mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +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>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* Generate definitions needed by assembly language modules.
|
|
* This code generates raw asm output which is post-processed to extract
|
|
* and format the required data.
|
|
*/
|
|
#define COMPILE_OFFSETS
|
|
|
|
#include <linux/crypto.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/kbuild.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/sigframe.h>
|
|
#include <asm/bootparam.h>
|
|
#include <asm/suspend.h>
|
|
|
|
#ifdef CONFIG_XEN
|
|
#include <xen/interface/xen.h>
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# include "asm-offsets_32.c"
|
|
#else
|
|
# include "asm-offsets_64.c"
|
|
#endif
|
|
|
|
void common(void) {
|
|
BLANK();
|
|
OFFSET(TI_flags, thread_info, flags);
|
|
OFFSET(TI_status, thread_info, status);
|
|
OFFSET(TI_addr_limit, thread_info, addr_limit);
|
|
|
|
BLANK();
|
|
OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
|
|
|
|
BLANK();
|
|
OFFSET(pbe_address, pbe, address);
|
|
OFFSET(pbe_orig_address, pbe, orig_address);
|
|
OFFSET(pbe_next, pbe, next);
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
BLANK();
|
|
OFFSET(PARAVIRT_enabled, pv_info, paravirt_enabled);
|
|
OFFSET(PARAVIRT_PATCH_pv_cpu_ops, paravirt_patch_template, pv_cpu_ops);
|
|
OFFSET(PARAVIRT_PATCH_pv_irq_ops, paravirt_patch_template, pv_irq_ops);
|
|
OFFSET(PV_IRQ_irq_disable, pv_irq_ops, irq_disable);
|
|
OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
|
|
OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
|
|
OFFSET(PV_CPU_irq_enable_sysexit, pv_cpu_ops, irq_enable_sysexit);
|
|
OFFSET(PV_CPU_read_cr0, pv_cpu_ops, read_cr0);
|
|
OFFSET(PV_MMU_read_cr2, pv_mmu_ops, read_cr2);
|
|
#endif
|
|
|
|
#ifdef CONFIG_XEN
|
|
BLANK();
|
|
OFFSET(XEN_vcpu_info_mask, vcpu_info, evtchn_upcall_mask);
|
|
OFFSET(XEN_vcpu_info_pending, vcpu_info, evtchn_upcall_pending);
|
|
#endif
|
|
|
|
BLANK();
|
|
OFFSET(BP_scratch, boot_params, scratch);
|
|
OFFSET(BP_loadflags, boot_params, hdr.loadflags);
|
|
OFFSET(BP_hardware_subarch, boot_params, hdr.hardware_subarch);
|
|
OFFSET(BP_version, boot_params, hdr.version);
|
|
OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment);
|
|
OFFSET(BP_pref_address, boot_params, hdr.pref_address);
|
|
OFFSET(BP_code32_start, boot_params, hdr.code32_start);
|
|
|
|
BLANK();
|
|
DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
|
|
}
|