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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 asm updates from Ingo Molnar:
 "The main changes in this cycle were the fsgsbase related preparatory
  patches from Chang S. Bae - but there's also an optimized
  memcpy_flushcache() and a cleanup for the __cmpxchg_double() assembly
  glue"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fsgsbase/64: Clean up various details
  x86/segments: Introduce the 'CPUNODE' naming to better document the segment limit CPU/node NR trick
  x86/vdso: Initialize the CPU/node NR segment descriptor earlier
  x86/vdso: Introduce helper functions for CPU and node number
  x86/segments/64: Rename the GDT PER_CPU entry to CPU_NUMBER
  x86/fsgsbase/64: Factor out FS/GS segment loading from __switch_to()
  x86/fsgsbase/64: Convert the ELF core dump code to the new FSGSBASE helpers
  x86/fsgsbase/64: Make ptrace use the new FS/GS base helpers
  x86/fsgsbase/64: Introduce FS/GS base helper functions
  x86/fsgsbase/64: Fix ptrace() to read the FS/GS base accurately
  x86/asm: Use CC_SET()/CC_OUT() in __cmpxchg_double()
  x86/asm: Optimize memcpy_flushcache()
This commit is contained in:
Linus Torvalds
2018-10-23 15:24:22 +01:00
parent cbbfb0ae2c ec3a94188d
commit e1d20beae7
12 changed files with 299 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/entry/vdso/vgetcpu.c
View File

@@ -13,14 +13,8 @@
notrace long
__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
{
unsigned int p;
vdso_read_cpunode(cpu, node);
p = __getcpu();
if (cpu)
*cpu = p & VGETCPU_CPU_MASK;
if (node)
*node = p >> 12;
return 0;
}

38
arch/x86/entry/vdso/vma.c
View File

@@ -332,40 +332,6 @@ static __init int vdso_setup(char *s)
return 0;
}
__setup("vdso=", vdso_setup);
#endif
#ifdef CONFIG_X86_64
static void vgetcpu_cpu_init(void *arg)
{
int cpu = smp_processor_id();
struct desc_struct d = { };
unsigned long node = 0;
#ifdef CONFIG_NUMA
node = cpu_to_node(cpu);
#endif
if (static_cpu_has(X86_FEATURE_RDTSCP))
write_rdtscp_aux((node << 12) | cpu);
/*
* Store cpu number in limit so that it can be loaded
* quickly in user space in vgetcpu. (12 bits for the CPU
* and 8 bits for the node)
*/
d.limit0 = cpu | ((node & 0xf) << 12);
d.limit1 = node >> 4;
d.type = 5; /* RO data, expand down, accessed */
d.dpl = 3; /* Visible to user code */
d.s = 1; /* Not a system segment */
d.p = 1; /* Present */
d.d = 1; /* 32-bit */
write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);
}
static int vgetcpu_online(unsigned int cpu)
{
return smp_call_function_single(cpu, vgetcpu_cpu_init, NULL, 1);
}
static int __init init_vdso(void)
{
@@ -375,9 +341,7 @@ static int __init init_vdso(void)
init_vdso_image(&vdso_image_x32);
#endif
/* notifier priority > KVM */
return cpuhp_setup_state(CPUHP_AP_X86_VDSO_VMA_ONLINE,
"x86/vdso/vma:online", vgetcpu_online, NULL);
return 0;
}
subsys_initcall(init_vdso);
#endif /* CONFIG_X86_64 */