[PATCH v6 04/26] arm64: mte: Add specific SIGSEGV codes

[Catalin Marinas]

From: Vincenzo Frascino <vincenzo.frascino at arm.com>

Add MTE-specific SIGSEGV codes to siginfo.h and update the x86
BUILD_BUG_ON(NSIGSEGV != 7) compile check.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino at arm.com>
[catalin.marinas at arm.com: renamed precise/imprecise to sync/async]
[catalin.marinas at arm.com: dropped #ifdef __aarch64__, renumbered]
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Acked-by: "Eric W. Biederman" <ebiederm at xmission.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Will Deacon <will at kernel.org>
---

Notes:
    v3:
    - Fixed the BUILD_BUG_ON(NSIGSEGV != 7) on x86
    - Updated the commit log
    
    v2:
    - Dropped the #ifdef __aarch64__.
    - Renumbered the SEGV_MTE* values to avoid clash with ADI.

 arch/x86/kernel/signal_compat.c    | 2 +-
 include/uapi/asm-generic/siginfo.h | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 9ccbf0576cd0..a7f3e12cfbdb 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -27,7 +27,7 @@ static inline void signal_compat_build_tests(void)
 	 */
 	BUILD_BUG_ON(NSIGILL  != 11);
 	BUILD_BUG_ON(NSIGFPE  != 15);
-	BUILD_BUG_ON(NSIGSEGV != 7);
+	BUILD_BUG_ON(NSIGSEGV != 9);
 	BUILD_BUG_ON(NSIGBUS  != 5);
 	BUILD_BUG_ON(NSIGTRAP != 5);
 	BUILD_BUG_ON(NSIGCHLD != 6);
diff --git a/include/uapi/asm-generic/siginfo.h b/include/uapi/asm-generic/siginfo.h
index cb3d6c267181..7aacf9389010 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -229,7 +229,9 @@ typedef struct siginfo {
 #define SEGV_ACCADI	5	/* ADI not enabled for mapped object */
 #define SEGV_ADIDERR	6	/* Disrupting MCD error */
 #define SEGV_ADIPERR	7	/* Precise MCD exception */
-#define NSIGSEGV	7
+#define SEGV_MTEAERR	8	/* Asynchronous ARM MTE error */
+#define SEGV_MTESERR	9	/* Synchronous ARM MTE exception */
+#define NSIGSEGV	9
 
 /*
  * SIGBUS si_codes