kernel/arch/arc/Makefile, branch linux-4.15.y

arc: remove redundant UTS_MACHINE define in arch/arc/Makefile

2017-10-04T03:36:49Z

The top-level Makefile sets the default of UTS_MACHINE to $(ARCH). If ARCH and UTS_MACHINE match, arch/$(ARCH)/Makefile need not specify UTS_MACHINE explicitly. Signed-off-by: Masahiro Yamada Signed-off-by: Vineet Gupta

ARC: [plat-hsdk] initial port for HSDK board

2017-09-01T18:26:28Z

This initial port adds support of ARC HS Development Kit board with some basic features such serial port, USB, SD/MMC and Ethernet. Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and heavily use IO Coherency for speeding-up DMA-aware peripherals. Note as opposed to other ARC boards we link Linux kernel to 0x9000_0000 intentionally because cores 1 and 3 configured with DCCM situated at our more usual link base 0x8000_0000. We still can use memory region starting at 0x8000_0000 as we reallocate DCCM in our platform code. Note that PAE remapping for DMA clients does not work due to an RTL bug, so CREG_PAE register must be programmed to all zeroes, otherwise it will cause problems with DMA to/from peripherals even if PAE40 is not used. Acked-by: Rob Herring Signed-off-by: Alexey Brodkin Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta

ARC: [plat-sim] Include this platform unconditionally

2017-08-04T08:19:47Z

Essentially remove CONFIG_ARC_PLAT_SIM There is no need for any platform specific code, just the board DTS match strings which we can include unconditionally Signed-off-by: Vineet Gupta

arc: Use full path in KBUILD_IMAGE definition

2017-03-20T13:42:20Z

The KBUILD_IMAGE variable is used by the rpm and deb-pkg targets, which expect it to point to the image file in the build directory. The builddeb script has a workaround for architectures which only provide the basename, but let's provide a clean interface for packaging tools. Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Michal Marek Signed-off-by: Masahiro Yamada

Merge tag 'arc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

2016-11-12T00:51:50Z

Pull ARC fixes from Vineet Gupta: - mmap handler for dma ops as generic handler no longer works for us [Alexey] - Fixes for EZChip platform [Noam] - Fix RTC clocksource driver build issue - ARC IRQ handling fixes [Yuriy] - Revert a recent makefile change which doesn't go well with oldish tools out in the wild * tag 'arc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core ARC: IRQ: Do not use hwirq as virq and vice versa ARC: [plat-eznps] set default baud for early console ARC: [plat-eznps] remove IPI clear from SMP operations Revert "ARC: build: retire old toggles" ARC: timer: rtc: implement read loop in "C" vs. inline asm ARC: change return value of userspace cmpxchg assist syscall arc: Implement arch-specific dma_map_ops.mmap ARC: [SMP] avoid overriding present cpumask ARC: Enable PERF_EVENTS in nSIM driven platforms

Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"

2016-11-11T16:45:08Z

Traditionally, we have always had warnings about uninitialized variables enabled, as this is part of -Wall, and generally a good idea [1], but it also always produced false positives, mainly because this is a variation of the halting problem and provably impossible to get right in all cases [2]. Various people have identified cases that are particularly bad for false positives, and in commit e74fc973b6e5 ("Turn off -Wmaybe-uninitialized when building with -Os"), I turned off the warning for any build that was done with CC_OPTIMIZE_FOR_SIZE. This drastically reduced the number of false positive warnings in the default build but unfortunately had the side effect of turning the warning off completely in 'allmodconfig' builds, which in turn led to a lot of warnings (both actual bugs, and remaining false positives) to go in unnoticed. With commit 877417e6ffb9 ("Kbuild: change CC_OPTIMIZE_FOR_SIZE definition") enabled the warning again for allmodconfig builds in v4.7 and in v4.8-rc1, I had finally managed to address all warnings I get in an ARM allmodconfig build and most other maybe-uninitialized warnings for ARM randconfig builds. However, commit 6e8d666e9253 ("Disable "maybe-uninitialized" warning globally") was merged at the same time and disabled it completely for all configurations, because of false-positive warnings on x86 that I had not addressed until then. This caused a lot of actual bugs to get merged into mainline, and I sent several dozen patches for these during the v4.9 development cycle. Most of these are actual bugs, some are for correct code that is safe because it is only called under external constraints that make it impossible to run into the case that gcc sees, and in a few cases gcc is just stupid and finds something that can obviously never happen. I have now done a few thousand randconfig builds on x86 and collected all patches that I needed to address every single warning I got (I can provide the combined patch for the other warnings if anyone is interested), so I hope we can get the warning back and let people catch the actual bugs earlier. This reverts the change to disable the warning completely and for now brings it back at the "make W=1" level, so we can get it merged into mainline without introducing false positives. A follow-up patch enables it on all levels unless some configuration option turns it off because of false-positives. Link: https://rusty.ozlabs.org/?p=232 [1] Link: https://gcc.gnu.org/wiki/Better_Uninitialized_Warnings [2] Signed-off-by: Arnd Bergmann Signed-off-by: Linus Torvalds

Revert "ARC: build: retire old toggles"

2016-11-08T17:23:52Z

This has caused a bunch of build failures at a few sites, with GNU 2015.12 and older as the assembler seems to need -mlock to be able to grok llock/scond instructions for ARC700 builds. different places since the older tools still seem to release of tools which most people are using seem to trip with the -mlock flag not being passed. This reverts commit c3005475889c7c730638f95d13be3360f0b33e98.

ARC: build: retire old toggles

2016-10-28T17:10:27Z

These are really ancient toggles and tools no longer require them to be passed. This paves way for deprecating them in long run. Signed-off-by: Vineet Gupta

ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm

2016-09-30T21:48:22Z

1. detect whether binutils supports the cfi pseudo ops 2. define conditional macros to generate the ops 3. define new ENTRY_CFI/END_CFI to annotate hand asm code. - Needed because we don't want to emit dwarf info in general ENTRY/END used by lowest level trap/exception/interrutp handlers as unwinder gets confused trying to unwind out of them. We want unwinder to instead stop when it hits onfo those routines - These provide minimal start/end cfi ops assuming routine doesn't touch stack memory/regs Signed-off-by: Vineet Gupta

ARC: dw2 unwind: don't force dwarf 2

2016-09-30T21:48:21Z

In .debug_frame based unwinding regime, we used to force -gdwarf-2 since kernel unwinder only claimed to handle dwarf 2. This changed since commit 6d0d506012c93d ("ARC: dw2 unwind: Don't bail for CIE.version != 1") which added some support beyond dwarf 2, atleast to handle CIE != 1 The ill-effect of -gdwarf-2 is that it forces generation of .debug_* sections, which bloats loadable modules .ko files. For the curious, this doesn't affect vmlinx binary since linker script discards .debug_* but same discard is not yet implemented for modules. So it seems we can drop the -gdwarf-2 toggle, which should not be needed anyways given that we now use .eh_frame based unwinding. I've verified using GNU 2016.09-engo10 that the actual unwind info is not different with or w/o this toggle - but the debug_* sections are gone for good. before ----- arc-linux-readelf -S q_proc.ko-unwinding-1-eh_frame-switch | grep debug [15] .debug_info PROGBITS 00000000 000300 00d08d 00 0 0 1 [16] .rela.debug_info RELA 00000000 0162a0 008844 0c I 29 15 4 [17] .debug_abbrev PROGBITS 00000000 00d38d 0005f8 00 0 0 1 [18] .debug_loc PROGBITS 00000000 00d985 000070 00 0 0 1 [19] .rela.debug_loc RELA 00000000 01eae4 0000c0 0c I 29 18 4 [20] .debug_aranges PROGBITS 00000000 00d9f5 000040 00 0 0 1 [21] .rela.debug_arang RELA 00000000 01eba4 000030 0c I 29 20 4 [22] .debug_ranges PROGBITS 00000000 00da35 000018 00 0 0 1 [23] .rela.debug_range RELA 00000000 01ebd4 000030 0c I 29 22 4 [24] .debug_line PROGBITS 00000000 00da4d 000b5b 00 0 0 1 [25] .rela.debug_line RELA 00000000 01ec04 0000cc 0c I 29 24 4 [26] .debug_str PROGBITS 00000000 00e5a8 007831 01 MS 0 0 1 after ---- Signed-off-by: Vineet Gupta