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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a6036a41bf
The difference in most compilers between `-O3` and `-O2` is mostly down to whether loops with statically determinable trip counts are fully unrolled vs unrolled to a multiple of SIMD width. This patch is effectively a revert of commit15f5db60a1("kbuild,arc: add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 for ARC") without re-adding ARCH_CFLAGS Ever since commitcfdbc2e16e("ARC: Build system: Makefiles, Kconfig, Linker script") ARC has been built with -O3, though the reason for doing so was not specified in inline comments or the commit message. This commit does not re-add -O3 to arch/arc/Makefile. Folks looking to experiment with `-O3` (or any compiler flag for that matter) may pass them along to the command line invocation of make: $ make KCFLAGS=-O3 Code that looks to re-add an explicit Kconfig option for `-O3` should provide: 1. A rigorous and reproducible performance profile of a reasonable userspace workload that demonstrates a hot loop in the kernel that would benefit from `-O3` over `-O2`. 2. Disassembly of said loop body before and after. 3. Provides stats on terms of increase in file size. Link: https://lore.kernel.org/linux-kbuild/CA+55aFz2sNBbZyg-_i8_Ldr2e8o9dfvdSfHHuRzVtP2VMAUWPg@mail.gmail.com/ Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
102 lines
2.5 KiB
Plaintext
102 lines
2.5 KiB
Plaintext
# CONFIG_LOCALVERSION_AUTO is not set
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# CONFIG_CROSS_MEMORY_ATTACH is not set
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CONFIG_HIGH_RES_TIMERS=y
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CONFIG_IKCONFIG=y
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CONFIG_IKCONFIG_PROC=y
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CONFIG_BLK_DEV_INITRD=y
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CONFIG_EMBEDDED=y
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CONFIG_PERF_EVENTS=y
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# CONFIG_VM_EVENT_COUNTERS is not set
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# CONFIG_SLUB_DEBUG is not set
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# CONFIG_COMPAT_BRK is not set
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CONFIG_PARTITION_ADVANCED=y
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CONFIG_ARC_PLAT_AXS10X=y
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CONFIG_AXS103=y
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CONFIG_ISA_ARCV2=y
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CONFIG_SMP=y
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# CONFIG_ARC_TIMERS_64BIT is not set
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CONFIG_ARC_BUILTIN_DTB_NAME="vdk_hs38_smp"
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CONFIG_PREEMPT=y
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CONFIG_NET=y
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CONFIG_PACKET=y
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CONFIG_UNIX=y
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CONFIG_NET_KEY=y
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CONFIG_INET=y
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CONFIG_IP_PNP=y
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CONFIG_IP_PNP_DHCP=y
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CONFIG_IP_PNP_BOOTP=y
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CONFIG_IP_PNP_RARP=y
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# CONFIG_IPV6 is not set
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CONFIG_DEVTMPFS=y
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CONFIG_DEVTMPFS_MOUNT=y
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# CONFIG_STANDALONE is not set
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# CONFIG_PREVENT_FIRMWARE_BUILD is not set
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CONFIG_MTD=y
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CONFIG_MTD_CMDLINE_PARTS=y
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CONFIG_MTD_BLOCK=y
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CONFIG_MTD_SLRAM=y
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CONFIG_BLK_DEV_RAM=y
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CONFIG_SCSI=y
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CONFIG_BLK_DEV_SD=y
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CONFIG_NETDEVICES=y
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# CONFIG_NET_VENDOR_ARC is not set
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# CONFIG_NET_VENDOR_BROADCOM is not set
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# CONFIG_NET_VENDOR_INTEL is not set
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# CONFIG_NET_VENDOR_MARVELL is not set
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# CONFIG_NET_VENDOR_MICREL is not set
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# CONFIG_NET_VENDOR_NATSEMI is not set
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# CONFIG_NET_VENDOR_SEEQ is not set
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CONFIG_STMMAC_ETH=y
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# CONFIG_NET_VENDOR_VIA is not set
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# CONFIG_NET_VENDOR_WIZNET is not set
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CONFIG_NATIONAL_PHY=y
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CONFIG_MOUSE_PS2_TOUCHKIT=y
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CONFIG_SERIO_ARC_PS2=y
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# CONFIG_LEGACY_PTYS is not set
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CONFIG_SERIAL_8250=y
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CONFIG_SERIAL_8250_CONSOLE=y
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CONFIG_SERIAL_8250_DW=y
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CONFIG_SERIAL_OF_PLATFORM=y
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# CONFIG_HW_RANDOM is not set
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# CONFIG_HWMON is not set
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CONFIG_DRM=y
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CONFIG_DRM_ARCPGU=y
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CONFIG_FRAMEBUFFER_CONSOLE=y
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CONFIG_LOGO=y
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# CONFIG_LOGO_LINUX_MONO is not set
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# CONFIG_LOGO_LINUX_VGA16 is not set
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# CONFIG_LOGO_LINUX_CLUT224 is not set
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CONFIG_USB=y
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CONFIG_USB_EHCI_HCD=y
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# CONFIG_USB_EHCI_TT_NEWSCHED is not set
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CONFIG_USB_EHCI_HCD_PLATFORM=y
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CONFIG_USB_OHCI_HCD=y
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CONFIG_USB_OHCI_HCD_PLATFORM=y
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CONFIG_USB_STORAGE=y
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CONFIG_USB_SERIAL=y
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CONFIG_MMC=y
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CONFIG_MMC_SDHCI=y
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CONFIG_MMC_SDHCI_PLTFM=y
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CONFIG_MMC_DW=y
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CONFIG_UIO=y
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CONFIG_UIO_PDRV_GENIRQ=y
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# CONFIG_IOMMU_SUPPORT is not set
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CONFIG_EXT3_FS=y
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CONFIG_MSDOS_FS=y
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CONFIG_VFAT_FS=y
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CONFIG_NTFS_FS=y
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CONFIG_TMPFS=y
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CONFIG_JFFS2_FS=y
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CONFIG_NFS_FS=y
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CONFIG_NFS_V3_ACL=y
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CONFIG_NLS_CODEPAGE_437=y
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CONFIG_NLS_ISO8859_1=y
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# CONFIG_ENABLE_MUST_CHECK is not set
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CONFIG_STRIP_ASM_SYMS=y
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CONFIG_DEBUG_SHIRQ=y
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CONFIG_SOFTLOCKUP_DETECTOR=y
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CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=10
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# CONFIG_SCHED_DEBUG is not set
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# CONFIG_DEBUG_PREEMPT is not set
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# CONFIG_FTRACE is not set
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