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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0415b00d17
Percpu allocator honors alignment request upto PAGE_SIZE and both the percpu addresses in the percpu address space and the translated kernel addresses should be aligned accordingly. The calculation of the former depends on the alignment of percpu output section in the kernel image. The linker script macros PERCPU_VADDR() and PERCPU() are used to define this output section and the latter takes @align parameter. Several architectures are using @align smaller than PAGE_SIZE breaking percpu memory alignment. This patch removes @align parameter from PERCPU(), renames it to PERCPU_SECTION() and makes it always align to PAGE_SIZE. While at it, add PCPU_SETUP_BUG_ON() checks such that alignment problems are reliably detected and remove percpu alignment comment recently added in workqueue.c as the condition would trigger BUG way before reaching there. For um, this patch raises the alignment of percpu area. As the area is in .init, there shouldn't be any noticeable difference. This problem was discovered by David Howells while debugging boot failure on mn10300. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Mike Frysinger <vapier@gentoo.org> Cc: uclinux-dist-devel@blackfin.uclinux.org Cc: David Howells <dhowells@redhat.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: user-mode-linux-devel@lists.sourceforge.net
93 lines
2.1 KiB
ArmAsm
93 lines
2.1 KiB
ArmAsm
/* MN10300 Main kernel linker script
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define __VMLINUX_LDS__
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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OUTPUT_FORMAT("elf32-am33lin", "elf32-am33lin", "elf32-am33lin")
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OUTPUT_ARCH(mn10300)
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ENTRY(_start)
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jiffies = jiffies_64;
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#ifndef CONFIG_MN10300_CURRENT_IN_E2
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current = __current;
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#endif
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SECTIONS
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{
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. = CONFIG_KERNEL_TEXT_ADDRESS;
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/* read-only */
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_stext = .;
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_text = .; /* Text and read-only data */
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.text : {
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HEAD_TEXT
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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*(.fixup)
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*(.gnu.warning)
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} = 0xcb
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_etext = .; /* End of text section */
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EXCEPTION_TABLE(16)
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BUG_TABLE
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RO_DATA(PAGE_SIZE)
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/* writeable */
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RW_DATA_SECTION(32, PAGE_SIZE, THREAD_SIZE)
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_edata = .;
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/* might get freed after init */
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. = ALIGN(PAGE_SIZE);
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.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
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__smp_locks = .;
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*(.smp_locks)
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__smp_locks_end = .;
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}
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/* will be freed after init */
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. = ALIGN(PAGE_SIZE); /* Init code and data */
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__init_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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INIT_DATA_SECTION(16)
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. = ALIGN(4);
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__alt_instructions = .;
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.altinstructions : { *(.altinstructions) }
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__alt_instructions_end = .;
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.altinstr_replacement : { *(.altinstr_replacement) }
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/* .exit.text is discard at runtime, not link time, to deal with references
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from .altinstructions and .eh_frame */
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.exit.text : { EXIT_TEXT; }
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.exit.data : { EXIT_DATA; }
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PERCPU_SECTION(32)
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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/* freed after init ends here */
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BSS_SECTION(0, PAGE_SIZE, 4)
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_end = . ;
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/* This is where the kernel creates the early boot page tables */
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. = ALIGN(PAGE_SIZE);
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pg0 = .;
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STABS_DEBUG
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DWARF_DEBUG
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/* Sections to be discarded */
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DISCARDS
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}
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