[PATCH RFC 01/11] mm: introduce hw_pte_t for PTE table storage
Muhammad Usama Anjum <[email protected]>
| Newsgroups | org.xenproject.lists.xen-devel,dev.linux.lists.damon,org.freedesktop.lists.dri-devel,org.freedesktop.lists.intel-gfx,org.kernel.vger.bpf,org.kernel.vger.linux-arch,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-parisc,org.kernel.vger.linux-perf-users,org.kernel.vger.linux-trace-kernel,org.kvack.linux-mm |
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| Message-ID | <[email protected]> |
pte_t is used both for logical PTE values and for entries stored in a PTE table, so pte_t * does not distinguish a pointer to a copied value from a pointer to table storage. Introduce hw_pte_t as the generic name for a PTE table element. Define it as an alias of pte_t by default so architectures retain their existing representation and behavior until they opt in to a distinct storage type. Include asm/page.h so pte_t is defined before the generic alias. Signed-off-by: Muhammad Usama Anjum <[email protected]> --- MAINTAINERS | 1 + include/linux/pgtable_types.h | 11 +++++++++++ 2 files changed, 12 insertions(+) create mode 100644 include/linux/pgtable_types.h diff --git a/MAINTAINERS b/MAINTAINERS index 15dd00c7ffec5..78aac05949829 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16981,6 +16981,7 @@ F: include/linux/mmu_notifier.h F: include/linux/pagewalk.h F: include/linux/pgalloc.h F: include/linux/pgtable.h +F: include/linux/pgtable_types.h F: include/linux/ptdump.h F: include/linux/vmpressure.h F: include/linux/vmstat.h diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h new file mode 100644 index 0000000000000..ed5dba42a4f8c --- /dev/null +++ b/include/linux/pgtable_types.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PGTABLE_TYPES_H +#define _LINUX_PGTABLE_TYPES_H + +#include <asm/page.h> + +#ifndef __HAVE_ARCH_HW_PTE_T +#define hw_pte_t pte_t +#endif + +#endif /* _LINUX_PGTABLE_TYPES_H */ -- 2.47.3