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Andy Lutomirski 79615afc19 selftests/x86: Consolidate and fix get/set_eflags() helpers 
commit cced0b24bb545bfe74fea96de84adc23c0146b05 upstream.
Backport summary: for 5.4 kernel fsgsbase support.

There are several copies of get_eflags() and set_eflags() and they all are
buggy.  Consolidate them and fix them.  The fixes are:

Add memory clobbers.  These are probably unnecessary but they make sure
that the compiler doesn't move something past one of these calls when it
shouldn't.

Respect the redzone on x86_64.  There has no failure been observed related
to this, but it's definitely a bug.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/982ce58ae8dea2f1e57093ee894760e35267e751.1593191971.git.luto@kernel.org

(cherry picked from commit cced0b24bb545bfe74fea96de84adc23c0146b05)
Signed-off-by: Ethan Zhao <Haifeng.Zhao@intel.com>
 		2021-07-21 20:42:45 +08:00
..
accounting Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch ia64: tools: remove duplicate definition of ia64_mf() on ia64 2021-05-20 16:07:15 +08:00
bpf bpftool: Fix compilation failure for net.o with older glibc 2021-04-12 12:51:19 +08:00
build tools: Factor HOSTCC, HOSTLD, HOSTAR definitions 2021-04-12 12:51:42 +08:00
cgroup iocost_monitor: drop string wrap around numbers when outputting json 2021-03-16 16:29:27 +08:00
debugging Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
firewire Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
firmware Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
gpio tools: gpio-hammer: Avoid potential overflow in main 2021-03-16 16:37:05 +08:00
hv Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
include merge bpf_get_netns_cookie from f318903c0bf42448b4c884732df2bbb0ef7a2284. 2021-03-16 16:43:59 +08:00
io_uring tools/io_uring: fix compile breakage 2021-03-16 16:37:47 +08:00
kvm/kvm_stat Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
laptop Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
leds Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
lib libbpf: Fix BTF dump of pointer-to-array-of-struct 2021-04-12 12:53:30 +08:00
memory-model Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nfsd Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
objtool objtool: Fix ".cold" section suffix check for newer versions of GCC 2021-04-12 12:52:25 +08:00
pci Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pcmcia Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
perf perf beauty: Fix fsconfig generator 2021-05-20 16:07:58 +08:00
power tools: Factor HOSTCC, HOSTLD, HOSTAR definitions 2021-04-12 12:51:42 +08:00
scripts tools: Factor HOSTCC, HOSTLD, HOSTAR definitions 2021-04-12 12:51:42 +08:00
spi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
testing selftests/x86: Consolidate and fix get/set_eflags() helpers 2021-07-21 20:42:45 +08:00
thermal/tmon Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
time Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
usb usbip: tools: fix build error for multiple definition 2021-04-12 12:52:52 +08:00
virtio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vm tools/vm: fix cross-compile build 2021-03-16 16:26:57 +08:00
wmi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00