[tip:x86/mm] x86/vsyscall/64: Use X86_PF constants in the simulated #PF error code

[tip-bot for Andy Lutomirski <tipbot@xxxxxxxxx>]

Commit-ID:  af2ebdcf044039e89da3cd44c0f04dea317020c5
Gitweb:     https://git.kernel.org/tip/af2ebdcf044039e89da3cd44c0f04dea317020c5
Author:     Andy Lutomirski <luto@xxxxxxxxxx>
AuthorDate: Wed, 21 Nov 2018 15:11:26 -0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 22 Nov 2018 09:24:27 +0100

x86/vsyscall/64: Use X86_PF constants in the simulated #PF error code

Rather than hardcoding 6 with a comment, use the defined constants.

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/e023f20352b0d05a8b0205629897917262d2ad68.1542841400.git.luto@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/entry/vsyscall/vsyscall_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscall/vsyscall_64.c
index 85fd85d52ffd..d78bcc03e60e 100644
--- a/arch/x86/entry/vsyscall/vsyscall_64.c
+++ b/arch/x86/entry/vsyscall/vsyscall_64.c
@@ -102,7 +102,7 @@ static bool write_ok_or_segv(unsigned long ptr, size_t size)
 	if (!access_ok(VERIFY_WRITE, (void __user *)ptr, size)) {
 		struct thread_struct *thread = &current->thread;
 
-		thread->error_code	= 6;  /* user fault, no page, write */
+		thread->error_code	= X86_PF_USER | X86_PF_WRITE;
 		thread->cr2		= ptr;
 		thread->trap_nr		= X86_TRAP_PF;