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2020-06-04powerpc: add support for folded p4d page tablesMike Rapoport1-7/+8
Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h. [rppt@linux.ibm.com: powerpc/xmon: drop unused pgdir varialble in show_pte() function] Link: http://lkml.kernel.org/r/20200519181454.GI1059226@linux.ibm.com [rppt@linux.ibm.com; build fix] Link: http://lkml.kernel.org/r/20200423141845.GI13521@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # 8xx and 83xx Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: James Morse <james.morse@arm.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Julien Thierry <julien.thierry.kdev@gmail.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200414153455.21744-9-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-05-28powerpc/40x: Rework 40x PTE access and TLB missChristophe Leroy1-2/+2
Commit 1bc54c03117b ("powerpc: rework 4xx PTE access and TLB miss") reworked 44x PTE access to avoid atomic pte updates, and left 8xx, 40x and fsl booke with atomic pte updates. Commit 6cfd8990e27d ("powerpc: rework FSL Book-E PTE access and TLB miss") removed atomic pte updates on fsl booke. It went away on 8xx with commit ddfc20a3b9ae ("powerpc/8xx: Remove PTE_ATOMIC_UPDATES"). 40x is the last platform setting PTE_ATOMIC_UPDATES. Rework PTE access and TLB miss to remove PTE_ATOMIC_UPDATES for 40x: - Always handle DSI as a fault. - Bail out of TLB miss handler when CONFIG_SWAP is set and _PAGE_ACCESSED is not set. - Bail out of ITLB miss handler when _PAGE_EXEC is not set. - Only set WR bit when both _PAGE_RW and _PAGE_DIRTY are set. - Remove _PAGE_HWWRITE - Don't require PTE_ATOMIC_UPDATES anymore Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/99a0fcd337ef67088140d1647d75fea026a70413.1590079968.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Allow large TLBs with DEBUG_PAGEALLOCChristophe Leroy1-3/+8
DEBUG_PAGEALLOC only manages RW data. Text and RO data can still be mapped with hugepages and pinned TLB. In order to map with hugepages, also enforce a 512kB data alignment minimum. That's a trade-off between size of speed, taking into account that DEBUG_PAGEALLOC is a debug option. Anyway the alignment is still tunable. We also allow tuning of alignment for book3s to limit the complexity of the test in Kconfig that will anyway disappear in the following patches once DEBUG_PAGEALLOC is handled together with BATs. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c13256f2d356a316715da61fe089b3623ef217a5.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Allow STRICT_KERNEL_RwX with pinned TLBChristophe Leroy1-2/+7
Pinned TLB are 8M. Now that there is no strict boundary anymore between text and RO data, it is possible to use 8M pinned executable TLB that covers both text and RO data. When PIN_TLB_DATA or PIN_TLB_TEXT is selected, enforce 8M RW data alignment and allow STRICT_KERNEL_RWX. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c535fc97bf0dd8693192e25feeed8088701e00c6.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Map linear memory with huge pagesChristophe Leroy1-1/+49
Map linear memory space with 512k and 8M pages whenever possible. Three mappings are performed: - One for kernel text - One for RO data - One for the rest Separating the mappings is done to be able to update the protection later when using STRICT_KERNEL_RWX. The ITLB miss handler now need to also handle huge TLBs unless kernel text in pinned. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c44f0ab5510474f25123d904cd1f4e5c6aa3c1ac.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Map IMMR with a huge pageChristophe Leroy1-6/+2
Map the IMMR area with a single 512k huge page. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9495dba06669da40e133f24607758fa6dcc65f66.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Add a function to early map kernel via huge pagesChristophe Leroy1-0/+52
Add a function to early map kernel memory using huge pages. For 512k pages, just use standard page table and map in using 512k pages. For 8M pages, create a hugepd table and populate the two PGD entries with it. This function can only be used to create page tables at startup. Once the regular SLAB allocation functions replace memblock functions, this function cannot allocate new pages anymore. However it can still update existing mappings with new protections. hugepd_none() macro is moved into asm/hugetlb.h to be usable outside of mm/hugetlbpage.c early_pte_alloc_kernel() is made visible. _PAGE_HUGE flag is now displayed by ptdump. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> [mpe: Change ptdump display to use "huge"] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/68325bcd3b6f93127f7810418a2352c3519066d6.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Drop special handling of Linear and IMMR mappings in I/D TLB ↵Christophe Leroy1-102/+1
handlers Up to now, linear and IMMR mappings are managed via huge TLB entries through specific code directly in TLB miss handlers. This implies some patching of the TLB miss handlers at startup, and a lot of dedicated code. Remove all this specific dedicated code. For now we are back to normal handling via standard 4k pages. In the next patches, linear memory mapping and IMMR mapping will be managed through huge pages. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/221b7e3ead80a5969629938c023f8cfe45fdd2fb.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Always pin TLBs at startup.Christophe Leroy1-18/+1
At startup, map 32 Mbytes of memory through 4 pages of 8M, and PIN them inconditionnaly. They need to be pinned because KASAN is using page tables early and the TLBs might be dynamically replaced otherwise. Remove RSV4I flag after installing mappings unless CONFIG_PIN_TLB_XXXX is selected. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b27c5767d18053b59f7eefddc189fcc3acf7b9c2.1589866984.git.christophe.leroy@csgroup.eu
2020-05-26powerpc/8xx: Don't set IMMR map anymore at bootChristophe Leroy1-4/+11
Only early debug requires IMMR to be mapped early. No need to set it up and pin it in assembly. Map it through page tables at udbg init when necessary. If CONFIG_PIN_TLB_IMMR is selected, pin it once we don't need the 32 Mb pinned RAM anymore. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/13c1e8539fdf363d3146f4884e5c3c76c6c308b5.1589866984.git.christophe.leroy@csgroup.eu
2020-05-19powerpc: Use a macro for creating instructions from u32sJordan Niethe1-2/+3
In preparation for instructions having a more complex data type start using a macro, ppc_inst(), for making an instruction out of a u32. A macro is used so that instructions can be used as initializer elements. Currently this does nothing, but it will allow for creating a data type that can represent prefixed instructions. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> [mpe: Change include guard to _ASM_POWERPC_INST_H] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Alistair Popple <alistair@popple.id.au> Link: https://lore.kernel.org/r/20200506034050.24806-7-jniethe5@gmail.com
2020-04-22powerpc/8xx: Fix STRICT_KERNEL_RWX startup test failureChristophe Leroy1-0/+3
WRITE_RO lkdtm test works. But when selecting CONFIG_DEBUG_RODATA_TEST, the kernel reports rodata_test: test data was not read only This is because when rodata test runs, there are still old entries in TLB. Flush TLB after setting kernel pages RO or NX. Fixes: d5f17ee96447 ("powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX") Cc: stable@vger.kernel.org # v5.1+ Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/485caac75f195f18c11eb077b0031fdd2bb7fb9e.1587361039.git.christophe.leroy@c-s.fr
2020-03-17powerpc/fsl_booke: Avoid creating duplicate tlb1 entryLaurentiu Tudor1-1/+11
In the current implementation, the call to loadcam_multi() is wrapped between switch_to_as1() and restore_to_as0() calls so, when it tries to create its own temporary AS=1 TLB1 entry, it ends up duplicating the existing one created by switch_to_as1(). Add a check to skip creating the temporary entry if already running in AS=1. Fixes: d9e1831a4202 ("powerpc/85xx: Load all early TLB entries at once") Cc: stable@vger.kernel.org # v4.4+ Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Acked-by: Scott Wood <oss@buserror.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200123111914.2565-1-laurentiu.tudor@nxp.com
2020-02-26powerpc/32: refactor pmd_offset(pud_offset(pgd_offset...Christophe Leroy1-2/+2
At several places pmd pointer is retrieved through the same action: pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); or pmd = pmd_offset(pud_offset(pgd_offset_k(addr), addr), addr); Refactor this by implementing two helpers pmd_ptr() and pmd_ptr_k() This will help when adding the p4d level. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7b065c5be35726af4066cab238ee35cabceda1fa.1578558199.git.christophe.leroy@c-s.fr
2020-01-23powerpc/8xx: Fix permanently mapped IMMR region.Christophe Leroy1-6/+7
When not using large TLBs, the IMMR region is still mapped as a whole block in the FIXMAP area. Properly report that the IMMR region is block-mapped even when not using large TLBs. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/45f4f414bcd7198b0755cf4287ff216fbfc24b9d.1574774187.git.christophe.leroy@c-s.fr
2019-12-16powerpc/8xx: fix bogus __init on mmu_mapin_ram_chunk()Christophe Leroy1-1/+1
Remove __init qualifier for mmu_mapin_ram_chunk() as it is called by mmu_mark_initmem_nx() and mmu_mark_rodata_ro() which are not __init functions. At the same time, mark it static as it is only used in this file. Reported-by: kbuild test robot <lkp@intel.com> Fixes: a2227a277743 ("powerpc/32: Don't populate page tables for block mapped pages except on the 8xx") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/56648921986a6b3e7315b1fbbf4684f21bd2dea8.1576310997.git.christophe.leroy@c-s.fr
2019-11-18powerpc/32: Don't populate page tables for block mapped pages except on the 8xx.Christophe Leroy1-3/+49
Commit d2f15e0979ee ("powerpc/32: always populate page tables for Abatron BDI.") wrongly sets page tables for any PPC32 for using BDI, and does't update them after init (remove RX on init section, set text and rodata read-only) Only the 8xx requires page tables to be populated for using the BDI. They also need to be populated in order to see the mappings in /sys/kernel/debug/kernel_page_tables On BOOK3S_32, pages that are not mapped by page tables are mapped by BATs. The BDI knows BATs and they can be viewed in /sys/kernel/debug/powerpc/block_address_translation Only set pagetables for RAM and IMMR on the 8xx and properly update them at the end of init. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c8610942203e0d93fcb02ad20c57edd3adb4c9d3.1566554029.git.christophe.leroy@c-s.fr
2019-11-13powerpc/fsl_booke/kaslr: support nokaslr cmdline parameterJason Yan1-0/+7
One may want to disable kaslr when boot, so provide a cmdline parameter 'nokaslr' to support this. Signed-off-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Diana Craciun <diana.craciun@nxp.com> Tested-by: Diana Craciun <diana.craciun@nxp.com> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-11-13powerpc/fsl_booke/kaslr: clear the original kernel if randomizedJason Yan2-0/+12
The original kernel still exists in the memory, clear it now. Signed-off-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Diana Craciun <diana.craciun@nxp.com> Tested-by: Diana Craciun <diana.craciun@nxp.com> Signed-off-by: Scott Wood <oss@buserror.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-11-13powerpc/fsl_booke/32: randomize the kernel image offsetJason Yan1-2/+323
After we have the basic support of relocate the kernel in some appropriate place, we can start to randomize the offset now. Entropy is derived from the banner and timer, which will change every build and boot. This not so much safe so additionally the bootloader may pass entropy via the /chosen/kaslr-seed node in device tree. We will use the first 512M of the low memory to randomize the kernel image. The memory will be split in 64M zones. We will use the lower 8 bit of the entropy to decide the index of the 64M zone. Then we chose a 16K aligned offset inside the 64M zone to put the kernel in. We also check if we will overlap with some areas like the dtb area, the initrd area or the crashkernel area. If we cannot find a proper area, kaslr will be disabled and boot from the original kernel. Some pieces of code are derived from arch/x86/boot/compressed/kaslr.c or arch/arm64/kernel/kaslr.c such as rotate_xor(). Credit goes to Kees and Ard. Signed-off-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Diana Craciun <diana.craciun@nxp.com> Tested-by: Diana Craciun <diana.craciun@nxp.com> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-11-13powerpc/fsl_booke/32: implement KASLR infrastructureJason Yan3-2/+68
This patch add support to boot kernel from places other than KERNELBASE. Since CONFIG_RELOCATABLE has already supported, what we need to do is map or copy kernel to a proper place and relocate. Freescale Book-E parts expect lowmem to be mapped by fixed TLB entries(TLB1). The TLB1 entries are not suitable to map the kernel directly in a randomized region, so we chose to copy the kernel to a proper place and restart to relocate. The offset of the kernel was not randomized yet(a fixed 64M is set). We will randomize it in the next patch. Signed-off-by: Jason Yan <yanaijie@huawei.com> Tested-by: Diana Craciun <diana.craciun@nxp.com> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net> [mpe: Use PTRRELOC() in early_init()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-08-27powerpc/mm: make ioremap_bot common to allChristophe Leroy1-0/+2
Drop multiple definitions of ioremap_bot and make one common to all subarches. Only CONFIG_PPC_BOOK3E_64 had a global static init value for ioremap_bot. Now ioremap_bot is set in early_init_mmu_global(). Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/920eebfd9f36f14c79d1755847f5bf7c83703bdd.1566309262.git.christophe.leroy@c-s.fr
2019-08-20powerpc/mm: move FSL_BOOK3 version of update_mmu_cache()Christophe Leroy1-2/+14
Move FSL_BOOK3E version of update_mmu_cache() at the same place as book3e_hugetlb_preload() as update_mmu_cache() is the only user of book3e_hugetlb_preload(). Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4d69fdc86df9c74adc71a60331a86f6afb8b5e9e.1565933217.git.christophe.leroy@c-s.fr
2019-08-12powerpc/64e: Drop stale call to smp_processor_id() which hangs SMP startupChristophe Leroy1-1/+0
Commit ebb9d30a6a74 ("powerpc/mm: any thread in one core can be the first to setup TLB1") removed the need to know the cpu_id in early_init_this_mmu(), but the call to smp_processor_id() which was marked __maybe_used remained. Since commit ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK") thread_info cannot be reached before MMU is properly set up. Drop this stale call to smp_processor_id() which makes SMP hang when CONFIG_PREEMPT is set. Fixes: ebb9d30a6a74 ("powerpc/mm: any thread in one core can be the first to setup TLB1") Fixes: ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK") Cc: stable@vger.kernel.org # v5.1+ Reported-by: Chris Packham <Chris.Packham@alliedtelesis.co.nz> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bef479514f4c08329fa649f67735df8918bc0976.1565268248.git.christophe.leroy@c-s.fr
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner9-51/+9
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03powerpc/book3e: move early_alloc_pgtable() to init sectionChristophe Leroy1-2/+2
early_alloc_pgtable() is only used during init. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/book3e: hugetlbpage is only for CONFIG_PPC_FSL_BOOK3EChristophe Leroy2-29/+20
As per Kconfig.cputype, only CONFIG_PPC_FSL_BOOK3E gets to select SYS_SUPPORTS_HUGETLBFS so simplify accordingly. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/64: only book3s/64 supports CONFIG_PPC_64K_PAGESChristophe Leroy2-44/+0
CONFIG_PPC_64K_PAGES cannot be selected by nohash/64. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/book3e: drop mmu_get_tsize()Christophe Leroy1-5/+0
This function is not used anymore, drop it. Fixes: b42279f0165c ("powerpc/mm/nohash: MM_SLICE is only used by book3s 64") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: define subarch SLB_ADDR_LIMIT_DEFAULTChristophe Leroy1-3/+1
This patch defines a subarch specific SLB_ADDR_LIMIT_DEFAULT to remove the #ifdefs around the setup of mm->context.slb_addr_limit It also generalises the use of mm_ctx_set_slb_addr_limit() helper. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: Move nohash specifics in subdirectory mm/nohashChristophe Leroy11-0/+4392
Many files in arch/powerpc/mm are only for nohash. This patch creates a subdirectory for them. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Shorten new filenames] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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