linux-kernel - [PATCH] fsldma: fsl_ioread64*() do not need lower_32

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Date:   Sat, 29 Aug 2020 14:45:38 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <joerg.roedel@....com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Li Yang <leoyang.li@....com>, Zhang Wei <zw@...kernel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fsldma: fsl_ioread64*() do not need lower_32_bits()

For ppc32, the functions fsl_ioread64() & fsl_ioread64be()
use lower_32_bits() as a fancy way to cast the pointer to u32
in order to do non-atomic 64-bit IO.

But the pointer is already 32-bit, so simply cast the pointer to u32.

This fixes a compile error introduced by
   ef91bb196b0d ("kernel.h: Silence sparse warning in lower_32_bits")

Fixes: ef91bb196b0db1013ef8705367bc2d7944ef696b
Reported-by: Guenter Roeck <linux@...ck-us.net>
Cc: Li Yang <leoyang.li@....com>
Cc: Zhang Wei <zw@...kernel.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vinod Koul <vkoul@...nel.org>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: dmaengine@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
---
 drivers/dma/fsldma.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index 56f18ae99233..6f6fa7641fa2 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -205,7 +205,7 @@ struct fsldma_chan {
 #else
 static u64 fsl_ioread64(const u64 __iomem *addr)
 {
-	u32 fsl_addr = lower_32_bits(addr);
+	u32 fsl_addr = (u32) addr;
 	u64 fsl_addr_hi = (u64)in_le32((u32 *)(fsl_addr + 1)) << 32;
 
 	return fsl_addr_hi | in_le32((u32 *)fsl_addr);
@@ -219,7 +219,7 @@ static void fsl_iowrite64(u64 val, u64 __iomem *addr)
 
 static u64 fsl_ioread64be(const u64 __iomem *addr)
 {
-	u32 fsl_addr = lower_32_bits(addr);
+	u32 fsl_addr = (u32) addr;
 	u64 fsl_addr_hi = (u64)in_be32((u32 *)fsl_addr) << 32;
 
 	return fsl_addr_hi | in_be32((u32 *)(fsl_addr + 1));
-- 
2.28.0