[tip: x86/mm] x86/mm: Nuke PAGE_KERNEL_IO

[tip-bot2 for Lucas De Marchi]

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     27dff0f58bdef4bcafdad8a8c2217d561bcf9506
Gitweb:        https://git.kernel.org/tip/27dff0f58bdef4bcafdad8a8c2217d561bcf9506
Author:        Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
AuthorDate:    Thu, 21 Oct 2021 11:15:11 -07:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Mon, 15 Nov 2021 10:57:55 -08:00

x86/mm: Nuke PAGE_KERNEL_IO

PAGE_KERNEL_IO is only defined for x86 and nowadays is the same as
PAGE_KERNEL. It was different for some time, OR'ing a `_PAGE_IOMAP` flag
in commit be43d72835ba ("x86: add _PAGE_IOMAP pte flag for IO
mappings").  This got removed in commit f955371ca9d3 ("x86: remove the
Xen-specific _PAGE_IOMAP PTE flag"), so today they are just the same.

With the last users outside arch/x86 being remove we can now remove
PAGE_KERNEL_IO.

[ dhansen: dropped arch/x86/xen/setup.c hunk.  This
	   9a58b352e9e8 ("xen/x86: restrict PV Dom0 identity mapping")
	   already axed its use of PAGE_KERNEL_IO ]

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20211021181511.1533377-3-lucas.demarchi@xxxxxxxxx
---
 arch/x86/include/asm/fixmap.h        | 2 +-
 arch/x86/include/asm/pgtable_types.h | 7 -------
 arch/x86/mm/ioremap.c                | 2 +-
 include/asm-generic/fixmap.h         | 2 +-
 4 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index d0dcefb..5e186a6 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -173,7 +173,7 @@ static inline void __set_fixmap(enum fixed_addresses idx,
  * supported for MMIO addresses, so make sure that the memory encryption
  * mask is not part of the page attributes.
  */
-#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
+#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
 
 /*
  * Early memremap routines used for in-place encryption. The mappings created
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 40497a9..a872247 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -199,10 +199,6 @@ enum page_cache_mode {
 #define __PAGE_KERNEL_WP	 (__PP|__RW|   0|___A|__NX|___D|   0|___G| __WP)
 
 
-#define __PAGE_KERNEL_IO		__PAGE_KERNEL
-#define __PAGE_KERNEL_IO_NOCACHE	__PAGE_KERNEL_NOCACHE
-
-
 #ifndef __ASSEMBLY__
 
 #define __PAGE_KERNEL_ENC	(__PAGE_KERNEL    | _ENC)
@@ -223,9 +219,6 @@ enum page_cache_mode {
 #define PAGE_KERNEL_LARGE_EXEC	__pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC)
 #define PAGE_KERNEL_VVAR	__pgprot_mask(__PAGE_KERNEL_VVAR       | _ENC)
 
-#define PAGE_KERNEL_IO		__pgprot_mask(__PAGE_KERNEL_IO)
-#define PAGE_KERNEL_IO_NOCACHE	__pgprot_mask(__PAGE_KERNEL_IO_NOCACHE)
-
 #endif	/* __ASSEMBLY__ */
 
 /*         xwr */
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 026031b..3102dda 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -243,7 +243,7 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size,
 	 * make sure the memory encryption attribute is enabled in the
 	 * resulting mapping.
 	 */
-	prot = PAGE_KERNEL_IO;
+	prot = PAGE_KERNEL;
 	if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted)
 		prot = pgprot_encrypted(prot);
 
diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 8cc7b09..f1b0c6f 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -54,7 +54,7 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
 #endif
 #ifndef FIXMAP_PAGE_IO
-#define FIXMAP_PAGE_IO PAGE_KERNEL_IO
+#define FIXMAP_PAGE_IO PAGE_KERNEL
 #endif
 #ifndef FIXMAP_PAGE_CLEAR
 #define FIXMAP_PAGE_CLEAR __pgprot(0)