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Date: Mon, 12 Oct 2020 15:15:57 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Arnd Bergmann <arnd@...db.de> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Russell King <linux@...linux.org.uk>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Greg Ungerer <gerg@...ux-m68k.org>, Finn Thain <fthain@...egraphics.com.au>, Philip Blundell <philb@....org>, Joshua Thompson <funaho@...ai.org>, Sam Creasey <sammy@...my.net>, "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>, Helge Deller <deller@....de>, Thomas Gleixner <tglx@...utronix.de>, Daniel Lezcano <daniel.lezcano@...aro.org>, John Stultz <john.stultz@...aro.org>, Stephen Boyd <sboyd@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>, Parisc List <linux-parisc@...r.kernel.org>, linux-m68k <linux-m68k@...ts.linux-m68k.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH 12/13] timekeeping: default GENERIC_CLOCKEVENTS to enabled On Thu, Oct 8, 2020 at 5:48 PM Arnd Bergmann <arnd@...db.de> wrote: > 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. > > Signed-off-by: Arnd Bergmann <arnd@...db.de> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org> > arch/m68k/Kconfig.cpu | 1 - Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org> Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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