linux-kernel - [PATCH 2/4] m68k: Replace NR_syscalls macro from asm/unistd.h

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Date:   Thu,  9 Aug 2018 10:45:21 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     linux-m68k@...ts.linux-m68k.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, arnd@...db.de, deepa.kernel@...il.com,
        marcin.juszkiewicz@...aro.org, firoz.khan@...aro.org
Subject: [PATCH 2/4] m68k: Replace NR_syscalls macro from asm/unistd.h

NR_syscalls macro holds the number of system call exist in m68k
architecture. This macro is currently the part of asm/unistd.h file.
We have to change the value of NR_syscalls, if we add or delete a
system call.

One of patch in this patch series has a script which will generate
a uapi header based on syscall.tbl file. The syscall.tbl file
contains the number of system call information. So we have two
option to update NR_syscalls value.

1. Update NR_syscalls in asm/unistd.h manually by counting the
   no.of system calls. No need to update NR_syscalls untill
   we either add a new system call or delete an existing system
   call.

2. We can keep this feature it above mentioned script, that'll
   count the number of syscalls and keep it in a generated file.
   In this case we don't need to explicitly update NR_syscalls
   in asm/unistd.h file.

The 2nd option will be the recommended one. For that, I moved the
NR_syscalls macro from asm/unistd.h to uapi/asm/unistd.h. The macro
name also changed form NR_syscalls to __NR_syscalls for making the
name convention same across all architecture. While __NR_syscalls
isn't strictly part of the uapi, having it as part of the generated
header to simplifies the implementation.

Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
---
 arch/m68k/68000/entry.S             | 4 ++--
 arch/m68k/coldfire/entry.S          | 2 +-
 arch/m68k/include/asm/unistd.h      | 3 ---
 arch/m68k/include/uapi/asm/unistd.h | 2 ++
 arch/m68k/kernel/entry.S            | 4 ++--
 5 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/m68k/68000/entry.S b/arch/m68k/68000/entry.S
index 259b366..91522e9 100644
--- a/arch/m68k/68000/entry.S
+++ b/arch/m68k/68000/entry.S
@@ -49,7 +49,7 @@ do_trace:
 	addql	#4,%sp
 	movel	%sp@(PT_OFF_ORIG_D0),%d1
 	movel	#-ENOSYS,%d0
-	cmpl	#NR_syscalls,%d1
+	cmpl	#__NR_syscalls,%d1
 	jcc	1f
 	lsl	#2,%d1
 	lea	sys_call_table, %a0
@@ -80,7 +80,7 @@ ENTRY(system_call)
 	movel	%d1,%a2
 	btst	#(TIF_SYSCALL_TRACE%8),%a2@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
 	jne	do_trace
-	cmpl	#NR_syscalls,%d0
+	cmpl	#__NR_syscalls,%d0
 	jcc	badsys
 	lsl	#2,%d0
 	lea	sys_call_table,%a0
diff --git a/arch/m68k/coldfire/entry.S b/arch/m68k/coldfire/entry.S
index 52d312d..efe777d 100644
--- a/arch/m68k/coldfire/entry.S
+++ b/arch/m68k/coldfire/entry.S
@@ -64,7 +64,7 @@ ENTRY(system_call)
 	move	#0x2000,%sr		/* enable intrs again */
 	GET_CURRENT(%d2)
 
-	cmpl	#NR_syscalls,%d0
+	cmpl	#__NR_syscalls,%d0
 	jcc	enosys
 	lea	sys_call_table,%a0
 	lsll	#2,%d0			/* movel %a0@(%d0:l:4),%d3 */
diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 30d0d3f..52111fb 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -4,9 +4,6 @@
 
 #include <uapi/asm/unistd.h>
 
-
-#define NR_syscalls		380
-
 #define __ARCH_WANT_OLD_READDIR
 #define __ARCH_WANT_OLD_STAT
 #define __ARCH_WANT_STAT64
diff --git a/arch/m68k/include/uapi/asm/unistd.h b/arch/m68k/include/uapi/asm/unistd.h
index de3054f..b17ae53 100644
--- a/arch/m68k/include/uapi/asm/unistd.h
+++ b/arch/m68k/include/uapi/asm/unistd.h
@@ -387,4 +387,6 @@
 #define __NR_pwritev2		378
 #define __NR_statx		379
 
+#define __NR_syscalls		380
+
 #endif /* _UAPI_ASM_M68K_UNISTD_H_ */
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 97cd3ea..dab0cfd 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -161,7 +161,7 @@ do_trace_entry:
 	RESTORE_SWITCH_STACK
 	addql	#4,%sp
 	movel	%sp@(PT_OFF_ORIG_D0),%d0
-	cmpl	#NR_syscalls,%d0
+	cmpl	#__NR_syscalls,%d0
 	jcs	syscall
 badsys:
 	movel	#-ENOSYS,%sp@(PT_OFF_D0)
@@ -206,7 +206,7 @@ ENTRY(system_call)
 	| syscall trace?
 	tstb	%a1@(TINFO_FLAGS+2)
 	jmi	do_trace_entry
-	cmpl	#NR_syscalls,%d0
+	cmpl	#__NR_syscalls,%d0
 	jcc	badsys
 syscall:
 	jbsr	@(sys_call_table,%d0:l:4)@(0)
-- 
1.9.1