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Andy Lutomirski 85191ed0a2 x86/fpu: Fix math emulation in eager fpu mode 
commit 4ecd16ec70 upstream.

Systems without an FPU are generally old and therefore use lazy FPU
switching. Unsurprisingly, math emulation in eager FPU mode is a
bit buggy. Fix it.

There were two bugs involving kernel code trying to use the FPU
registers in eager mode even if they didn't exist and one BUG_ON()
that was incorrect.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: yu-cheng yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/b4b8d112436bd6fab866e1b4011131507e8d7fbe.1453675014.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-16 09:54:25 +02:00
..
acpi
x86/acpi: Reduce code duplication in mp_override_legacy_irq()
2018-01-17 09:35:26 +01:00
apic
x86/apic: Set up through-local-APIC mode on the boot CPU if 'noapic' specified
2018-05-30 07:49:16 +02:00
cpu
x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros
2018-06-16 09:54:24 +02:00
fpu
x86/fpu: Fix math emulation in eager fpu mode
2018-06-16 09:54:25 +02:00
kprobes
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
2018-04-08 11:51:56 +02:00
.gitignore
…
alternative.c
x86/paravirt: Remove 'noreplace-paravirt' cmdline option
2018-02-25 11:03:54 +01:00
amd_gart_64.c
…
amd_nb.c
…
apb_timer.c
…
aperture_64.c
…
apm_32.c
…
asm-offsets_32.c
…
asm-offsets_64.c
…
asm-offsets.c
…
audit_64.c
…
bootflag.c
…
check.c
…
cpuid.c
…
crash_dump_32.c
…
crash_dump_64.c
…
crash.c
…
devicetree.c
x86/devicetree: Fix device IRQ settings in DT
2018-05-30 07:49:13 +02:00
doublefault.c
…
dumpstack_32.c
…
dumpstack_64.c
…
dumpstack.c
…
e820.c
…
early_printk.c
…
early-quirks.c
…
espfix_64.c
kaiser: add "nokaiser" boot option, using ALTERNATIVE
2018-01-05 15:44:25 +01:00
ftrace.c
ftrace/x86: Fix triple fault with graph tracing and suspend-to-ram
2017-05-02 21:19:56 -07:00
head32.c
…
head64.c
x86/kasan: Fix boot with KASAN=y and PROFILE_ANNOTATED_BRANCHES=y
2017-03-22 12:04:18 +01:00
head_32.S
x86/boot: Avoid warning for zero-filling .bss
2018-02-25 11:03:44 +01:00
head_64.S
KPTI: Rename to PAGE_TABLE_ISOLATION
2018-01-05 15:44:26 +01:00
head.c
…
hpet.c
x86/hpet: Prevent might sleep splat on resume
2017-12-16 10:33:51 +01:00
hw_breakpoint.c
x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros
2018-06-16 09:54:24 +02:00
i386_ksyms_32.c
x86/hweight: Get rid of the special calling convention
2018-04-24 09:32:04 +02:00
i8237.c
…
i8253.c
…
i8259.c
x86: i8259: export legacy_pic symbol
2018-03-24 10:58:40 +01:00
io_delay.c
…
ioport.c
…
irq_32.c
x86/retpoline/irq32: Convert assembler indirect jumps
2018-01-23 19:50:13 +01:00
irq_64.c
…
irq_work.c
…
irq.c
x86/irq: Do not substract irq_tlb_count from irq_call_count
2017-12-25 14:22:09 +01:00
irqinit.c
KAISER: Kernel Address Isolation
2018-01-05 15:44:23 +01:00
jump_label.c
…
kdebugfs.c
…
kexec-bzimage64.c
…
kgdb.c
…
ksysfs.c
…
kvm.c
KVM: async_pf: make rcu irq exit if not triggered from idle task
2017-08-11 09:08:47 -07:00
kvmclock.c
x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap
2018-01-05 15:44:27 +01:00
ldt.c
kaiser: fix unlikely error in alloc_ldt_struct()
2018-01-05 15:44:25 +01:00
livepatch.c
…
machine_kexec_32.c
x86/kexec: Avoid double free_page() upon do_kexec_load() failure
2018-05-26 08:49:01 +02:00
machine_kexec_64.c
x86/kexec: Avoid double free_page() upon do_kexec_load() failure
2018-05-26 08:49:01 +02:00
Makefile
…
mcount_64.S
x86/retpoline/ftrace: Convert ftrace assembler indirect jumps
2018-01-23 19:50:13 +01:00
mmconf-fam10h_64.c
…
module.c
x86: Treat R_X86_64_PLT32 as R_X86_64_PC32
2018-03-18 11:17:52 +01:00
mpparse.c
…
msr.c
…
nmi_selftest.c
…
nmi.c
…
paravirt_patch_32.c
…
paravirt_patch_64.c
x86/paravirt: Dont patch flush_tlb_single
2018-01-05 15:44:26 +01:00
paravirt-spinlocks.c
…
paravirt.c
…
pci-calgary_64.c
x86/pci-calgary: Fix iommu_free() comparison of unsigned expression >= 0
2017-05-14 13:32:55 +02:00
pci-dma.c
…
pci-iommu_table.c
…
pci-nommu.c
…
pci-swiotlb.c
…
pcspeaker.c
…
perf_regs.c
…
pmem.c
…
probe_roms.c
…
process_32.c
…
process_64.c
…
process.c
KAISER: Kernel Address Isolation
2018-01-05 15:44:23 +01:00
ptrace.c
…
pvclock.c
…
quirks.c
…
reboot_fixups_32.c
…
reboot.c
x86/mm/64: Fix reboot interaction with CR4.PCIDE
2018-01-02 20:33:24 +01:00
relocate_kernel_32.S
…
relocate_kernel_64.S
…
resource.c
…
rtc.c
…
setup_percpu.c
…
setup.c
x86/kaiser: Move feature detection up
2018-01-05 15:44:26 +01:00
signal_compat.c
…
signal.c
…
smp.c
…
smpboot.c
x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros
2018-06-16 09:54:24 +02:00
stacktrace.c
…
step.c
…
sys_x86_64.c
mm: larger stack guard gap, between vmas
2017-06-26 07:13:11 +02:00
sysfb_efi.c
…
sysfb_simplefb.c
…
sysfb.c
…
tboot.c
x86/pti: Make unpoison of pgd for trusted boot work for real
2018-02-03 17:04:25 +01:00
tce_64.c
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test_nx.c
…
test_rodata.c
…
time.c
…
tls.c
…
tls.h
…
topology.c
…
trace_clock.c
…
tracepoint.c
kaiser: merged update
2018-01-05 15:44:23 +01:00
traps.c
x86/fpu: Fix math emulation in eager fpu mode
2018-06-16 09:54:25 +02:00
tsc_msr.c
…
tsc_sync.c
…
tsc.c
x86/tsc: Prevent 32bit truncation in calc_hpet_ref()
2018-04-29 07:50:01 +02:00
uprobes.c
…
verify_cpu.S
…
vm86_32.c
x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros
2018-06-16 09:54:24 +02:00
vmlinux.lds.S
retpoline: Introduce start/end markers of indirect thunk
2018-01-23 19:50:17 +01:00
vsmp_64.c
…
x86_init.c
…
x8664_ksyms_64.c
x86/hweight: Get rid of the special calling convention
2018-04-24 09:32:04 +02:00