linux-kernel - Re: [PATCH] ia64: Fix build error due to switch case label appearing next to declaration

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Message-ID: <20230117193109.5650fd6f@nz>
Date:   Tue, 17 Jan 2023 19:31:09 +0000
From:   Sergei Trofimovich <slyich@...il.com>
To:     James Morse <james.morse@....com>
Cc:     linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
        matoro <matoro_mailinglist_kernel@...oro.tk>,
        Émeric Maschino <emeric.maschino@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ia64: Fix build error due to switch case label
 appearing next to declaration

On Tue, 17 Jan 2023 15:16:32 +0000
James Morse <james.morse@....com> wrote:

> Since commit aa06a9bd8533 ("ia64: fix clock_getres(CLOCK_MONOTONIC) to
> report ITC frequency"), gcc 10.1.0 fails to build ia64 with the gnomic:
> | ../arch/ia64/kernel/sys_ia64.c: In function 'ia64_clock_getres':
> | ../arch/ia64/kernel/sys_ia64.c:189:3: error: a label can only be part of a statement and a declaration is not a statement
> |   189 |   s64 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
> 
> This line appears immediately after a case label in a switch.
> 
> Move the declarations out of the case, to the top of the function.
> 
> Fixes: aa06a9bd8533 ("ia64: fix clock_getres(CLOCK_MONOTONIC) to report ITC frequency")
> Signed-off-by: James Morse <james.morse@....com>

Out of curiosity what compiler version behaves like that? I think I and
matoro build-/run-tested it on gcc-12 and maybe gcc-11.

Thank you!

Reviewed-by: Sergei Trofimovich <slyich@...il.com>

> ---
> Found when build testing another series.
> I've only build tested this.
> 
>  arch/ia64/kernel/sys_ia64.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c
> index f6a502e8f02c..6e948d015332 100644
> --- a/arch/ia64/kernel/sys_ia64.c
> +++ b/arch/ia64/kernel/sys_ia64.c
> @@ -170,6 +170,9 @@ ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, u
>  asmlinkage long
>  ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *tp)
>  {
> +	struct timespec64 rtn_tp;
> +	s64 tick_ns;
> +
>  	/*
>  	 * ia64's clock_gettime() syscall is implemented as a vdso call
>  	 * fsys_clock_gettime(). Currently it handles only
> @@ -185,8 +188,8 @@ ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *
>  	switch (which_clock) {
>  	case CLOCK_REALTIME:
>  	case CLOCK_MONOTONIC:
> -		s64 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
> -		struct timespec64 rtn_tp = ns_to_timespec64(tick_ns);
> +		tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
> +		rtn_tp = ns_to_timespec64(tick_ns);
>  		return put_timespec64(&rtn_tp, tp);
>  	}
>  
> -- 
> 2.30.2
> 


-- 

  Sergei