linux/arch/x86
Andy Lutomirski fd143b210e x86, entry: Only call user_exit if TIF_NOHZ
The RCU context tracking code requires that arch code call
user_exit() on any entry into kernel code if TIF_NOHZ is set.  This
patch adds a check for TIF_NOHZ and a comment to the syscall entry
tracing code.

The main purpose of this patch is to make the code easier to follow:
one can read the body of user_exit and of every function it calls
without finding any explanation of why it's called for traced
syscalls but not for untraced syscalls.  This makes it clear when
user_exit() is necessary.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/0b13e0e24ec0307d67ab7a23b58764f6b1270116.1409954077.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2014-09-08 14:13:59 -07:00
..
boot * Enforce CONFIG_RELOCATABLE for the x86 EFI boot stub, otherwise 2014-08-11 13:58:54 -07:00
configs USB: remove CONFIG_USB_DEBUG from defconfig files 2014-05-28 09:40:45 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2014-08-04 09:52:51 -07:00
ia32 x86, vdso: Reimplement vdso.so preparation in build-time C 2014-05-05 13:18:51 -07:00
include Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-08-29 17:22:27 -07:00
kernel x86, entry: Only call user_exit if TIF_NOHZ 2014-09-08 14:13:59 -07:00
kvm KVM: x86: do not check CS.DPL against RPL during task switch 2014-08-19 15:12:28 +02:00
lguest asmlinkage, x86: Add explicit __visible to arch/x86/* 2014-05-05 16:07:44 -07:00
lib Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-06-12 19:18:49 -07:00
math-emu asmlinkage, x86: Add explicit __visible to arch/x86/* 2014-05-05 16:07:44 -07:00
mm * WARN_ON(!spin_is_locked()) always triggers on non-SMP machines. 2014-08-22 10:04:15 +02:00
net net: filter: split 'struct sk_filter' into socket and bpf parts 2014-08-02 15:03:58 -07:00
oprofile x86, oprofile, nmi: Fix CPU hotplug callback registration 2014-03-20 13:43:43 +01:00
pci x86, irq, PCI: Keep IRQ assignment for runtime power management 2014-08-29 13:38:00 +02:00
platform Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-08-13 18:23:32 -06:00
power x86, power, suspend: Annotate restore_processor_state() with notrace 2014-07-17 09:45:05 -04:00
purgatory x86/purgatory: use approprate -m64/-32 build flag for arch/x86/purgatory 2014-08-29 16:28:16 -07:00
realmode x86/build: Supress realmode.bin is up to date message 2014-04-16 15:17:24 +02:00
syscalls kexec: new syscall kexec_file_load() declaration 2014-08-08 15:57:32 -07:00
tools x86/build: Supress "Nothing to be done for ..." messages 2014-04-14 11:44:36 +02:00
um Merge branch 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc 2014-08-09 09:58:12 -07:00
vdso arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area 2014-08-08 15:57:27 -07:00
video
xen x86/xen: use vmap() to map grant table pages in PVH guests 2014-08-11 11:59:35 +01:00
.gitignore
Kbuild kexec: create a new config option CONFIG_KEXEC_FILE for new syscall 2014-08-29 16:28:16 -07:00
Kconfig kexec: create a new config option CONFIG_KEXEC_FILE for new syscall 2014-08-29 16:28:16 -07:00
Kconfig.cpu Merge branch 'x86-nuke-platforms-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-02 13:15:58 -07:00
Kconfig.debug x86/efi: Dump the EFI page table 2014-03-04 16:17:17 +00:00
Makefile kexec: purgatory: add clean-up for purgatory directory 2014-08-29 16:28:17 -07:00
Makefile_32.cpu
Makefile.um