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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s
Date: Tue, 29 Mar 2022 18:43:28 +0200	[thread overview]
Message-ID: <20220329164329.208407-8-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

The swap type is simply stored in bits 0x1f of the swap pte. Let's
simplify by just getting rid of _PAGE_BIT_SWAP_TYPE. It's not like that
we can simply change it: _PAGE_SWP_SOFT_DIRTY would suddenly fall into
_RPAGE_RSV1, which isn't possible and would make the
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY) angry.

While at it, make it clearer which bit we're actually using for
_PAGE_SWP_SOFT_DIRTY by just using the proper define and introduce and
use SWP_TYPE_MASK.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 875730d5af40..8e98375d5c4a 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -13,7 +13,6 @@
 /*
  * Common bits between hash and Radix page table
  */
-#define _PAGE_BIT_SWAP_TYPE	0
 
 #define _PAGE_EXEC		0x00001 /* execute permission */
 #define _PAGE_WRITE		0x00002 /* write access allowed */
@@ -751,17 +750,16 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 	 * Don't have overlapping bits with _PAGE_HPTEFLAGS	\
 	 * We filter HPTEFLAGS on set_pte.			\
 	 */							\
-	BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
+	BUILD_BUG_ON(_PAGE_HPTEFLAGS & SWP_TYPE_MASK); \
 	BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY);	\
 	} while (0)
 
 #define SWP_TYPE_BITS 5
-#define __swp_type(x)		(((x).val >> _PAGE_BIT_SWAP_TYPE) \
-				& ((1UL << SWP_TYPE_BITS) - 1))
+#define SWP_TYPE_MASK		((1UL << SWP_TYPE_BITS) - 1)
+#define __swp_type(x)		((x).val & SWP_TYPE_MASK)
 #define __swp_offset(x)		(((x).val & PTE_RPN_MASK) >> PAGE_SHIFT)
 #define __swp_entry(type, offset)	((swp_entry_t) { \
-				((type) << _PAGE_BIT_SWAP_TYPE) \
-				| (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
+				(type) | (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
 /*
  * swp_entry_t must be independent of pte bits. We build a swp_entry_t from
  * swap type and offset we get from swap and convert that to pte to find a
@@ -774,7 +772,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define __swp_entry_to_pmd(x)	(pte_pmd(__swp_entry_to_pte(x)))
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
-#define _PAGE_SWP_SOFT_DIRTY   (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
+#define _PAGE_SWP_SOFT_DIRTY	_PAGE_NON_IDEMPOTENT
 #else
 #define _PAGE_SWP_SOFT_DIRTY	0UL
 #endif /* CONFIG_MEM_SOFT_DIRTY */
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Jan Kara <jack@suse.cz>,
	David Hildenbrand <david@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Yang Shi <shy828301@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Xu <peterx@redhat.com>, Michal Hocko <mhocko@kernel.org>,
	linux-mm@kvack.org, Donald Dutile <ddutile@redhat.com>,
	Liang Zhang <zhangliang5@huawei.com>,
	Borislav Petkov <bp@alien8.de>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>,
	Paul Mackerras <paulus@samba.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, Vasily Gorbik <gor@linux.ibm.com>,
	Rik van Riel <riel@surriel.com>, Hugh Dickins <hughd@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-arm-kernel@lists.infradead.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	David Rientjes <rientjes@google.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Jann Horn <jannh@google.com>, John Hubbard <jhubbard@nvidia.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Shakeel Butt <shakeelb@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	linuxppc-dev@lists.ozlabs.org, Oleg Nesterov <oleg@redhat.com>,
	Nadav Amit <namit@vmware.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Roman Gushchin <guro@fb.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s
Date: Tue, 29 Mar 2022 18:43:28 +0200	[thread overview]
Message-ID: <20220329164329.208407-8-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

The swap type is simply stored in bits 0x1f of the swap pte. Let's
simplify by just getting rid of _PAGE_BIT_SWAP_TYPE. It's not like that
we can simply change it: _PAGE_SWP_SOFT_DIRTY would suddenly fall into
_RPAGE_RSV1, which isn't possible and would make the
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY) angry.

While at it, make it clearer which bit we're actually using for
_PAGE_SWP_SOFT_DIRTY by just using the proper define and introduce and
use SWP_TYPE_MASK.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 875730d5af40..8e98375d5c4a 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -13,7 +13,6 @@
 /*
  * Common bits between hash and Radix page table
  */
-#define _PAGE_BIT_SWAP_TYPE	0
 
 #define _PAGE_EXEC		0x00001 /* execute permission */
 #define _PAGE_WRITE		0x00002 /* write access allowed */
@@ -751,17 +750,16 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 	 * Don't have overlapping bits with _PAGE_HPTEFLAGS	\
 	 * We filter HPTEFLAGS on set_pte.			\
 	 */							\
-	BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
+	BUILD_BUG_ON(_PAGE_HPTEFLAGS & SWP_TYPE_MASK); \
 	BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY);	\
 	} while (0)
 
 #define SWP_TYPE_BITS 5
-#define __swp_type(x)		(((x).val >> _PAGE_BIT_SWAP_TYPE) \
-				& ((1UL << SWP_TYPE_BITS) - 1))
+#define SWP_TYPE_MASK		((1UL << SWP_TYPE_BITS) - 1)
+#define __swp_type(x)		((x).val & SWP_TYPE_MASK)
 #define __swp_offset(x)		(((x).val & PTE_RPN_MASK) >> PAGE_SHIFT)
 #define __swp_entry(type, offset)	((swp_entry_t) { \
-				((type) << _PAGE_BIT_SWAP_TYPE) \
-				| (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
+				(type) | (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
 /*
  * swp_entry_t must be independent of pte bits. We build a swp_entry_t from
  * swap type and offset we get from swap and convert that to pte to find a
@@ -774,7 +772,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define __swp_entry_to_pmd(x)	(pte_pmd(__swp_entry_to_pte(x)))
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
-#define _PAGE_SWP_SOFT_DIRTY   (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
+#define _PAGE_SWP_SOFT_DIRTY	_PAGE_NON_IDEMPOTENT
 #else
 #define _PAGE_SWP_SOFT_DIRTY	0UL
 #endif /* CONFIG_MEM_SOFT_DIRTY */
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s
Date: Tue, 29 Mar 2022 18:43:28 +0200	[thread overview]
Message-ID: <20220329164329.208407-8-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

The swap type is simply stored in bits 0x1f of the swap pte. Let's
simplify by just getting rid of _PAGE_BIT_SWAP_TYPE. It's not like that
we can simply change it: _PAGE_SWP_SOFT_DIRTY would suddenly fall into
_RPAGE_RSV1, which isn't possible and would make the
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY) angry.

While at it, make it clearer which bit we're actually using for
_PAGE_SWP_SOFT_DIRTY by just using the proper define and introduce and
use SWP_TYPE_MASK.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 875730d5af40..8e98375d5c4a 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -13,7 +13,6 @@
 /*
  * Common bits between hash and Radix page table
  */
-#define _PAGE_BIT_SWAP_TYPE	0
 
 #define _PAGE_EXEC		0x00001 /* execute permission */
 #define _PAGE_WRITE		0x00002 /* write access allowed */
@@ -751,17 +750,16 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 	 * Don't have overlapping bits with _PAGE_HPTEFLAGS	\
 	 * We filter HPTEFLAGS on set_pte.			\
 	 */							\
-	BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
+	BUILD_BUG_ON(_PAGE_HPTEFLAGS & SWP_TYPE_MASK); \
 	BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY);	\
 	} while (0)
 
 #define SWP_TYPE_BITS 5
-#define __swp_type(x)		(((x).val >> _PAGE_BIT_SWAP_TYPE) \
-				& ((1UL << SWP_TYPE_BITS) - 1))
+#define SWP_TYPE_MASK		((1UL << SWP_TYPE_BITS) - 1)
+#define __swp_type(x)		((x).val & SWP_TYPE_MASK)
 #define __swp_offset(x)		(((x).val & PTE_RPN_MASK) >> PAGE_SHIFT)
 #define __swp_entry(type, offset)	((swp_entry_t) { \
-				((type) << _PAGE_BIT_SWAP_TYPE) \
-				| (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
+				(type) | (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
 /*
  * swp_entry_t must be independent of pte bits. We build a swp_entry_t from
  * swap type and offset we get from swap and convert that to pte to find a
@@ -774,7 +772,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define __swp_entry_to_pmd(x)	(pte_pmd(__swp_entry_to_pte(x)))
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
-#define _PAGE_SWP_SOFT_DIRTY   (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
+#define _PAGE_SWP_SOFT_DIRTY	_PAGE_NON_IDEMPOTENT
 #else
 #define _PAGE_SWP_SOFT_DIRTY	0UL
 #endif /* CONFIG_MEM_SOFT_DIRTY */
-- 
2.35.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-03-29 16:50 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 16:43 [PATCH v2 0/8] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 1/8] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-13  8:58   ` Miaohe Lin
2022-04-13  9:30     ` David Hildenbrand
2022-04-13  9:38       ` Miaohe Lin
2022-04-13 10:46         ` David Hildenbrand
2022-04-13 12:31         ` David Hildenbrand
2022-04-14  2:40           ` Miaohe Lin
2022-04-20 17:10   ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:13     ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 2/8] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-20 17:14   ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-03-29 16:43 ` [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-19 12:46   ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 4/8] arm64/pgtable: " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 5/8] s390/pgtable: cleanup description of swp pte layout David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` David Hildenbrand [this message]
2022-03-29 16:43   ` [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30  6:07   ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:58     ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 8/8] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand

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