linux-kernel - [tip: x86/urgent] x86: Remove the arch_calc_vm_prot

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Message-ID: <169403743706.27769.33130108048902877.tip-bot2@tip-bot2>
Date:   Wed, 06 Sep 2023 21:57:17 -0000
From:   "tip-bot2 for Thomas Huth" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Huth <thuth@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Nicolas Schier <nicolas@...sle.eu>,
        Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86: Remove the arch_calc_vm_prot_bits() macro from
 the UAPI

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

Commit-ID:     659df86a7b2fe98feb5f4ec880e694caaebd27ae
Gitweb:        https://git.kernel.org/tip/659df86a7b2fe98feb5f4ec880e694caaebd27ae
Author:        Thomas Huth <thuth@...hat.com>
AuthorDate:    Wed, 06 Sep 2023 18:26:58 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 06 Sep 2023 23:50:46 +02:00

x86: Remove the arch_calc_vm_prot_bits() macro from the UAPI

The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
not part of the UAPI, so the macro is completely useless for userspace.

It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
config switch which we shouldn't expose to userspace. Thus let's move
this macro into a new internal header instead.

Fixes: 8f62c883222c ("x86/mm/pkeys: Add arch-specific VMA protection bits")
Signed-off-by: Thomas Huth <thuth@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
Acked-by: Dave Hansen <dave.hansen@...el.com>
Link: https://lore.kernel.org/r/20230906162658.142511-1-thuth@redhat.com
---
 arch/x86/include/asm/mman.h      | 15 +++++++++++++++
 arch/x86/include/uapi/asm/mman.h |  8 --------
 scripts/headers_install.sh       |  1 -
 3 files changed, 15 insertions(+), 9 deletions(-)
 create mode 100644 arch/x86/include/asm/mman.h

diff --git a/arch/x86/include/asm/mman.h b/arch/x86/include/asm/mman.h
new file mode 100644
index 0000000..12b8202
--- /dev/null
+++ b/arch/x86/include/asm/mman.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MMAN_H__
+#define __ASM_MMAN_H__
+
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+#define arch_calc_vm_prot_bits(prot, key) (		\
+		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
+		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
+		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
+		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
+#endif
+
+#include <uapi/asm/mman.h>
+
+#endif /* __ASM_MMAN_H__ */
diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h
index 8148bdd..46cdc94 100644
--- a/arch/x86/include/uapi/asm/mman.h
+++ b/arch/x86/include/uapi/asm/mman.h
@@ -5,14 +5,6 @@
 #define MAP_32BIT	0x40		/* only give out 32bit addresses */
 #define MAP_ABOVE4G	0x80		/* only map above 4GB */
 
-#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
-#define arch_calc_vm_prot_bits(prot, key) (		\
-		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
-		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
-		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
-		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
-#endif
-
 /* Flags for map_shadow_stack(2) */
 #define SHADOW_STACK_SET_TOKEN	(1ULL << 0)	/* Set up a restore token in the shadow stack */
 
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index afdddc8..56d3c33 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -81,7 +81,6 @@ arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
 arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
 arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
 arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
-arch/x86/include/uapi/asm/mman.h:CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
 "
 
 for c in $configs