linux-kernel - Re: [PATCH] powerpc/pseries/iommu: fix set but not used values

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Date:   Sun, 7 Apr 2019 12:04:10 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Qian Cai <cai@....pw>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org
Cc:     aik@...abs.ru, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/pseries/iommu: fix set but not used values


On 4/7/2019 8:18 AM, Qian Cai wrote:
> The commit b7d6bf4fdd47 ("powerpc/pseries/pci: Remove obsolete SW
> invalidate") left 2 variables unused.
>
> arch/powerpc/platforms/pseries/iommu.c: In function 'tce_build_pSeries':
> arch/powerpc/platforms/pseries/iommu.c:108:17: warning: variable 'tces'
> set but not used [-Wunused-but-set-variable]
>    __be64 *tcep, *tces;
>                   ^~~~
> arch/powerpc/platforms/pseries/iommu.c: In function 'tce_free_pSeries':
> arch/powerpc/platforms/pseries/iommu.c:132:17: warning: variable 'tces'
> set but not used [-Wunused-but-set-variable]
>    __be64 *tcep, *tces;
>                   ^~~~
>
> Also, the commit 68c0449ea16d ("powerpc/pseries/iommu: Use memory@ nodes
> in max RAM address calculation") set "ranges" in
> ddw_memory_hotplug_max() but never use it.
>
> arch/powerpc/platforms/pseries/iommu.c: In function
> 'ddw_memory_hotplug_max':
> arch/powerpc/platforms/pseries/iommu.c:948:7: warning: variable 'ranges'
> set but not used [-Wunused-but-set-variable]
>     int ranges, n_mem_addr_cells, n_mem_size_cells, len;
>         ^~~~~~
>
> Signed-off-by: Qian Cai <cai@....pw>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

Cheers,
-Mukesh

> ---
>   arch/powerpc/platforms/pseries/iommu.c | 13 +++++--------
>   1 file changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> index 36eb1ddbac69..03bbb299320e 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -105,7 +105,7 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index,
>   			      unsigned long attrs)
>   {
>   	u64 proto_tce;
> -	__be64 *tcep, *tces;
> +	__be64 *tcep;
>   	u64 rpn;
>   
>   	proto_tce = TCE_PCI_READ; // Read allowed
> @@ -113,7 +113,7 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index,
>   	if (direction != DMA_TO_DEVICE)
>   		proto_tce |= TCE_PCI_WRITE;
>   
> -	tces = tcep = ((__be64 *)tbl->it_base) + index;
> +	tcep = ((__be64 *)tbl->it_base) + index;
>   
>   	while (npages--) {
>   		/* can't move this out since we might cross MEMBLOCK boundary */
> @@ -129,9 +129,9 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index,
>   
>   static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
>   {
> -	__be64 *tcep, *tces;
> +	__be64 *tcep;
>   
> -	tces = tcep = ((__be64 *)tbl->it_base) + index;
> +	tcep = ((__be64 *)tbl->it_base) + index;
>   
>   	while (npages--)
>   		*(tcep++) = 0;
> @@ -945,7 +945,7 @@ static phys_addr_t ddw_memory_hotplug_max(void)
>   
>   	for_each_node_by_type(memory, "memory") {
>   		unsigned long start, size;
> -		int ranges, n_mem_addr_cells, n_mem_size_cells, len;
> +		int n_mem_addr_cells, n_mem_size_cells, len;
>   		const __be32 *memcell_buf;
>   
>   		memcell_buf = of_get_property(memory, "reg", &len);
> @@ -955,9 +955,6 @@ static phys_addr_t ddw_memory_hotplug_max(void)
>   		n_mem_addr_cells = of_n_addr_cells(memory);
>   		n_mem_size_cells = of_n_size_cells(memory);
>   
> -		/* ranges in cell */
> -		ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
> -
>   		start = of_read_number(memcell_buf, n_mem_addr_cells);
>   		memcell_buf += n_mem_addr_cells;
>   		size = of_read_number(memcell_buf, n_mem_size_cells);