linux-kernel - [PATCH] dmaengine: dw-edma: fix unnecessary stack usage

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Date:   Mon, 17 Jun 2019 15:16:45 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Joao Pinto <jpinto@...opsys.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: dw-edma: fix unnecessary stack usage

Putting large constant data on the stack causes unnecessary overhead
and stack usage:

drivers/dma/dw-edma/dw-edma-v0-debugfs.c:285:6: error: stack frame size of 1376 bytes in function 'dw_edma_v0_debugfs_on' [-Werror,-Wframe-larger-than=]

Mark the variable 'static const' in order for the compiler to move it
into the .rodata section where it does no such harm.

Fixes: 305aebeff879 ("dmaengine: Add Synopsys eDMA IP version 0 debugfs support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/dma/dw-edma/dw-edma-v0-debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
index affa1ccaf7a0..42739508c0d8 100644
--- a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
+++ b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
@@ -48,7 +48,7 @@ static struct {
 } lim[2][EDMA_V0_MAX_NR_CH];
 
 struct debugfs_entries {
-	char					name[24];
+	const char				*name;
 	dma_addr_t				*reg;
 };
 
-- 
2.20.0