[PATCH V4 01/26] mm/mmap: Build protect protection_map[] with __P000
From: Anshuman Khandual <hidden>
Date: 2022-06-24 04:44:19
Also in:
linux-alpha, linux-arm-kernel, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, lkml, sparclinux
Subsystem:
memory management, memory management - core, memory mapping, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
Build protect generic protection_map[] array with __P000, so that it can be moved inside all the platforms one after the other. Otherwise there will be build failures during this process. CONFIG_ARCH_HAS_VM_GET_PAGE_PROT cannot be used for this purpose as only certain platforms enable this config now. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Suggested-by: Christophe Leroy <redacted> Signed-off-by: Anshuman Khandual <redacted> --- include/linux/mm.h | 2 ++ mm/mmap.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bc8f326be0ce..47bfe038d46e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -424,7 +424,9 @@ extern unsigned int kobjsize(const void *objp); * mapping from the currently active vm_flags protection bits (the * low four bits) to a page protection mask.. */ +#ifdef __P000 extern pgprot_t protection_map[16]; +#endif /* * The default fault flags that should be used by most of the
diff --git a/mm/mmap.c b/mm/mmap.c
index 61e6135c54ef..b01f0280bda2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -101,6 +101,7 @@ static void unmap_region(struct mm_struct *mm, * w: (no) no * x: (yes) yes */ +#ifdef __P000 pgprot_t protection_map[16] __ro_after_init = { [VM_NONE] = __P000, [VM_READ] = __P001,
@@ -119,6 +120,7 @@ pgprot_t protection_map[16] __ro_after_init = { [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 }; +#endif #ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT pgprot_t vm_get_page_prot(unsigned long vm_flags)
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2.25.1