linux-kernel - [RFC 1/4] mm: Remove PFN_MAP, PFN_SG_CHAIN and PFN_SG

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Message-ID: <106d22a58b4971a2e41ca65d9ceb30ed81fcf727.1736299058.git-series.apopple@nvidia.com>
Date: Wed,  8 Jan 2025 12:18:45 +1100
From: Alistair Popple <apopple@...dia.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: Alistair Popple <apopple@...dia.com>,
	gerald.schaefer@...ux.ibm.com,
	dan.j.williams@...el.com,
	jgg@...pe.ca,
	willy@...radead.org,
	david@...hat.com,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	jhubbard@...dia.com,
	hch@....de
Subject: [RFC 1/4] mm: Remove PFN_MAP, PFN_SG_CHAIN and PFN_SG_LAST

The PFN_MAP flag is no longer used for anything, so remove it. The
PFN_SG_CHAIN and PFN_SG_LAST flags never appear to have been used so
also remove them.

Signed-off-by: Alistair Popple <apopple@...dia.com>
---
 include/linux/pfn_t.h             | 10 ++--------
 tools/testing/nvdimm/test/iomap.c |  4 ----
 2 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 76e519b..75bb77c 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -11,16 +11,10 @@
  * PFN_MAP - pfn has a dynamic page mapping established by a device driver
  */
 #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
-#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
-#define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))
 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
-#define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
 
 #define PFN_FLAGS_TRACE \
-	{ PFN_SG_CHAIN,	"SG_CHAIN" }, \
-	{ PFN_SG_LAST,	"SG_LAST" }, \
-	{ PFN_DEV,	"DEV" }, \
-	{ PFN_MAP,	"MAP" }
+	{ PFN_DEV,	"DEV" }
 
 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
 {
@@ -42,7 +36,7 @@ static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
 
 static inline bool pfn_t_has_page(pfn_t pfn)
 {
-	return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
+	return (pfn.val & PFN_DEV) == 0;
 }
 
 static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index e431372..ddceb04 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -137,10 +137,6 @@ EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
 
 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
 {
-	struct nfit_test_resource *nfit_res = get_nfit_res(addr);
-
-	if (nfit_res)
-		flags &= ~PFN_MAP;
         return phys_to_pfn_t(addr, flags);
 }
 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
-- 
git-series 0.9.1