linux-kernel - [PATCH resend] dma-debug: Use memory

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Date:   Thu, 22 Jul 2021 18:55:12 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>,
        "Marek Szyprowski" <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        <iommu@...ts.linux-foundation.org>
Subject: [PATCH resend] dma-debug: Use memory_intersects() directly

There is already a memory_intersects() helper in sections.h,
use memory_intersects() directly instead of private overlap().

Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux-foundation.org
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---

Resend this patch only.

 kernel/dma/debug.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index dadae6255d05..fe6efd181614 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -1064,20 +1064,10 @@ static void check_for_stack(struct device *dev,
 	}
 }
 
-static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
-{
-	unsigned long a1 = (unsigned long)addr;
-	unsigned long b1 = a1 + len;
-	unsigned long a2 = (unsigned long)start;
-	unsigned long b2 = (unsigned long)end;
-
-	return !(b1 <= a2 || a1 >= b2);
-}
-
 static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
 {
-	if (overlap(addr, len, _stext, _etext) ||
-	    overlap(addr, len, __start_rodata, __end_rodata))
+	if (memory_intersects(_stext, _etext, addr, len) ||
+	    memory_intersects(__start_rodata, __end_rodata, addr, len))
 		err_printk(dev, NULL, "device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
 }
 
-- 
2.26.2