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authorArnd Bergmann <arnd@arndb.de>2020-09-24 12:32:40 +0300
committerArnd Bergmann <arnd@arndb.de>2020-10-30 23:57:07 +0300
commit0774a6ed294b963dc76df2d8342ab86d030759ec (patch)
treeee12b2df3a2a74f576ae42d1487e9a9b37c13e54 /arch/alpha
parent56cc7b8acfb7c763f71c0492fa8da01dca7c1760 (diff)
downloadlinux-0774a6ed294b963dc76df2d8342ab86d030759ec.tar.xz
timekeeping: default GENERIC_CLOCKEVENTS to enabled
Almost all machines use GENERIC_CLOCKEVENTS, so it feels wrong to require each one to select that symbol manually. Instead, enable it whenever CONFIG_LEGACY_TIMER_TICK is disabled as a simplification. It should be possible to select both GENERIC_CLOCKEVENTS and LEGACY_TIMER_TICK from an architecture now and decide at runtime between the two. For the clockevents arch-support.txt file, this means that additional architectures are marked as TODO when they have at least one machine that still uses LEGACY_TIMER_TICK, rather than being marked 'ok' when at least one machine has been converted. This means that both m68k and arm (for riscpc) revert to TODO. At this point, we could just always enable CONFIG_GENERIC_CLOCKEVENTS rather than leaving it off when not needed. I built an m68k defconfig kernel (using gcc-10.1.0) and found that this would add around 5.5KB in kernel image size: text data bss dec hex filename 3861936 1092236 196656 5150828 4e986c obj-m68k/vmlinux-no-clockevent 3866201 1093832 196184 5156217 4ead79 obj-m68k/vmlinux-clockevent On Arm (MACH_RPC), that difference appears to be twice as large, around 11KB on top of an 6MB vmlinux. Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/Kconfig1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index d6e9fc7a7b19..f0a700946cac 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -27,7 +27,6 @@ config ALPHA
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select AUDIT_ARCH
- select GENERIC_CLOCKEVENTS
select GENERIC_CPU_VULNERABILITIES
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER