linux-kernel - Re: [PATCH] arm64: fix pmem interface definition

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Date:   Thu, 10 Aug 2017 17:33:17 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: fix pmem interface definition

On 10/08/17 15:52, Arnd Bergmann wrote:
> Defining the two functions as 'static inline' and exporting them
> leads to the interesting case where we can use the interface
> from loadable modules, but not from built-in drivers, as shown
> in this link failure:
> 
> vers/nvdimm/claim.o: In function `nsio_rw_bytes':
> claim.c:(.text+0x1b8): undefined reference to `arch_invalidate_pmem'
> drivers/nvdimm/pmem.o: In function `pmem_dax_flush':
> pmem.c:(.text+0x11c): undefined reference to `arch_wb_cache_pmem'
> drivers/nvdimm/pmem.o: In function `pmem_make_request':
> pmem.c:(.text+0x5a4): undefined reference to `arch_invalidate_pmem'
> pmem.c:(.text+0x650): undefined reference to `arch_invalidate_pmem'
> pmem.c:(.text+0x6d4): undefined reference to `arch_invalidate_pmem'
> 
> This removes the bogus 'static inline'.

Oops, yes, this was clearly a silly copy-paste error on my part.

Acked-by: Robin Murphy <robin.murphy@....com>

> Fixes: d50e071fdaa3 ("arm64: Implement pmem API support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm64/mm/flush.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
> index 280f90ff33a2..e36ed5087b5c 100644
> --- a/arch/arm64/mm/flush.c
> +++ b/arch/arm64/mm/flush.c
> @@ -85,7 +85,7 @@ EXPORT_SYMBOL(flush_dcache_page);
>  EXPORT_SYMBOL(flush_icache_range);
>  
>  #ifdef CONFIG_ARCH_HAS_PMEM_API
> -static inline void arch_wb_cache_pmem(void *addr, size_t size)
> +void arch_wb_cache_pmem(void *addr, size_t size)
>  {
>  	/* Ensure order against any prior non-cacheable writes */
>  	dmb(osh);
> @@ -93,7 +93,7 @@ static inline void arch_wb_cache_pmem(void *addr, size_t size)
>  }
>  EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
>  
> -static inline void arch_invalidate_pmem(void *addr, size_t size)
> +void arch_invalidate_pmem(void *addr, size_t size)
>  {
>  	__inval_dcache_area(addr, size);
>  }
>