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kernel-49/arch/mips/include/asm/compiler.h
Greg Kroah-Hartman 20108e7a7c Merge 4.9.185 into android-4.9
Changes in 4.9.185
	tracing: Silence GCC 9 array bounds warning
	gcc-9: silence 'address-of-packed-member' warning
	scsi: ufs: Avoid runtime suspend possibly being blocked forever
	usb: chipidea: udc: workaround for endpoint conflict issue
	IB/hfi1: Silence txreq allocation warnings
	Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD
	apparmor: enforce nullbyte at end of tag string
	ARC: fix build warnings with !CONFIG_KPROBES
	parport: Fix mem leak in parport_register_dev_model
	parisc: Fix compiler warnings in float emulation code
	IB/rdmavt: Fix alloc_qpn() WARN_ON()
	IB/hfi1: Insure freeze_work work_struct is canceled on shutdown
	IB/{qib, hfi1, rdmavt}: Correct ibv_devinfo max_mr value
	MIPS: uprobes: remove set but not used variable 'epc'
	net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0
	net: hns: Fix loopback test failed at copper ports
	sparc: perf: fix updated event period in response to PERF_EVENT_IOC_PERIOD
	net: ethernet: mediatek: Use hw_feature to judge if HWLRO is supported
	net: ethernet: mediatek: Use NET_IP_ALIGN to judge if HW RX_2BYTE_OFFSET is enabled
	drm/arm/hdlcd: Allow a bit of clock tolerance
	scripts/checkstack.pl: Fix arm64 wrong or unknown architecture
	scsi: ufs: Check that space was properly alloced in copy_query_response
	s390/qeth: fix VLAN attribute in bridge_hostnotify udev event
	hwmon: (pmbus/core) Treat parameters as paged if on multiple pages
	nvme: Fix u32 overflow in the number of namespace list calculation
	btrfs: start readahead also in seed devices
	can: flexcan: fix timeout when set small bitrate
	can: purge socket error queue on sock destruct
	powerpc/bpf: use unsigned division instruction for 64-bit operations
	ARM: imx: cpuidle-imx6sx: Restrict the SW2ISO increase to i.MX6SX
	Bluetooth: Align minimum encryption key size for LE and BR/EDR connections
	Bluetooth: Fix regression with minimum encryption key size alignment
	cfg80211: fix memory leak of wiphy device name
	mac80211: drop robust management frames from unknown TA
	mac80211: Do not use stack memory with scatterlist for GMAC
	IB/hfi1: Avoid hardlockup with flushlist_lock
	perf ui helpline: Use strlcpy() as a shorter form of strncpy() + explicit set nul
	perf help: Remove needless use of strncpy()
	perf header: Fix unchecked usage of strncpy()
	9p/rdma: do not disconnect on down_interruptible EAGAIN
	9p: acl: fix uninitialized iattr access
	9p/rdma: remove useless check in cm_event_handler
	9p: p9dirent_read: check network-provided name length
	net/9p: include trans_common.h to fix missing prototype warning.
	fs/proc/array.c: allow reporting eip/esp for all coredumping threads
	fs/binfmt_flat.c: make load_flat_shared_library() work
	mm/page_idle.c: fix oops because end_pfn is larger than max_pfn
	scsi: vmw_pscsi: Fix use-after-free in pvscsi_queue_lck()
	x86/speculation: Allow guests to use SSBD even if host does not
	NFS/flexfiles: Use the correct TCP timeout for flexfiles I/O
	cpu/speculation: Warn on unsupported mitigations= parameter
	af_packet: Block execution of tasks waiting for transmit to complete in AF_PACKET
	net: stmmac: fixed new system time seconds value calculation
	sctp: change to hold sk after auth shkey is created successfully
	tipc: change to use register_pernet_device
	tipc: check msg->req data len in tipc_nl_compat_bearer_disable
	tun: wake up waitqueues after IFF_UP is set
	team: Always enable vlan tx offload
	bonding: Always enable vlan tx offload
	ipv4: Use return value of inet_iif() for __raw_v4_lookup in the while loop
	bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro
	bpf: udp: ipv6: Avoid running reuseport's bpf_prog from __udp6_lib_err
	tipc: pass tunnel dev as NULL to udp_tunnel(6)_xmit_skb
	Bluetooth: Fix faulty expression for minimum encryption key size check
	ASoC : cs4265 : readable register too low
	ASoC: soc-pcm: BE dai needs prepare when pause release after resume
	spi: bitbang: Fix NULL pointer dereference in spi_unregister_master
	drm/mediatek: fix unbind functions
	ASoC: max98090: remove 24-bit format support if RJ is 0
	usb: gadget: fusb300_udc: Fix memory leak of fusb300->ep[i]
	usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC
	scsi: hpsa: correct ioaccel2 chaining
	scripts/decode_stacktrace.sh: prefix addr2line with $CROSS_COMPILE
	mm/mlock.c: change count_mm_mlocked_page_nr return type
	MIPS: math-emu: do not use bools for arithmetic
	MIPS: netlogic: xlr: Remove erroneous check in nlm_fmn_send()
	mfd: omap-usb-tll: Fix register offsets
	ARC: fix allnoconfig build warning
	bug.h: work around GCC PR82365 in BUG()
	ARC: handle gcc generated __builtin_trap for older compiler
	clk: sunxi: fix uninitialized access
	KVM: x86: degrade WARN to pr_warn_ratelimited
	drm/i915/dmc: protect against reading random memory
	MIPS: Workaround GCC __builtin_unreachable reordering bug
	ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME
	crypto: user - prevent operating on larval algorithms
	ALSA: seq: fix incorrect order of dest_client/dest_ports arguments
	ALSA: firewire-lib/fireworks: fix miss detection of received MIDI messages
	ALSA: line6: Fix write on zero-sized buffer
	ALSA: usb-audio: fix sign unintended sign extension on left shifts
	lib/mpi: Fix karactx leak in mpi_powm
	drm/imx: notify drm core before sending event during crtc disable
	drm/imx: only send event on crtc disable if kept disabled
	btrfs: Ensure replaced device doesn't have pending chunk allocation
	tty: rocket: fix incorrect forward declaration of 'rp_init()'
	arm64, vdso: Define vdso_{start,end} as array
	KVM: LAPIC: Fix pending interrupt in IRR blocked by software disable LAPIC
	IB/hfi1: Close PSM sdma_progress sleep window
	MIPS: Add missing EHB in mtc0 -> mfc0 sequence.
	dmaengine: imx-sdma: remove BD_INTR for channel0
	arm64: kaslr: keep modules inside module region when KASAN is enabled
	Linux 4.9.185

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
2019-07-15 18:26:14 +03:00

81 lines
3.0 KiB
C

/*
* Copyright (C) 2004, 2007 Maciej W. Rozycki
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_COMPILER_H
#define _ASM_COMPILER_H
/*
* With GCC 4.5 onwards we can use __builtin_unreachable to indicate to the
* compiler that a particular code path will never be hit. This allows it to be
* optimised out of the generated binary.
*
* Unfortunately at least GCC 4.6.3 through 7.3.0 inclusive suffer from a bug
* that can lead to instructions from beyond an unreachable statement being
* incorrectly reordered into earlier delay slots if the unreachable statement
* is the only content of a case in a switch statement. This can lead to
* seemingly random behaviour, such as invalid memory accesses from incorrectly
* reordered loads or stores. See this potential GCC fix for details:
*
* https://gcc.gnu.org/ml/gcc-patches/2015-09/msg00360.html
*
* It is unclear whether GCC 8 onwards suffer from the same issue - nothing
* relevant is mentioned in GCC 8 release notes and nothing obviously relevant
* stands out in GCC commit logs, but these newer GCC versions generate very
* different code for the testcase which doesn't exhibit the bug.
*
* GCC also handles stack allocation suboptimally when calling noreturn
* functions or calling __builtin_unreachable():
*
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
*
* We work around both of these issues by placing a volatile asm statement,
* which GCC is prevented from reordering past, prior to __builtin_unreachable
* calls.
*
* The .insn statement is required to ensure that any branches to the
* statement, which sadly must be kept due to the asm statement, are known to
* be branches to code and satisfy linker requirements for microMIPS kernels.
*/
#undef barrier_before_unreachable
#define barrier_before_unreachable() asm volatile(".insn")
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
#define GCC_IMM_ASM() "n"
#define GCC_REG_ACCUM "$0"
#else
#define GCC_IMM_ASM() "rn"
#define GCC_REG_ACCUM "accum"
#endif
#ifdef CONFIG_CPU_MIPSR6
/* All MIPS R6 toolchains support the ZC constrain */
#define GCC_OFF_SMALL_ASM() "ZC"
#else
#ifndef CONFIG_CPU_MICROMIPS
#define GCC_OFF_SMALL_ASM() "R"
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
#define GCC_OFF_SMALL_ASM() "ZC"
#else
#error "microMIPS compilation unsupported with GCC older than 4.9"
#endif /* CONFIG_CPU_MICROMIPS */
#endif /* CONFIG_CPU_MIPSR6 */
#ifdef CONFIG_CPU_MIPSR6
#define MIPS_ISA_LEVEL "mips64r6"
#define MIPS_ISA_ARCH_LEVEL MIPS_ISA_LEVEL
#define MIPS_ISA_LEVEL_RAW mips64r6
#define MIPS_ISA_ARCH_LEVEL_RAW MIPS_ISA_LEVEL_RAW
#else
/* MIPS64 is a superset of MIPS32 */
#define MIPS_ISA_LEVEL "mips64r2"
#define MIPS_ISA_ARCH_LEVEL "arch=r4000"
#define MIPS_ISA_LEVEL_RAW mips64r2
#define MIPS_ISA_ARCH_LEVEL_RAW MIPS_ISA_LEVEL_RAW
#endif /* CONFIG_CPU_MIPSR6 */
#endif /* _ASM_COMPILER_H */