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Message-Id: <20211117215410.3695-2-logang@deltatee.com>
Date: Wed, 17 Nov 2021 14:53:48 -0700
From: Logan Gunthorpe <logang@...tatee.com>
To: linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
linux-mm@...ck.org, iommu@...ts.linux-foundation.org
Cc: Stephen Bates <sbates@...thlin.com>,
Christoph Hellwig <hch@....de>,
Dan Williams <dan.j.williams@...el.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Christian König <christian.koenig@....com>,
John Hubbard <jhubbard@...dia.com>,
Don Dutile <ddutile@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Jakowski Andrzej <andrzej.jakowski@...el.com>,
Minturn Dave B <dave.b.minturn@...el.com>,
Jason Ekstrand <jason@...kstrand.net>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Xiong Jianxin <jianxin.xiong@...el.com>,
Bjorn Helgaas <helgaas@...nel.org>,
Ira Weiny <ira.weiny@...el.com>,
Robin Murphy <robin.murphy@....com>,
Martin Oliveira <martin.oliveira@...eticom.com>,
Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
Logan Gunthorpe <logang@...tatee.com>,
Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH v4 01/23] lib/scatterlist: cleanup macros into static inline functions
Convert the sg_is_chain(), sg_is_last() and sg_chain_ptr() macros
into static inline functions. There's no reason for these to be macros
and static inline are generally preferred these days.
Also introduce the SG_PAGE_LINK_MASK define so the P2PDMA work, which is
adding another bit to this mask, can do so more easily.
Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
include/linux/scatterlist.h | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 266754a55327..7ff9d6386c12 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -69,10 +69,27 @@ struct sg_append_table {
* a valid sg entry, or whether it points to the start of a new scatterlist.
* Those low bits are there for everyone! (thanks mason :-)
*/
-#define sg_is_chain(sg) ((sg)->page_link & SG_CHAIN)
-#define sg_is_last(sg) ((sg)->page_link & SG_END)
-#define sg_chain_ptr(sg) \
- ((struct scatterlist *) ((sg)->page_link & ~(SG_CHAIN | SG_END)))
+#define SG_PAGE_LINK_MASK (SG_CHAIN | SG_END)
+
+static inline unsigned int __sg_flags(struct scatterlist *sg)
+{
+ return sg->page_link & SG_PAGE_LINK_MASK;
+}
+
+static inline struct scatterlist *sg_chain_ptr(struct scatterlist *sg)
+{
+ return (struct scatterlist *)(sg->page_link & ~SG_PAGE_LINK_MASK);
+}
+
+static inline bool sg_is_chain(struct scatterlist *sg)
+{
+ return __sg_flags(sg) & SG_CHAIN;
+}
+
+static inline bool sg_is_last(struct scatterlist *sg)
+{
+ return __sg_flags(sg) & SG_END;
+}
/**
* sg_assign_page - Assign a given page to an SG entry
@@ -92,7 +109,7 @@ static inline void sg_assign_page(struct scatterlist *sg, struct page *page)
* In order for the low bit stealing approach to work, pages
* must be aligned at a 32-bit boundary as a minimum.
*/
- BUG_ON((unsigned long) page & (SG_CHAIN | SG_END));
+ BUG_ON((unsigned long)page & SG_PAGE_LINK_MASK);
#ifdef CONFIG_DEBUG_SG
BUG_ON(sg_is_chain(sg));
#endif
@@ -126,7 +143,7 @@ static inline struct page *sg_page(struct scatterlist *sg)
#ifdef CONFIG_DEBUG_SG
BUG_ON(sg_is_chain(sg));
#endif
- return (struct page *)((sg)->page_link & ~(SG_CHAIN | SG_END));
+ return (struct page *)((sg)->page_link & ~SG_PAGE_LINK_MASK);
}
/**
--
2.30.2
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