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f81309067f
linux_dsm_epyc7002/arch/arm/include/asm
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Russell King f81309067f ARM: move heavy barrier support out of line 
The existing memory barrier macro causes a significant amount of code
to be inserted inline at every call site.  For example, in
gpio_set_irq_type(), we have this for mb():

c0344c08:       f57ff04e        dsb     st
c0344c0c:       e59f8190        ldr     r8, [pc, #400]  ; c0344da4 <gpio_set_irq_type+0x230>
c0344c10:       e3590004        cmp     r9, #4
c0344c14:       e5983014        ldr     r3, [r8, #20]
c0344c18:       0a000054        beq     c0344d70 <gpio_set_irq_type+0x1fc>
c0344c1c:       e3530000        cmp     r3, #0
c0344c20:       0a000004        beq     c0344c38 <gpio_set_irq_type+0xc4>
c0344c24:       e50b2030        str     r2, [fp, #-48]  ; 0xffffffd0
c0344c28:       e50bc034        str     ip, [fp, #-52]  ; 0xffffffcc
c0344c2c:       e12fff33        blx     r3
c0344c30:       e51bc034        ldr     ip, [fp, #-52]  ; 0xffffffcc
c0344c34:       e51b2030        ldr     r2, [fp, #-48]  ; 0xffffffd0
c0344c38:       e5963004        ldr     r3, [r6, #4]

Moving the outer_cache_sync() call out of line reduces the impact of
the barrier:

c0344968:       f57ff04e        dsb     st
c034496c:       e35a0004        cmp     sl, #4
c0344970:       e50b2030        str     r2, [fp, #-48]  ; 0xffffffd0
c0344974:       0a000044        beq     c0344a8c <gpio_set_irq_type+0x1b8>
c0344978:       ebf363dd        bl      c001d8f4 <arm_heavy_mb>
c034497c:       e5953004        ldr     r3, [r5, #4]

This should reduce the cache footprint of this code.  Overall, this
results in a reduction of around 20K in the kernel size:

    text    data      bss      dec     hex filename
10773970  667392 10369656 21811018 14ccf4a ../build/imx6/vmlinux-old
10754219  667392 10369656 21791267 14c8223 ../build/imx6/vmlinux-new

Another advantage to this approach is that we can finally resolve the
issue of SoCs which have their own memory barrier requirements within
multiplatform kernels (such as OMAP.)  Here, the bus interconnects
need additional handling to ensure that writes become visible in the
correct order (eg, between dma_map() operations, writes to DMA
coherent memory, and MMIO accesses.)

Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-07-25 15:28:05 +01:00
..
hardware ARM: 8366/1: move Dual-Timer SP804 driver to drivers/clocksource 2015-06-02 09:58:18 +01:00
mach ARM: keystone2: rename init_meminfo to pv_fixup 2015-06-01 23:45:56 +01:00
xen arm/xen: Drop duplicate define mfn_to_virt 2015-06-17 16:35:17 +01:00
arch_timer.h clocksource: arch_timer: Fix code to use physical timers when requested 2014-12-04 23:30:26 -08:00
arm-cci.h arm-cci: Get rid of secure transactions for PMU driver 2015-03-27 13:44:35 +00:00
asm-offsets.h
assembler.h ARM: replace BSYM() with badr assembly macro 2015-05-08 17:33:50 +01:00
atomic.h locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() 2014-10-03 06:06:23 +02:00
auxvec.h ARM: 8329/1: miscellaneous vdso infrastructure, preparation 2015-03-27 22:20:45 +00:00
barrier.h ARM: move heavy barrier support out of line 2015-07-25 15:28:05 +01:00
bitops.h arch,arm: Convert smp_mb__*() 2014-04-18 11:40:32 +02:00
bitrev.h ARM: 8287/1: add bitrev.h file to support rbit instruction 2015-01-16 14:06:18 +00:00
bL_switcher.h ARM: bL_switcher: Add query interface to discover CPU affinities 2013-09-23 18:47:31 -04:00
bug.h ARM: Correct BUG() assembly to ensure it is endian-agnostic 2013-10-19 20:46:35 +01:00
bugs.h
cache.h
cacheflush.h ARM: 8380/1: bpf: fix NOMMU build 2015-05-28 00:29:22 +01:00
cachetype.h
checksum.h ARM: fix csum_tcpudp_magic() miscompilation 2013-12-29 12:32:41 +00:00
clkdev.h clk: Add common __clk_get(), __clk_put() implementations 2013-12-04 17:19:44 +01:00
cmpxchg.h ARM: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations 2015-06-02 09:58:20 +01:00
compiler.h ARM: 8300/1: teach __asmeq that r11 == fp and r12 == ip 2015-02-10 10:23:11 +00:00
cp15.h ARM: remove global cr_no_alignment 2014-06-02 09:20:18 +01:00
cpu.h
cpuidle.h ARM: cpuidle: Add a cpuidle ops structure to be used for DT 2015-03-24 10:16:01 +01:00
cputype.h ARM: 8318/1: treat CPU feature register fields as signed quantities 2015-03-28 15:46:15 +00:00
cti.h
dcc.h ARM: tty: Move HVC DCC assembly to arch/arm 2014-05-28 13:33:18 -07:00
delay.h
device.h arm: introduce is_device_dma_coherent 2014-12-04 12:41:50 +00:00
div64.h ARM: 8027/1: fix do_div() bug in big-endian systems 2014-04-22 22:23:57 +01:00
dma-contiguous.h drivers: dma-contiguous: clean source code and prepare for device tree 2013-08-27 09:18:29 +02:00
dma-iommu.h ARM: 8347/1: dma-mapping: fix off-by-one check in arm_setup_iommu_dma_ops 2015-05-03 23:21:55 +01:00
dma-mapping.h ARM: SoC/iommu configuration for 3.19 2014-12-16 14:53:01 -08:00
dma.h remove <asm/scatterlist.h> 2015-05-05 13:35:39 -06:00
domain.h
ecard.h
edac.h EDAC: Cleanup atomic_scrub mess 2015-05-28 15:31:53 +02:00
elf.h Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-04-14 21:03:26 -07:00
entry-macro-multi.S ARM: replace BSYM() with badr assembly macro 2015-05-08 17:33:50 +01:00
exception.h
fb.h
fiq.h
firmware.h ARM: EXYNOS: add exynos_get_boot_addr() helper 2015-06-06 02:17:56 +09:00
fixmap.h arm: use fixmap for text patching when text is RO 2014-10-16 14:38:53 -07:00
flat.h
floppy.h ARM: 7996/1: floppy.h: remove deprecated IRQF_DISABLED 2014-03-12 10:32:29 +00:00
fncpy.h
fpstate.h
ftrace.h ARM: 8158/1: LLVMLinux: use static inline in ARM ftrace.h 2014-09-26 14:40:03 +01:00
futex.h sched/preempt, arm/futex: Disable preemption in UP futex_atomic_op_inuser() explicitly 2015-05-19 08:39:17 +02:00
glue-cache.h ARM: LLVMLinux: Change "extern inline" to "static inline" in glue-cache.h 2014-06-07 11:44:39 -07:00
glue-df.h ARM: 8065/1: remove last use of CONFIG_CPU_ARM710 2014-05-30 01:12:30 +01:00
glue-pf.h
glue-proc.h ARM: 8103/1: save/restore Cortex-A9 CP15 registers on suspend/resume 2014-07-18 12:29:37 +01:00
glue.h
gpio.h ARM: delete old reference to ARM_GPIOLIB_COMPLEX 2014-06-30 21:37:39 +02:00
hardirq.h Merge branch 'devel-stable' into for-next 2013-11-12 10:58:59 +00:00
highmem.h ARM: 8031/2: change fixmap mapping region to support 32 CPUs 2014-04-23 11:09:42 +01:00
hugetlb-3level.h
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hw_breakpoint.h ARM: 7948/1: hw_breakpoint: Add ARMv8 support 2014-02-10 11:48:05 +00:00
hw_irq.h ARM: 8218/1: warn if bad IRQ was scheduled 2014-11-27 16:15:33 +00:00
hwcap.h ARM: 7981/1: add support for AT_HWCAP2 ELF auxv entry 2014-02-25 11:40:48 +00:00
hypervisor.h
ide.h
idmap.h
insn.h ARM: kprobes: enable OPTPROBES for ARM 32 2015-01-13 16:10:17 +00:00
io.h Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00
irq_work.h arm: Tell irq work about self IPI support 2014-09-13 18:38:39 +02:00
irq.h
irqflags.h ARM: 8390/1: irqflags: Get arch_irqs_disabled from asm-generic 2015-06-10 23:52:35 +01:00
jump_label.h jump_label: Allow asm/jump_label.h to be included in assembly 2015-04-09 09:40:23 +02:00
Kbuild remove scatterlist.h generation from arch Kbuild files 2015-05-19 09:14:34 -06:00
kexec.h
kgdb.h ARM: kdgb: use <asm/opcodes.h> for data to be assembled as intruction 2013-10-19 20:46:35 +01:00
kmap_types.h
kprobes.h ARM: optprobes: execute instruction during restoring if possible. 2015-01-14 12:24:52 +00:00
kvm_arm.h arm/arm64: KVM: Implement Stage-2 page aging 2015-03-12 22:34:43 +01:00
kvm_asm.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
kvm_coproc.h
kvm_emulate.h Fairly small update, but there are some interesting new features. 2015-02-13 09:55:09 -08:00
kvm_host.h arm64: KVM: Switch vgic save/restore to alternative_insn 2015-06-12 15:12:08 +01:00
kvm_mmio.h KVM: arm/arm64: rework MMIO abort handling to use KVM MMIO bus 2015-03-30 17:07:19 +01:00
kvm_mmu.h arm64 updates for 4.1: 2015-04-16 13:58:29 -05:00
kvm_psci.h ARM/ARM64: KVM: Make kvm_psci_call() return convention more flexible 2014-04-30 04:18:57 -07:00
limits.h
linkage.h
mach-types.h
mc146818rtc.h
mcpm.h ARM: MCPM: remove residency argument from mcpm_cpu_suspend() 2015-05-06 11:47:10 -04:00
mcs_spinlock.h ARM: 8098/1: mcs lock: implement wfe-based polling for MCS locking 2014-07-18 12:29:35 +01:00
memblock.h ARM: 8025/1: Get rid of meminfo 2014-06-01 01:17:12 +01:00
memory.h ARM: redo TTBR setup code for LPAE 2015-06-01 23:48:19 +01:00
mm-arch-hooks.h mm: new mm hook framework 2015-06-24 17:49:41 -07:00
mmu_context.h ARM: 7790/1: Fix deferred mm switch on VIVT processors 2013-07-26 12:02:09 +01:00
mmu.h ARM: 8329/1: miscellaneous vdso infrastructure, preparation 2015-03-27 22:20:45 +00:00
module.h ARM: 8220/1: allow modules outside of bl range 2015-05-08 10:42:34 +01:00
mpu.h
mtd-xip.h
mutex.h
neon.h ARM: add support for kernel mode NEON 2013-07-08 22:08:51 +01:00
nwflash.h
opcodes-sec.h
opcodes-virt.h
opcodes.h
outercache.h ARM: move heavy barrier support out of line 2015-07-25 15:28:05 +01:00
page-nommu.h
page.h ARM: make vectors page inaccessible from userspace 2013-08-01 14:31:58 +01:00
patch.h ARM: probes: move all probe code to dedicate directory 2015-01-09 09:36:50 +00:00
pci.h PCI: Remove unused pci_dma_burst_advice() 2015-06-08 07:56:43 -05:00
percpu.h ARM: 8174/1: Use global stack register variable for percpu 2014-11-13 23:58:06 +00:00
perf_event.h arm: perf: Fix callchain parse error with kernel tracepoint events 2015-05-27 16:12:05 +01:00
pgalloc.h ARM: 8235/1: Support for the PXN CPU feature on ARMv7 2014-12-03 15:57:45 +00:00
pgtable-2level-hwdef.h ARM: 8235/1: Support for the PXN CPU feature on ARMv7 2014-12-03 15:57:45 +00:00
pgtable-2level-types.h
pgtable-2level.h arm: define __PAGETABLE_PMD_FOLDED for !LPAE 2015-02-11 17:06:04 -08:00
pgtable-3level-hwdef.h ARM: 8235/1: Support for the PXN CPU feature on ARMv7 2014-12-03 15:57:45 +00:00
pgtable-3level-types.h
pgtable-3level.h Fairly small update, but there are some interesting new features. 2015-02-13 09:55:09 -08:00
pgtable-hwdef.h
pgtable-nommu.h mm: make FIRST_USER_ADDRESS unsigned long on all archs 2015-02-11 17:06:03 -08:00
pgtable.h arm: drop L_PTE_FILE and pte_file()-related helpers 2015-02-10 14:30:31 -08:00
pmu.h arm: perf: share arm_pmu_device_probe 2015-05-28 16:54:06 +01:00
probes.h ARM: optprobes: execute instruction during restoring if possible. 2015-01-14 12:24:52 +00:00
proc-fns.h ARM: redo TTBR setup code for LPAE 2015-06-01 23:48:19 +01:00
processor.h arch, locking: Ciao arch_mutex_cpu_relax() 2014-07-17 12:32:47 +02:00
procinfo.h
prom.h of/fdt: move memreserve and dtb memory reservations into core 2014-04-30 00:59:17 -05:00
psci.h arm: Fix compile warning for psci 2014-05-27 15:58:49 +02:00
ptrace.h ARM: 8175/1: Use current_stack_pointer to calculate pt_regs address 2014-11-13 23:58:07 +00:00
setup.h ARM: 8025/1: Get rid of meminfo 2014-06-01 01:17:12 +01:00
shmparam.h
signal.h
smp_plat.h ARM: 8338/1: kexec: Relax SMP validation to improve DT compatibility 2015-04-02 09:59:43 +01:00
smp_scu.h ARM: make it easier to check the CPU part number correctly 2014-07-18 12:29:02 +01:00
smp_twd.h
smp.h Merge branches 'arnd-fixes', 'clk', 'misc', 'v7' and 'fixes' into for-next 2015-06-12 21:18:08 +01:00
sparsemem.h
spinlock_types.h ARM: locks: prefetch the destination word for write prior to strex 2013-09-30 16:42:55 +01:00
spinlock.h arm/spinlock: Replace ACCESS_ONCE with READ_ONCE 2014-12-18 09:54:40 +01:00
stackprotector.h
stacktrace.h ARM: 8070/1: Introduce arm_get_current_stack_frame() 2014-07-18 12:29:11 +01:00
string.h
suspend.h ARM: 8389/1: Add cpu_resume_arm() for firmwares that resume in ARM state 2015-06-12 21:17:17 +01:00
swab.h
switch_to.h ARM: spinlock: use inner-shareable dsb variant prior to sev instruction 2013-08-12 12:25:45 +01:00
sync_bitops.h ARM: 7989/1: Delete asm/system.h 2014-02-25 11:33:37 +00:00
syscall.h ARM: 8152/1: Convert pr_warning to pr_warn 2014-09-26 14:39:53 +01:00
system_info.h ARM: 8355/1: arch: Show the serial number from devicetree in cpuinfo 2015-05-08 10:42:35 +01:00
system_misc.h reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
tcm.h
therm.h
thread_info.h arm: Remove signal translation and exec_domain 2015-04-12 20:58:24 +02:00
thread_notify.h
timex.h ARM: drop <mach/timex.h> for !ARCH_MULTIPLATFORM, too 2013-12-20 17:17:16 +01:00
tlb.h arm: mm: enable HAVE_RCU_TABLE_FREE logic 2014-10-09 22:26:01 -04:00
tlbflush.h ARM: 7855/1: Add check for Cortex-A15 errata 798181 ECO 2013-10-29 11:06:13 +00:00
tls.h ARM: 8178/1: fix set_tls for !CONFIG_KUSER_HELPERS 2014-09-30 16:55:23 +01:00
topology.h sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask() 2015-05-27 15:22:15 +02:00
traps.h
trusted_foundations.h ARM: trusted_foundations: fix compile error on non-SMP 2014-05-23 21:28:11 +02:00
types.h ARM: 7822/1: add workaround for ambiguous C99 stdint.h types 2013-08-25 17:09:46 +01:00
uaccess.h ARM: 8322/1: keep .text and .fixup regions closer together 2015-03-29 23:11:56 +01:00
ucontext.h
unified.h ARM: replace BSYM() with badr assembly macro 2015-05-08 17:33:50 +01:00
unistd.h ARM: wire up getrandom syscall 2014-08-09 14:07:53 +01:00
unwind.h
uprobes.h ARM: add uprobes support 2014-03-18 16:39:40 -04:00
user.h
v7m.h ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines 2013-09-02 13:49:29 +01:00
vdso_datapage.h ARM: 8329/1: miscellaneous vdso infrastructure, preparation 2015-03-27 22:20:45 +00:00
vdso.h ARM: 8329/1: miscellaneous vdso infrastructure, preparation 2015-03-27 22:20:45 +00:00
vfp.h ARM: vfp: Add vfp_disable for problematic platforms 2015-05-20 15:07:00 -07:00
vfpmacros.h
vga.h
virt.h ARM: 7787/1: virt: ensure visibility of __boot_cpu_mode 2013-07-26 12:01:17 +01:00
word-at-a-time.h ARM: 8322/1: keep .text and .fixup regions closer together 2015-03-29 23:11:56 +01:00
xor.h ARM: crypto: add NEON accelerated XOR implementation 2013-07-08 22:09:06 +01:00