Daniel Borkmann 7005cade1b bpf, arm64: use separate register for state in stxr ... Will reported that in BPF_XADD we must use a different register in stxr instruction for the status flag due to otherwise CONSTRAINED UNPREDICTABLE behavior per architecture. Reference manual says [1]: If s == t, then one of the following behaviors must occur: * The instruction is UNDEFINED. * The instruction executes as a NOP. * The instruction performs the store to the specified address, but the value stored is UNKNOWN. Thus, use a different temporary register for the status flag to fix it. Disassembly extract from test 226/STX_XADD_DW from test_bpf.ko: [...] 0000003c: c85f7d4b ldxr x11, [x10] 00000040: 8b07016b add x11, x11, x7 00000044: c80c7d4b stxr w12, x11, [x10] 00000048: 35ffffac cbnz w12, 0x0000003c [...] [1] https://static.docs.arm.com/ddi0487/b/DDI0487B_a_armv8_arm.pdf, p.6132 Fixes: 85f68fe898 ("bpf, arm64: implement jiting of BPF_XADD") Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-06-07 15:27:20 -04:00
..
boot	arm64: dts: hikey: Fix WiFi support	2017-05-23 14:18:10 +02:00
configs	arm64: defconfig: enable options needed for QCom DB410c board	2017-05-19 00:01:37 -07:00
crypto	Revert "crypto: arm64/sha - Add constant operand modifier to ASM_EXPORT"	2017-04-24 16:09:50 +08:00
include	ARM64/ACPI: Fix BAD_MADT_GICC_ENTRY() macro implementation	2017-06-02 15:13:52 +01:00
kernel	ARM64: PCI: Fix struct acpi_pci_root_ops allocation failure path	2017-05-25 16:52:58 +01:00
kvm	arm64: KVM: Do not use stack-protector to compile EL2 code	2017-05-15 11:31:16 +02:00
lib	arm64: switch to RAW_COPY_USER	2017-03-28 18:23:24 -04:00
mm	IOMMU Updates for Linux v4.12	2017-05-09 15:15:47 -07:00
net	bpf, arm64: use separate register for state in stxr	2017-06-07 15:27:20 -04:00
xen	xen/privcmd: Add IOCTL_PRIVCMD_DM_OP	2017-02-14 15:13:43 -05:00
Kconfig	arm64 updates for 4.12:	2017-05-05 12:11:37 -07:00
Kconfig.debug	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
Kconfig.platforms	mvebu arm64 for 4.12	2017-05-10 15:36:43 +02:00
Makefile	Kbuild misc updates for 4.12	2017-05-10 20:41:43 -07:00