linux-kernel - Re: [PATCH] Revert "dm cache: fix arm link errors with inline"

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Message-ID: <20201112180225.GC934688@ubuntu-m3-large-x86>
Date:   Thu, 12 Nov 2020 11:02:25 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Rob Herring <robherring2@...il.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        clang-built-linux@...glegroups.com, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "dm cache: fix arm link errors with inline"

On Tue, Nov 10, 2020 at 06:41:40PM -0800, 'Nick Desaulniers' via Clang Built Linux wrote:
> This reverts commit 43aeaa29573924df76f44eda2bbd94ca36e407b5.
> 
> Since
> commit 0bddd227f3dc ("Documentation: update for gcc 4.9 requirement")
> the minimum supported version of GCC is gcc-4.9. It's now safe to remove
> this code.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/427
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  drivers/md/dm-cache-target.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
> index 9644424591da..4bc453f5bbaa 100644
> --- a/drivers/md/dm-cache-target.c
> +++ b/drivers/md/dm-cache-target.c
> @@ -712,10 +712,6 @@ static bool block_size_is_power_of_two(struct cache *cache)
>  	return cache->sectors_per_block_shift >= 0;
>  }
>  
> -/* gcc on ARM generates spurious references to __udivdi3 and __umoddi3 */
> -#if defined(CONFIG_ARM) && __GNUC__ == 4 && __GNUC_MINOR__ <= 6
> -__always_inline
> -#endif
>  static dm_block_t block_div(dm_block_t b, uint32_t n)
>  {
>  	do_div(b, n);
> -- 
> 2.29.2.222.g5d2a92d10f8-goog
>