linux-kernel - [PATCH 3.16 124/305] um: Drop own definition of PTRACE_SYSEMU/

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Message-ID: <lsq.1549201508.595283042@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Richard Weinberger" <richard@....at>,
        "Ritesh Raj Sarraf" <rrs@...earchut.com>
Subject: [PATCH 3.16 124/305] um: Drop own definition of PTRACE_SYSEMU/_SINGLESTEP

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit 0676b957c24bfb6e495449ba7b7e72c5b5d79233 upstream.

32bit UML used to define PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP
own its own because many years ago not all libcs had these request codes
in their UAPI.
These days PTRACE_SYSEMU/_SINGLESTEP is well known and part of glibc
and our own define becomes problematic.

With change c48831d0eebf ("linux/x86: sync sys/ptrace.h with Linux 4.14
[BZ #22433]") glibc turned PTRACE_SYSEMU/_SINGLESTEP into a enum and
UML failed to build.

Let's drop our define and rely on the fact that every libc has
PTRACE_SYSEMU/_SINGLESTEP.

Cc: Ritesh Raj Sarraf <rrs@...earchut.com>
Reported-and-tested-by: Ritesh Raj Sarraf <rrs@...earchut.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/um/shared/sysdep/ptrace_32.h | 10 ----------
 1 file changed, 10 deletions(-)

--- a/arch/x86/um/shared/sysdep/ptrace_32.h
+++ b/arch/x86/um/shared/sysdep/ptrace_32.h
@@ -10,20 +10,10 @@
 
 static inline void update_debugregs(int seq) {}
 
-/* syscall emulation path in ptrace */
-
-#ifndef PTRACE_SYSEMU
-#define PTRACE_SYSEMU 31
-#endif
-
 void set_using_sysemu(int value);
 int get_using_sysemu(void);
 extern int sysemu_supported;
 
-#ifndef PTRACE_SYSEMU_SINGLESTEP
-#define PTRACE_SYSEMU_SINGLESTEP 32
-#endif
-
 #define UPT_SYSCALL_ARG1(r) UPT_BX(r)
 #define UPT_SYSCALL_ARG2(r) UPT_CX(r)
 #define UPT_SYSCALL_ARG3(r) UPT_DX(r)