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

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Pull x86 fixes from Ingo Molnar:
 "Two FPU rewrite related fixes.  This addresses all known x86
  regressions at this stage.  Also some other misc fixes"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Fix boot crash in the early FPU code
  x86/asm/entry/64: Update path names
  x86/fpu: Fix FPU related boot regression when CPUID masking BIOS feature is enabled
  x86/boot/setup: Clean up the e820_reserve_setup_data() code
  x86/kaslr: Fix typo in the KASLR_FLAG documentation
This commit is contained in:
Linus Torvalds 2015-07-04 08:58:50 -07:00
commit b1be9ead13
5 changed files with 13 additions and 13 deletions
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2
Documentation/x86/boot.txt
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@ -406,7 +406,7 @@ Protocol: 2.00+
- If 0, the protected-mode code is loaded at 0x10000.
- If 1, the protected-mode code is loaded at 0x100000.
Bit 1 (kernel internal): ALSR_FLAG
Bit 1 (kernel internal): KASLR_FLAG
- Used internally by the compressed kernel to communicate
KASLR status to kernel proper.
If 1, KASLR enabled.

8
Documentation/x86/entry_64.txt
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@ -1,14 +1,14 @@
This file documents some of the kernel entries in
arch/x86/kernel/entry_64.S. A lot of this explanation is adapted from
arch/x86/entry/entry_64.S. A lot of this explanation is adapted from
an email from Ingo Molnar:
http://lkml.kernel.org/r/<20110529191055.GC9835%40elte.hu>
The x86 architecture has quite a few different ways to jump into
kernel code. Most of these entry points are registered in
arch/x86/kernel/traps.c and implemented in arch/x86/kernel/entry_64.S
for 64-bit, arch/x86/kernel/entry_32.S for 32-bit and finally
arch/x86/ia32/ia32entry.S which implements the 32-bit compatibility
arch/x86/kernel/traps.c and implemented in arch/x86/entry/entry_64.S
for 64-bit, arch/x86/entry/entry_32.S for 32-bit and finally
arch/x86/entry/entry_64_compat.S which implements the 32-bit compatibility
syscall entry points and thus provides for 32-bit processes the
ability to execute syscalls when running on 64-bit kernels.

2
arch/x86/kernel/cpu/common.c
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@ -742,7 +742,6 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
cpu_detect(c);
get_cpu_vendor(c);
get_cpu_cap(c);
fpu__init_system(c);
if (this_cpu->c_early_init)
this_cpu->c_early_init(c);
@ -754,6 +753,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
this_cpu->c_bsp_init(c);
setup_force_cpu_cap(X86_FEATURE_ALWAYS);
fpu__init_system(c);
}
void __init early_cpu_init(void)

7
arch/x86/kernel/fpu/init.c
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@ -95,11 +95,12 @@ static void __init fpu__init_system_mxcsr(void)
unsigned int mask = 0;
if (cpu_has_fxsr) {
struct fxregs_state fx_tmp __aligned(32) = { };
/* Static because GCC does not get 16-byte stack alignment right: */
static struct fxregs_state fxregs __initdata;
asm volatile("fxsave %0" : "+m" (fx_tmp));
asm volatile("fxsave %0" : "+m" (fxregs));
mask = fx_tmp.mxcsr_mask;
mask = fxregs.mxcsr_mask;
/*
* If zero then use the default features mask,

7
arch/x86/kernel/setup.c
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@ -461,19 +461,18 @@ static void __init e820_reserve_setup_data(void)
{
struct setup_data *data;
u64 pa_data;
int found = 0;
pa_data = boot_params.hdr.setup_data;
if (!pa_data)
return;
while (pa_data) {
data = early_memremap(pa_data, sizeof(*data));
e820_update_range(pa_data, sizeof(*data)+data->len,
E820_RAM, E820_RESERVED_KERN);
found = 1;
pa_data = data->next;
early_memunmap(data, sizeof(*data));
}
if (!found)
return;
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
memcpy(&e820_saved, &e820, sizeof(struct e820map));