linux-kernel - Re: [PATCH 1/2] cxl: Use the bitmap API to allocate bitmaps

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Message-ID: <44d580dab2836bbb8679067b25c8702447c498e2.camel@linux.ibm.com>
Date:   Wed, 13 Jul 2022 02:42:57 +1000
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] cxl: Use the bitmap API to allocate bitmaps

On Mon, 2022-07-11 at 21:14 +0200, Christophe JAILLET wrote:
> Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.
> 
> It is less verbose and it improves the semantic.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Thanks!

Acked-by: Andrew Donnellan <ajd@...ux.ibm.com>

> ---
>  drivers/misc/cxl/context.c | 2 +-
>  drivers/misc/cxl/guest.c   | 2 +-
>  drivers/misc/cxl/irq.c     | 3 +--
>  drivers/misc/cxl/of.c      | 5 ++---
>  4 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
> index e627b4056623..acaa44809c58 100644
> --- a/drivers/misc/cxl/context.c
> +++ b/drivers/misc/cxl/context.c
> @@ -331,7 +331,7 @@ static void reclaim_ctx(struct rcu_head *rcu)
>                 __free_page(ctx->ff_page);
>         ctx->sstp = NULL;
>  
> -       kfree(ctx->irq_bitmap);
> +       bitmap_free(ctx->irq_bitmap);
>  
>         /* Drop ref to the afu device taken during cxl_context_init
> */
>         cxl_afu_put(ctx->afu);
> diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
> index 3321c014913c..375f692ae9d6 100644
> --- a/drivers/misc/cxl/guest.c
> +++ b/drivers/misc/cxl/guest.c
> @@ -1053,7 +1053,7 @@ static void free_adapter(struct cxl *adapter)
>                 if (adapter->guest->irq_avail) {
>                         for (i = 0; i < adapter->guest->irq_nranges;
> i++) {
>                                 cur = &adapter->guest->irq_avail[i];
> -                               kfree(cur->bitmap);
> +                               bitmap_free(cur->bitmap);
>                         }
>                         kfree(adapter->guest->irq_avail);
>                 }
> diff --git a/drivers/misc/cxl/irq.c b/drivers/misc/cxl/irq.c
> index 5f0e2dcebb34..0ce91d99aead 100644
> --- a/drivers/misc/cxl/irq.c
> +++ b/drivers/misc/cxl/irq.c
> @@ -319,8 +319,7 @@ int afu_allocate_irqs(struct cxl_context *ctx,
> u32 count)
>         }
>  
>         ctx->irq_count = count;
> -       ctx->irq_bitmap = kcalloc(BITS_TO_LONGS(count),
> -                                 sizeof(*ctx->irq_bitmap),
> GFP_KERNEL);
> +       ctx->irq_bitmap = bitmap_zalloc(count, GFP_KERNEL);
>         if (!ctx->irq_bitmap)
>                 goto out;
>  
> diff --git a/drivers/misc/cxl/of.c b/drivers/misc/cxl/of.c
> index 1cfecba42d01..25ce725035e7 100644
> --- a/drivers/misc/cxl/of.c
> +++ b/drivers/misc/cxl/of.c
> @@ -308,8 +308,7 @@ static int read_adapter_irq_config(struct cxl
> *adapter, struct device_node *np)
>                 cur = &adapter->guest->irq_avail[i];
>                 cur->offset = be32_to_cpu(ranges[i * 2]);
>                 cur->range  = be32_to_cpu(ranges[i * 2 + 1]);
> -               cur->bitmap = kcalloc(BITS_TO_LONGS(cur->range),
> -                               sizeof(*cur->bitmap), GFP_KERNEL);
> +               cur->bitmap = bitmap_zalloc(cur->range, GFP_KERNEL);
>                 if (cur->bitmap == NULL)
>                         goto err;
>                 if (cur->offset < adapter->guest->irq_base_offset)
> @@ -326,7 +325,7 @@ static int read_adapter_irq_config(struct cxl
> *adapter, struct device_node *np)
>  err:
>         for (i--; i >= 0; i--) {
>                 cur = &adapter->guest->irq_avail[i];
> -               kfree(cur->bitmap);
> +               bitmap_free(cur->bitmap);
>         }
>         kfree(adapter->guest->irq_avail);
>         adapter->guest->irq_avail = NULL;