mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
c2daa3bed5
Convert x86 to use a per-cpu preemption count. The reason for doing so is that accessing per-cpu variables is a lot cheaper than accessing thread_info variables. We still need to save/restore the actual preemption count due to PREEMPT_ACTIVE so we place the per-cpu __preempt_count variable in the same cache-line as the other hot __switch_to() variables such as current_task. NOTE: this save/restore is required even for !PREEMPT kernels as cond_resched() also relies on preempt_count's PREEMPT_ACTIVE to ignore task_struct::state. Also rename thread_info::preempt_count to ensure nobody is 'accidentally' still poking at it. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-gzn5rfsf8trgjoqx8hyayy3q@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#define COMPILE_OFFSETS
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#include <linux/crypto.h>
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#include <linux/sched.h>
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#include <linux/stddef.h>
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#include <linux/hardirq.h>
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#include <linux/suspend.h>
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#include <linux/kbuild.h>
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#include <asm/processor.h>
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#include <asm/thread_info.h>
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#include <asm/sigframe.h>
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#include <asm/bootparam.h>
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#include <asm/suspend.h>
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#ifdef CONFIG_XEN
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#include <xen/interface/xen.h>
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#endif
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#ifdef CONFIG_X86_32
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# include "asm-offsets_32.c"
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#else
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# include "asm-offsets_64.c"
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#endif
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void common(void) {
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BLANK();
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OFFSET(TI_flags, thread_info, flags);
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OFFSET(TI_status, thread_info, status);
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OFFSET(TI_addr_limit, thread_info, addr_limit);
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BLANK();
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OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
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BLANK();
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OFFSET(pbe_address, pbe, address);
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OFFSET(pbe_orig_address, pbe, orig_address);
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OFFSET(pbe_next, pbe, next);
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#ifdef CONFIG_PARAVIRT
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BLANK();
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OFFSET(PARAVIRT_enabled, pv_info, paravirt_enabled);
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OFFSET(PARAVIRT_PATCH_pv_cpu_ops, paravirt_patch_template, pv_cpu_ops);
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OFFSET(PARAVIRT_PATCH_pv_irq_ops, paravirt_patch_template, pv_irq_ops);
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OFFSET(PV_IRQ_irq_disable, pv_irq_ops, irq_disable);
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OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
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OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
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OFFSET(PV_CPU_irq_enable_sysexit, pv_cpu_ops, irq_enable_sysexit);
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OFFSET(PV_CPU_read_cr0, pv_cpu_ops, read_cr0);
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OFFSET(PV_MMU_read_cr2, pv_mmu_ops, read_cr2);
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#endif
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#ifdef CONFIG_XEN
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BLANK();
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OFFSET(XEN_vcpu_info_mask, vcpu_info, evtchn_upcall_mask);
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OFFSET(XEN_vcpu_info_pending, vcpu_info, evtchn_upcall_pending);
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#endif
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BLANK();
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OFFSET(BP_scratch, boot_params, scratch);
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OFFSET(BP_loadflags, boot_params, hdr.loadflags);
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OFFSET(BP_hardware_subarch, boot_params, hdr.hardware_subarch);
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OFFSET(BP_version, boot_params, hdr.version);
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OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment);
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OFFSET(BP_pref_address, boot_params, hdr.pref_address);
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OFFSET(BP_code32_start, boot_params, hdr.code32_start);
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BLANK();
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DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
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}
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