> >>>> Add top -> down traversal of max_zone_pfn array in free_area_init() and use >>>> the latter in ARC node/zone initialization. >>>> >>>> Signed-off-by: Mike Rapoport >>> >>> This patch causes my microblazeel qemu boot test in linux-next to fail. >>> Reverting it fixes the problem. >>> >> The same problem is seen with s390 emulations. > > Yeah, this patch breaks some others as well :( > > My assumption that max_zone_pfn defines architectural limit for maximal > PFN that can belong to a zone was over-optimistic. Several arches > actually do that, but others do > > max_zone_pfn[ZONE_DMA] = MAX_DMA_PFN; > max_zone_pfn[ZONE_NORMAL] = max_pfn; > > where MAX_DMA_PFN is build-time constrain and max_pfn is run time limit > for the current system. > > So, when max_pfn is lower than MAX_DMA_PFN, the free_init_area() will > consider max_zone_pfn as descending and will wrongly calculate zone > extents. > > That said, instead of trying to create a generic way to special case > ARC, I suggest to simply use the below patch instead. > As a reminder, I reported the problem against s390 and microblazeel (interestingly enough, microblaze (big endian) works), not against arc. Guenter > diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c > index 41eb9be1653c..386959bac3d2 100644 > --- a/arch/arc/mm/init.c > +++ b/arch/arc/mm/init.c > @@ -77,6 +77,11 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size) > base, TO_MB(size), !in_use ? "Not used":""); > } > > +bool arch_has_descending_max_zone_pfns(void) > +{ > + return true; > +} > + > /* > * First memory setup routine called from setup_arch() > * 1. setup swapper's mm @init_mm > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index b990e9734474..114f0e027144 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -7307,6 +7307,15 @@ static void check_for_memory(pg_data_t *pgdat, int nid) > } > } > > +/* > + * Some architecturs, e.g. ARC may have ZONE_HIGHMEM below ZONE_NORMAL. For > + * such cases we allow max_zone_pfn sorted in the descending order > + */ > +bool __weak arch_has_descending_max_zone_pfns(void) > +{ > + return false; > +} > + > /** > * free_area_init - Initialise all pg_data_t and zone data > * @max_zone_pfn: an array of max PFNs for each zone > @@ -7324,7 +7333,7 @@ void __init free_area_init(unsigned long *max_zone_pfn) > { > unsigned long start_pfn, end_pfn; > int i, nid, zone; > - bool descending = false; > + bool descending; > > /* Record where the zone boundaries are */ > memset(arch_zone_lowest_possible_pfn, 0, > @@ -7333,14 +7342,7 @@ void __init free_area_init(unsigned long *max_zone_pfn) > sizeof(arch_zone_highest_possible_pfn)); > > start_pfn = find_min_pfn_with_active_regions(); > - > - /* > - * Some architecturs, e.g. ARC may have ZONE_HIGHMEM below > - * ZONE_NORMAL. For such cases we allow max_zone_pfn sorted in the > - * descending order > - */ > - if (MAX_NR_ZONES > 1 && max_zone_pfn[0] > max_zone_pfn[1]) > - descending = true; > + descending = arch_has_descending_max_zone_pfns(); > > for (i = 0; i < MAX_NR_ZONES; i++) { > if (descending) > >> Guenter >> >>> qemu command line: >>> >>> qemu-system-microblazeel -M petalogix-ml605 -m 256 \ >>> -kernel arch/microblaze/boot/linux.bin -no-reboot \ >>> -initrd rootfs.cpio \ >>> -append 'panic=-1 slub_debug=FZPUA rdinit=/sbin/init console=ttyS0,115200' \ >>> -monitor none -serial stdio -nographic >>> >>> initrd: >>> https://github.com/groeck/linux-build-test/blob/master/rootfs/microblazeel/rootfs.cpio.gz >>> configuration: >>> https://github.com/groeck/linux-build-test/blob/master/rootfs/microblazeel/qemu_microblazeel_ml605_defconfig >>> >>> Bisect log is below. >>> >>> Guenter >>> >>> --- >>> # bad: [fb9d670f57e3f6478602328bbbf71138be06ca4f] Add linux-next specific files for 20200501 >>> # good: [6a8b55ed4056ea5559ebe4f6a4b247f627870d4c] Linux 5.7-rc3 >>> git bisect start 'HEAD' 'v5.7-rc3' >>> # good: [068b80b68a670f0b17288c8a3d1ee751f35162ab] Merge remote-tracking branch 'drm/drm-next' >>> git bisect good 068b80b68a670f0b17288c8a3d1ee751f35162ab >>> # good: [46c70fc6a3ac35cd72ddad248dcbe4eee716d2a5] Merge remote-tracking branch 'drivers-x86/for-next' >>> git bisect good 46c70fc6a3ac35cd72ddad248dcbe4eee716d2a5 >>> # good: [f39c4ad479a2f005f972a2b941b40efa6b9c9349] Merge remote-tracking branch 'rpmsg/for-next' >>> git bisect good f39c4ad479a2f005f972a2b941b40efa6b9c9349 >>> # bad: [165d3ee0162fe28efc2c8180176633e33515df15] ipc-convert-ipcs_idr-to-xarray-update >>> git bisect bad 165d3ee0162fe28efc2c8180176633e33515df15 >>> # good: [001f1d211ed2ed0f005838dc4390993930bbbd69] mm: remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES >>> git bisect good 001f1d211ed2ed0f005838dc4390993930bbbd69 >>> # bad: [aaad7401bd32f10c1d591dd886b3a9b9595c6d77] mm/vmsan: fix some typos in comment >>> git bisect bad aaad7401bd32f10c1d591dd886b3a9b9595c6d77 >>> # bad: [09f9d0ab1fbed85623b283995aa7a7d78daa1611] khugepaged: allow to collapse PTE-mapped compound pages >>> git bisect bad 09f9d0ab1fbed85623b283995aa7a7d78daa1611 >>> # bad: [c942fc8a3e5088407bc32d94f554bab205175f8a] mm/vmstat.c: do not show lowmem reserve protection information of empty zone >>> git bisect bad c942fc8a3e5088407bc32d94f554bab205175f8a >>> # bad: [b29358d269ace3826d8521bea842fc2984cfc11b] mm/page_alloc.c: rename free_pages_check() to check_free_page() >>> git bisect bad b29358d269ace3826d8521bea842fc2984cfc11b >>> # bad: [be0fb591a1f1df20a00c8f023f9ca4891f177b0d] mm: simplify find_min_pfn_with_active_regions() >>> git bisect bad be0fb591a1f1df20a00c8f023f9ca4891f177b0d >>> # bad: [c17422a008d36dcf3e9f51469758c5762716cb0a] mm: rename free_area_init_node() to free_area_init_memoryless_node() >>> git bisect bad c17422a008d36dcf3e9f51469758c5762716cb0a >>> # bad: [51a2f644fd020d5f090044825c388444d11029d5] mm: free_area_init: allow defining max_zone_pfn in descending order >>> git bisect bad 51a2f644fd020d5f090044825c388444d11029d5 >>> # first bad commit: [51a2f644fd020d5f090044825c388444d11029d5] mm: free_area_init: allow defining max_zone_pfn in descending order > _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc