linux-kernel - Re: [PATCH 3/3] Replace for_each_*_bit_from() with for_each_*

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Date:   Mon, 21 Jun 2021 13:17:11 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jean Delvare <jdelvare@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Marc Zyngier <maz@...nel.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Alexey Klimov <aklimov@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, etnaviv@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH 3/3] Replace for_each_*_bit_from() with for_each_*_bit()
 where appropriate

On Fri, Jun 18, 2021 at 12:57:35PM -0700, Yury Norov wrote:
> A couple of kernel functions call for_each_*_bit_from() with start
> bit equal to 0. Replace them with for_each_*_bit().
> 
> No functional changes, but might improve on readability.
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>  arch/x86/kernel/apic/vector.c         | 4 ++--
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 4 ++--
>  drivers/hwmon/ltc2992.c               | 3 +--

This should be three different patches, one per subsystem.

Guenter

>  3 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
> index fb67ed5e7e6a..d099ef226f55 100644
> --- a/arch/x86/kernel/apic/vector.c
> +++ b/arch/x86/kernel/apic/vector.c
> @@ -760,9 +760,9 @@ void __init lapic_update_legacy_vectors(void)
>  
>  void __init lapic_assign_system_vectors(void)
>  {
> -	unsigned int i, vector = 0;
> +	unsigned int i, vector;
>  
> -	for_each_set_bit_from(vector, system_vectors, NR_VECTORS)
> +	for_each_set_bit(vector, system_vectors, NR_VECTORS)
>  		irq_matrix_assign_system(vector_matrix, vector, false);
>  
>  	if (nr_legacy_irqs() > 1)
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index 4102bcea3341..42ce3287d3be 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1032,7 +1032,7 @@ int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m)
>  
>  void etnaviv_gpu_recover_hang(struct etnaviv_gpu *gpu)
>  {
> -	unsigned int i = 0;
> +	unsigned int i;
>  
>  	dev_err(gpu->dev, "recover hung GPU!\n");
>  
> @@ -1045,7 +1045,7 @@ void etnaviv_gpu_recover_hang(struct etnaviv_gpu *gpu)
>  
>  	/* complete all events, the GPU won't do it after the reset */
>  	spin_lock(&gpu->event_spinlock);
> -	for_each_set_bit_from(i, gpu->event_bitmap, ETNA_NR_EVENTS)
> +	for_each_set_bit(i, gpu->event_bitmap, ETNA_NR_EVENTS)
>  		complete(&gpu->event_free);
>  	bitmap_zero(gpu->event_bitmap, ETNA_NR_EVENTS);
>  	spin_unlock(&gpu->event_spinlock);
> diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
> index 2a4bed0ab226..7352d2b3c756 100644
> --- a/drivers/hwmon/ltc2992.c
> +++ b/drivers/hwmon/ltc2992.c
> @@ -248,8 +248,7 @@ static int ltc2992_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask
>  
>  	gpio_status = reg;
>  
> -	gpio_nr = 0;
> -	for_each_set_bit_from(gpio_nr, mask, LTC2992_GPIO_NR) {
> +	for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
>  		if (test_bit(LTC2992_GPIO_BIT(gpio_nr), &gpio_status))
>  			set_bit(gpio_nr, bits);
>  	}