linux/arch/x86
H. Peter Anvin 3578baaed4 x86, mm: Redesign get_user with a __builtin_choose_expr hack
Instead of using a bitfield, use an odd little trick using typeof,
__builtin_choose_expr, and sizeof.  __builtin_choose_expr is
explicitly defined to not convert its type (its argument is required
to be a constant expression) so this should be well-defined.

The code is still not 100% preturbation-free versus the baseline
before 64-bit get_user(), but the differences seem to be very small,
mostly related to padding and to gcc deciding when to spill registers.

Cc: Jamie Lokier <jamie@shareable.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: H. J. Lu <hjl.tools@gmail.com>
Link: http://lkml.kernel.org/r/511A8922.6050908@zytor.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-02-12 12:46:40 -08:00
..
boot x86, efi: correct precedence of operators in setup_efi_pci 2012-12-20 11:47:14 -08:00
configs x86/Kconfig: Turn off DEBUG_NX_TEST module in defconfigs 2012-09-05 10:43:12 +02:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2012-12-15 12:35:19 -08:00
ia32 new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those 2012-12-19 18:07:41 -05:00
include x86, mm: Redesign get_user with a __builtin_choose_expr hack 2013-02-12 12:46:40 -08:00
kernel x86/kvm: Fix compile warning in kvm_register_steal_time() 2013-02-11 11:04:31 +01:00
kvm KVM: x86: use dynamic percpu allocations for shared msrs area 2013-01-08 12:51:56 -02:00
lguest Linux 3.8-rc5 2013-01-25 16:31:21 -08:00
lib x86: Be consistent with data size in getuser.S 2013-02-11 23:14:48 -08:00
math-emu
mm x86-32, mm: Remove reference to alloc_remap() 2013-01-31 14:12:30 -08:00
net x86: bpf_jit_comp: add vlan tag support 2012-10-31 14:00:15 -04:00
oprofile oprofile, x86: Fix wrapping bug in op_x86_get_ctrl() 2012-10-15 14:38:24 +02:00
pci X86: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
platform Linux 3.8-rc5 2013-01-25 16:31:21 -08:00
power x86-32, mm: Remove reference to resume_map_numa_kva() 2013-01-31 14:12:30 -08:00
realmode Revert "x86, mm: Include the entire kernel memory map in trampoline_pgd" 2012-12-15 12:29:54 -08:00
syscalls Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00
tools x86: Fix the error of using "const" in gen-insn-attr-x86.awk 2012-12-10 10:31:24 -08:00
um Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00
vdso Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-12-13 15:31:08 -08:00
video x86: Use vga_default_device() when determining whether an fb is primary 2012-04-24 09:50:17 +01:00
xen Fixes: 2013-01-18 12:02:52 -08:00
.gitignore
Kbuild x86, realmode: realmode.bin infrastructure 2012-05-08 11:41:48 -07:00
Kconfig x86-32, mm: Rip out x86_32 NUMA remapping code 2013-01-31 14:12:30 -08:00
Kconfig.cpu x86, 386 removal: Document Nx586 as a 386 and thus unsupported 2012-11-29 13:28:39 -08:00
Kconfig.debug x86/tlb: add tlb_flushall_shift knob into debugfs 2012-06-27 19:29:10 -07:00
Makefile md update for 3.8 2012-12-18 09:32:44 -08:00
Makefile_32.cpu x86, 386 removal: Remove CONFIG_M386 from Kconfig 2012-11-29 13:23:01 -08:00
Makefile.um um: fix linker script generation 2012-04-09 13:59:00 -04:00