[PATCH] riscv: ccache: Remove unused variable

[PATCH] riscv: ccache: Remove unused variable

[Yash Shah]

Reading the count register clears the interrupt signal. Currently, the
count registers are read into 'regval' variable but the variable is
never used. Therefore remove it.

Signed-off-by: Yash Shah <yash.shah@sifive.com>
---
 arch/riscv/mm/sifive_l2_cache.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/mm/sifive_l2_cache.c b/arch/riscv/mm/sifive_l2_cache.c
index 4eb6461..3052a42 100644
--- a/arch/riscv/mm/sifive_l2_cache.c
+++ b/arch/riscv/mm/sifive_l2_cache.c
@@ -109,13 +109,13 @@ int unregister_sifive_l2_error_notifier(struct notifier_block *nb)
 
 static irqreturn_t l2_int_handler(int irq, void *device)
 {
-	unsigned int regval, add_h, add_l;
+	unsigned int add_h, add_l;
 
 	if (irq == g_irq[DIR_CORR]) {
 		add_h = readl(l2_base + SIFIVE_L2_DIRECCFIX_HIGH);
 		add_l = readl(l2_base + SIFIVE_L2_DIRECCFIX_LOW);
 		pr_err("L2CACHE: DirError @ 0x%08X.%08X\n", add_h, add_l);
-		regval = readl(l2_base + SIFIVE_L2_DIRECCFIX_COUNT);
+		readl(l2_base + SIFIVE_L2_DIRECCFIX_COUNT);
 		atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE,
 					   "DirECCFix");
 	}
@@ -123,7 +123,7 @@ static irqreturn_t l2_int_handler(int irq, void *device)
 		add_h = readl(l2_base + SIFIVE_L2_DATECCFIX_HIGH);
 		add_l = readl(l2_base + SIFIVE_L2_DATECCFIX_LOW);
 		pr_err("L2CACHE: DataError @ 0x%08X.%08X\n", add_h, add_l);
-		regval = readl(l2_base + SIFIVE_L2_DATECCFIX_COUNT);
+		readl(l2_base + SIFIVE_L2_DATECCFIX_COUNT);
 		atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE,
 					   "DatECCFix");
 	}
@@ -131,7 +131,7 @@ static irqreturn_t l2_int_handler(int irq, void *device)
 		add_h = readl(l2_base + SIFIVE_L2_DATECCFAIL_HIGH);
 		add_l = readl(l2_base + SIFIVE_L2_DATECCFAIL_LOW);
 		pr_err("L2CACHE: DataFail @ 0x%08X.%08X\n", add_h, add_l);
-		regval = readl(l2_base + SIFIVE_L2_DATECCFAIL_COUNT);
+		readl(l2_base + SIFIVE_L2_DATECCFAIL_COUNT);
 		atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_UE,
 					   "DatECCFail");
 	}
-- 
1.9.1

Re: [PATCH] riscv: ccache: Remove unused variable

[Christoph Hellwig]

On Thu, Jun 27, 2019 at 02:04:46PM +0530, Yash Shah wrote:
> Reading the count register clears the interrupt signal. Currently, the
> count registers are read into 'regval' variable but the variable is
> never used. Therefore remove it.
> 
> Signed-off-by: Yash Shah <yash.shah@sifive.com>
> ---
>  arch/riscv/mm/sifive_l2_cache.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Unrelated note:  that driver absolutely does not belong into
arch/riscv/mm.  arch/$(ARCH)/mm is for architecte-specific memory
management code, not for random drivers.

Re: [PATCH] riscv: ccache: Remove unused variable

[Paul Walmsley]

On Thu, 27 Jun 2019, Yash Shah wrote:

> Reading the count register clears the interrupt signal. Currently, the
> count registers are read into 'regval' variable but the variable is
> never used. Therefore remove it.
> 
> Signed-off-by: Yash Shah <yash.shah@sifive.com>

This is a good start.  Could you also add comments in the code that 
describe what those reads are doing, as you did in the patch description?  
Otherwise they look pretty mysterious.


- Paul

Re: [PATCH] riscv: ccache: Remove unused variable

[Yash Shah]

On Thu, Jun 27, 2019 at 9:43 PM Paul Walmsley <paul.walmsley@sifive.com> wrote:
>
> On Thu, 27 Jun 2019, Yash Shah wrote:
>
> > Reading the count register clears the interrupt signal. Currently, the
> > count registers are read into 'regval' variable but the variable is
> > never used. Therefore remove it.
> >
> > Signed-off-by: Yash Shah <yash.shah@sifive.com>
>
> This is a good start.  Could you also add comments in the code that
> describe what those reads are doing, as you did in the patch description?
> Otherwise they look pretty mysterious.
>

Sure, will add comments and send v2

>
> - Paul