linux-kernel - Re: [PATCH 1/1] nios2: implement flush_dcache_mmap

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Date:   Tue, 11 Apr 2017 23:50:07 +0800
From:   Ley Foon Tan <ley.foon.tan@...el.com>
To:     Julien Beraud <julien.beraud@...ctracom.orolia.com>,
        linux-kernel@...r.kernel.org, nios2-dev@...ts.rocketboards.org
Subject: Re: [PATCH 1/1] nios2: implement flush_dcache_mmap_lock/unlock

On Mon, 2017-04-03 at 13:11 +0200, Julien Beraud wrote:
> Use spin_lock/unlock_irq instead of doing nothing. This fixes
> corruptions
> of the vma_interval_tree causing the kernel to be stuck in an
> infinite loop in vma_interval_tree_foreach.
> 
> Signed-off-by: Julien Beraud <julien.beraud@...ctracom.orolia.com>
> ---
>  arch/nios2/include/asm/cacheflush.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/nios2/include/asm/cacheflush.h
> b/arch/nios2/include/asm/cacheflush.h
> index 52abba973dc2..55e383c173f7 100644
> --- a/arch/nios2/include/asm/cacheflush.h
> +++ b/arch/nios2/include/asm/cacheflush.h
> @@ -46,7 +46,9 @@ extern void copy_from_user_page(struct
> vm_area_struct *vma, struct page *page,
>  extern void flush_dcache_range(unsigned long start, unsigned long
> end);
>  extern void invalidate_dcache_range(unsigned long start, unsigned
> long end);
> 
> -#define flush_dcache_mmap_lock(mapping)                do { } while
> (0)
> -#define flush_dcache_mmap_unlock(mapping)      do { } while (0)
> +#define flush_dcache_mmap_lock(mapping) \
> +       spin_lock_irq(&(mapping)->tree_lock)
> +#define flush_dcache_mmap_unlock(mapping) \
> +       spin_unlock_irq(&(mapping)->tree_lock)
> 
>  #endif /* _ASM_NIOS2_CACHEFLUSH_H */
> --
> 2.11.0
> 
Acked-by: Ley Foon Tan <ley.foon.tan@...el.com>

Regards
Ley Foon