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
131 lines
2.6 KiB
ArmAsm
131 lines
2.6 KiB
ArmAsm
/* ld script to make the Linux/CRIS kernel
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* It is VERY DANGEROUS to fiddle around with the symbols in this
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* script. It is for example quite vital that all generated sections
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* that are used are actually named here, otherwise the linker will
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* put them at the end, where the init stuff is which is FREED after
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* the kernel has booted.
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/page.h>
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#ifdef CONFIG_ETRAX_VMEM_SIZE
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#define __CONFIG_ETRAX_VMEM_SIZE CONFIG_ETRAX_VMEM_SIZE
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#else
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#define __CONFIG_ETRAX_VMEM_SIZE 0
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#endif
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jiffies = jiffies_64;
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SECTIONS
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{
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. = DRAM_VIRTUAL_BASE;
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dram_start = .;
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#ifdef CONFIG_ETRAX_ARCH_V10
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ibr_start = .;
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#else
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ebp_start = .;
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/* The boot section is only necessary until the VCS top */
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/* level testbench includes both flash and DRAM. */
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.boot : { *(.boot) }
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#endif
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/* see head.S and pages reserved at the start */
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. = DRAM_VIRTUAL_BASE + 0x4000;
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_text = .; /* Text and read-only data. */
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text_start = .; /* Lots of aliases. */
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_stext = .;
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__stext = .;
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.text : {
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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*(.fixup)
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*(.text.__*)
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}
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_etext = . ; /* End of text section. */
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__etext = .;
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EXCEPTION_TABLE(4)
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RODATA
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. = ALIGN (4);
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___data_start = . ;
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__Sdata = . ;
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.data : { /* Data */
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CACHELINE_ALIGNED_DATA(32)
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READ_MOSTLY_DATA(32)
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DATA_DATA
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}
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__edata = . ; /* End of data section. */
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_edata = . ;
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INIT_TASK_DATA_SECTION(PAGE_SIZE)
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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 : { INIT_DATA }
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.init.setup : { INIT_SETUP(16) }
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.initcall.init : {
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INIT_CALLS
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}
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.con_initcall.init : {
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CON_INITCALL
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}
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SECURITY_INIT
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/* .exit.text is discarded at runtime, not link time,
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* to deal with references from __bug_table
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*/
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.exit.text : {
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EXIT_TEXT
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}
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.exit.data : {
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EXIT_DATA
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}
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#ifdef CONFIG_ETRAX_ARCH_V10
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#ifdef CONFIG_BLK_DEV_INITRD
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.init.ramfs : {
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__initramfs_start = .;
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*(.init.ramfs)
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__initramfs_end = .;
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}
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#endif
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#endif
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__vmlinux_end = .; /* Last address of the physical file. */
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#ifdef CONFIG_ETRAX_ARCH_V32
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PERCPU_SECTION(32)
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.init.ramfs : {
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INIT_RAM_FS
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}
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#endif
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/*
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* We fill to the next page, so we can discard all init
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* pages without needing to consider what payload might be
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* appended to the kernel image.
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*/
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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__data_end = . ; /* Move to _edata ? */
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BSS_SECTION(1, 1, 1)
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. = ALIGN (0x20);
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_end = .;
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__end = .;
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dram_end = dram_start + (CONFIG_ETRAX_DRAM_SIZE - __CONFIG_ETRAX_VMEM_SIZE)*1024*1024;
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DISCARDS
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}
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