From: Matt Turner <mattst88@gmail.com>
To: linux-alpha@vger.kernel.org, richard.henderson@linaro.org
Cc: linmag7@gmail.com, linux-kernel@vger.kernel.org
Subject: [PATCH 13/24] alpha: add ARCH_HAS_PTE_SPECIAL support
Date: Tue, 1 Sep 2026 11:50:26 -0400 [thread overview]
Message-ID: <802e4076e332cb82fcca73d8e22e0a591e44ab45.1788277742.git.mattst88@gmail.com> (raw)
In-Reply-To: <cover.1788277742.git.mattst88@gmail.com>
Add _PAGE_SPECIAL using bit 19 (0x80000), which is unused in the Alpha
PTE layout. This enables pte_special()/pte_mkspecial() for marking PTEs
that are not backed by struct page (VDSO mappings, zero page,
io_remap_pfn_range, etc.).
Include _PAGE_SPECIAL in _PAGE_CHG_MASK so it is preserved across
pte_modify() calls.
Assisted-by: Claude:claude-opus-4-6
Signed-off-by: Matt Turner <mattst88@gmail.com>
---
arch/alpha/Kconfig | 1 +
arch/alpha/include/asm/pgtable.h | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git ./arch/alpha/Kconfig ./arch/alpha/Kconfig
index e6fa8da0abff..4c38405cd6cd 100644
--- ./arch/alpha/Kconfig
+++ ./arch/alpha/Kconfig
@@ -8,6 +8,7 @@ config ALPHA
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+ select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_UBSAN
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
diff --git ./arch/alpha/include/asm/pgtable.h ./arch/alpha/include/asm/pgtable.h
index 8e00cf9dc39d..bdff33b505bc 100644
--- ./arch/alpha/include/asm/pgtable.h
+++ ./arch/alpha/include/asm/pgtable.h
@@ -73,6 +73,7 @@ struct vm_area_struct;
/* .. and these are ours ... */
#define _PAGE_DIRTY 0x20000
#define _PAGE_ACCESSED 0x40000
+#define _PAGE_SPECIAL 0x80000
/* We borrow bit 39 to store the exclusive marker in swap PTEs. */
#define _PAGE_SWP_EXCLUSIVE 0x8000000000UL
@@ -94,7 +95,7 @@ struct vm_area_struct;
#define _PFN_MASK 0xFFFFFFFF00000000UL
#define _PAGE_TABLE (_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS)
-#define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS)
+#define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS | _PAGE_SPECIAL)
/*
* All the normal masks have the "page accessed" bits on, as any time they are used,
@@ -238,6 +239,8 @@ extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); ret
extern inline pte_t pte_mkwrite_novma(pte_t pte){ pte_val(pte) &= ~_PAGE_FOW; return pte; }
extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
+extern inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
+extern inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
/*
* The smp_rmb() in the following functions are required to order the load of
--
2.54.0
next prev parent reply other threads:[~2026-09-01 15:51 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 15:50 [PATCH 00/24] alpha: catch up on architecture Kconfig options Matt Turner
2026-09-01 15:50 ` [PATCH 01/24] alpha: fix arch_irqs_disabled_flags() to treat any raised IPL as disabled Matt Turner
2026-09-01 23:20 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor Matt Turner
2026-09-03 22:07 ` Magnus Lindholm
2026-09-05 2:43 ` Matt Turner
2026-09-05 8:28 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 03/24] alpha: select ARCH_HAS_UBSAN Matt Turner
2026-09-01 22:34 ` Magnus Lindholm
2026-09-04 20:31 ` Michael Cree
2026-09-04 23:15 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 04/24] alpha: select ARCH_HAS_GCOV_PROFILE_ALL Matt Turner
2026-09-03 22:35 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 05/24] alpha: select HAVE_DEBUG_KMEMLEAK Matt Turner
2026-09-02 6:01 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 06/24] alpha: select EDAC_SUPPORT Matt Turner
2026-09-01 23:17 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 07/24] alpha: select ARCH_SUPPORTS_ATOMIC_RMW Matt Turner
2026-09-02 6:17 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 08/24] alpha: select ARCH_HAS_FAST_MULTIPLIER Matt Turner
2026-09-02 7:49 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 09/24] alpha: select ARCH_SUPPORTS_INT128 Matt Turner
2026-09-02 8:50 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 10/24] alpha: select HAVE_ARCH_COMPILER_H Matt Turner
2026-09-02 9:11 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 11/24] alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE Matt Turner
2026-09-02 9:25 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 12/24] alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support Matt Turner
2026-09-02 9:35 ` Magnus Lindholm
2026-09-01 15:50 ` Matt Turner [this message]
2026-09-02 9:42 ` [PATCH 13/24] alpha: add ARCH_HAS_PTE_SPECIAL support Magnus Lindholm
2026-09-01 15:50 ` [PATCH 14/24] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support Matt Turner
2026-09-01 22:45 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 15/24] alpha: select ARCH_HAS_DEBUG_VM_PGTABLE Matt Turner
2026-09-03 22:52 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 16/24] alpha: select HAVE_GUP_FAST Matt Turner
2026-09-02 21:09 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 17/24] alpha: select ARCH_USE_MEMTEST Matt Turner
2026-09-02 21:56 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 18/24] alpha: select SYSCTL_EXCEPTION_TRACE Matt Turner
2026-09-02 22:02 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 19/24] alpha: discard .eh_frame and the relocation sections Matt Turner
2026-09-03 5:18 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 20/24] alpha: select ARCH_WANT_LD_ORPHAN_WARN Matt Turner
2026-09-03 5:34 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 21/24] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Matt Turner
2026-09-03 5:42 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 22/24] alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support Matt Turner
2026-09-03 21:01 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 23/24] alpha: select SPARSE_IRQ Matt Turner
2026-09-03 21:26 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 24/24] alpha: add TRACE_IRQFLAGS_SUPPORT Matt Turner
2026-09-03 22:58 ` Magnus Lindholm
2026-09-02 18:53 ` [PATCH 00/24] alpha: catch up on architecture Kconfig options Magnus Lindholm
2026-09-02 18:57 ` Matt Turner
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