Re: [patch 02/19] sh: Get rid of nmi_count()

John Paul Adrian Glaubitz
2021-01-01T14:28:55Z

Hello Thomas!

On 11/13/20 3:02 PM, Thomas Gleixner wrote:
> nmi_count() is a historical leftover and SH is the only user. Replace it
> with regular per cpu accessors.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Cc: Rich Felker <dalias@libc.org>
> Cc: linux-sh@vger.kernel.org
> ---
> arch/sh/kernel/irq.c | 2 +-
> arch/sh/kernel/traps.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> --- a/arch/sh/kernel/irq.c
> +++ b/arch/sh/kernel/irq.c
> @@ -44,7 +44,7 @@ int arch_show_interrupts(struct seq_file
>
> seq_printf(p, "%*s: ", prec, "NMI");
> for_each_online_cpu(j)
> - seq_printf(p, "%10u ", nmi_count(j));
> + seq_printf(p, "%10u ", per_cpu(irq_stat.__nmi_count, j);
> seq_printf(p, " Non-maskable interrupts\n");
>
> seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
> --- a/arch/sh/kernel/traps.c
> +++ b/arch/sh/kernel/traps.c
> @@ -186,7 +186,7 @@ BUILD_TRAP_HANDLER(nmi)
> arch_ftrace_nmi_enter();
>
> nmi_enter();
> - nmi_count(cpu)++;
> + this_cpu_inc(irq_stat.__nmi_count);
>
> switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
> case NOTIFY_OK:
>

Just booted my SH7785LCR board with a kernel based on Linus' latest tree
and can confirm that this change does not cause any regressions.

Adrian

--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaubitz@debian.org
`. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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