[PATCH 1/5] ia64: Replace NR_syscalls macro from asm/unistd.h

[Firoz Khan]

__NR_syscalls macro holds the number of system call exist in IA64
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 the 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@xxxxxxxxxx>
---
 arch/ia64/include/asm/unistd.h      | 4 ----
 arch/ia64/include/uapi/asm/unistd.h | 2 ++
 arch/ia64/kernel/entry.S            | 4 ++--
 arch/ia64/kernel/fsys.S             | 2 +-
 arch/ia64/kernel/gate.S             | 4 ++--
 arch/ia64/kernel/ivt.S              | 2 +-
 arch/ia64/kernel/patch.c            | 2 +-
 arch/ia64/mm/init.c                 | 6 +++---
 8 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h
index ffb705d..6d1b047 100644
--- a/arch/ia64/include/asm/unistd.h
+++ b/arch/ia64/include/asm/unistd.h
@@ -10,10 +10,6 @@
 
 #include <uapi/asm/unistd.h>
 
-
-
-#define NR_syscalls			326 /* length of syscall table */
-
 /*
  * The following defines stop scripts/checksyscalls.sh from complaining about
  * unimplemented system calls.  Glibc provides for each of these by using
diff --git a/arch/ia64/include/uapi/asm/unistd.h b/arch/ia64/include/uapi/asm/unistd.h
index 5fe71d4..52c6712 100644
--- a/arch/ia64/include/uapi/asm/unistd.h
+++ b/arch/ia64/include/uapi/asm/unistd.h
@@ -341,4 +341,6 @@
 #define __NR_preadv2			1348
 #define __NR_pwritev2			1349
 
+#define __NR_syscalls			326 /* length of syscall table */
+
 #endif /* _UAPI_ASM_IA64_UNISTD_H */
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 68362b3..f40d9fd 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -501,7 +501,7 @@ GLOBAL_ENTRY(ia64_trace_syscall)
 	adds r15=PT(R15)+16,sp			// r15 = &pt_regs.r15 (syscall #)
 	;;
 	ld8 r15=[r15]
-	mov r3=NR_syscalls - 1
+	mov r3=__NR_syscalls - 1
 	;;
 	adds r15=-1024,r15
 	movl r16=sys_call_table
@@ -1757,4 +1757,4 @@ sys_call_table:
 	data8 sys_preadv2
 	data8 sys_pwritev2
 
-	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
+	.org sys_call_table + 8*__NR_syscalls	// guard against failures to increase __NR_syscalls
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index fe742ff..2d33cff 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -834,4 +834,4 @@ fsyscall_table:
 
 	// fill in zeros for the remaining entries
 	.zero:
-	.space fsyscall_table + 8*NR_syscalls - .zero, 0
+	.space fsyscall_table + 8*__NR_syscalls - .zero, 0
diff --git a/arch/ia64/kernel/gate.S b/arch/ia64/kernel/gate.S
index 9f235cd..eeafa31 100644
--- a/arch/ia64/kernel/gate.S
+++ b/arch/ia64/kernel/gate.S
@@ -331,12 +331,12 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
 	;;
 	mov r16=IA64_KR(CURRENT)		// M2 (12 cyc)
 	shladd r18=r17,3,r14			// A
-	mov r19=NR_syscalls-1			// A
+	mov r19=__NR_syscalls-1			// A
 	;;
 	lfetch [r18]				// M0|1
 	MOV_FROM_PSR(p0, r29, r8)		// M2 (12 cyc)
 	// If r17 is a NaT, p6 will be zero
-	cmp.geu p6,p7=r19,r17			// A    (sysnr > 0 && sysnr < 1024+NR_syscalls)?
+	cmp.geu p6,p7=r19,r17			// A    (sysnr > 0 && sysnr < 1024+__NR_syscalls)?
 	;;
 	mov r21=ar.fpsr				// M2 (12 cyc)
 	tnat.nz p10,p9=r15			// I0
diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S
index 1efcbe5..93ddc00 100644
--- a/arch/ia64/kernel/ivt.S
+++ b/arch/ia64/kernel/ivt.S
@@ -763,7 +763,7 @@ ENTRY(break_fault)
 
 	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
 	adds r15=-1024,r15			// A    subtract 1024 from syscall number
-	mov r3=NR_syscalls - 1
+	mov r3=__NR_syscalls - 1
 	;;
 	ld1.bias r17=[r16]			// M0|1 r17 = current->thread.on_ustack flag
 	ld4 r9=[r9]				// M0|1 r9 = current_thread_info()->flags
diff --git a/arch/ia64/kernel/patch.c b/arch/ia64/kernel/patch.c
index 7f21a8c..d2e7e31 100644
--- a/arch/ia64/kernel/patch.c
+++ b/arch/ia64/kernel/patch.c
@@ -172,7 +172,7 @@
 static void __init
 patch_fsyscall_table (unsigned long start, unsigned long end)
 {
-	extern unsigned long fsyscall_table[NR_syscalls];
+	extern unsigned long fsyscall_table[__NR_syscalls];
 	s32 *offp = (s32 *) start;
 	u64 ip;
 
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 3b85c3e..0096be4 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -635,9 +635,9 @@ int __init register_active_ranges(u64 start, u64 len, int nid)
 	 * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
 	 * code can tell them apart.
 	 */
-	for (i = 0; i < NR_syscalls; ++i) {
-		extern unsigned long fsyscall_table[NR_syscalls];
-		extern unsigned long sys_call_table[NR_syscalls];
+	for (i = 0; i < __NR_syscalls; ++i) {
+		extern unsigned long fsyscall_table[__NR_syscalls];
+		extern unsigned long sys_call_table[__NR_syscalls];
 
 		if (!fsyscall_table[i] || nolwsys)
 			fsyscall_table[i] = sys_call_table[i] | 1;
-- 
1.9.1