forked from Minki/linux
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>
61 lines
1.5 KiB
Plaintext
61 lines
1.5 KiB
Plaintext
# CONFIG_LOCALVERSION_AUTO is not set
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# CONFIG_SWAP is not set
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CONFIG_SYSVIPC=y
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CONFIG_POSIX_MQUEUE=y
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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_PREEMPT=y
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CONFIG_IKCONFIG=y
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CONFIG_IKCONFIG_PROC=y
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CONFIG_NAMESPACES=y
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# CONFIG_UTS_NS is not set
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# CONFIG_PID_NS is not set
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CONFIG_BLK_DEV_INITRD=y
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CONFIG_KALLSYMS_ALL=y
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CONFIG_EMBEDDED=y
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CONFIG_PERF_EVENTS=y
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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_ISA_ARCOMPACT=y
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CONFIG_ARC_BUILTIN_DTB_NAME="nsim_700"
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CONFIG_KPROBES=y
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CONFIG_MODULES=y
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# CONFIG_BLK_DEV_BSG is not set
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# CONFIG_COMPACTION is not set
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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_UNIX_DIAG=y
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CONFIG_NET_KEY=y
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CONFIG_INET=y
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# CONFIG_IPV6 is not set
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CONFIG_DEVTMPFS=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_BLK_DEV is not set
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CONFIG_NETDEVICES=y
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# CONFIG_ETHERNET is not set
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# CONFIG_WLAN is not set
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# CONFIG_INPUT_KEYBOARD is not set
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# CONFIG_INPUT_MOUSE is not set
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# CONFIG_SERIO is not set
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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_NR_UARTS=1
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CONFIG_SERIAL_8250_RUNTIME_UARTS=1
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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_HID is not set
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# CONFIG_USB_SUPPORT is not set
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# CONFIG_IOMMU_SUPPORT is not set
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CONFIG_EXT2_FS=y
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CONFIG_EXT2_FS_XATTR=y
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CONFIG_TMPFS=y
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# CONFIG_MISC_FILESYSTEMS is not set
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CONFIG_NFS_FS=y
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# CONFIG_ENABLE_MUST_CHECK is not set
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# CONFIG_DEBUG_PREEMPT is not set
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