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From:   Firoz Khan <firoz.khan@linaro.org>
To:     linux-parisc@vger.kernel.org,
        "James E . J . Bottomley" <jejb@parisc-linux.org>,
        Helge Deller <deller@gmx.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Kate Stewart <kstewart@linuxfoundation.org>
Cc:     y2038@lists.linaro.org, linux-kernel@vger.kernel.org,
        linux-arch@vger.kernel.org, arnd@arndb.de, deepa.kernel@gmail.com,
        marcin.juszkiewicz@linaro.org, firoz.khan@linaro.org
Subject: [PATCH v4 2/6] parisc: add __NR_Linux_syscalls along with __NR_syscalls
Date:   Fri, 12 Oct 2018 15:13:58 +0530
Message-Id: <1539337442-3676-3-git-send-email-firoz.khan@linaro.org>
In-Reply-To: <1539337442-3676-1-git-send-email-firoz.khan@linaro.org>
References: <1539337442-3676-1-git-send-email-firoz.khan@linaro.org>
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__NR_Linux_syscalls macro holds the number of system call
exist in PARISC architecture. This macro is currently the
part of uapi/asm/unistd.h file. We have to change the value
of __NR_Linux_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 inform-
ation. So we have two option to update __NR_Linux_syscalls
value.

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

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

The 2nd option will be the recommended one. For that, I moved
the __NR_Linux_syscalls macro from uapi/asm/unistd.h to asm/
unistd.h. The macro __NR_syscalls also added for making the
name convention same across all architecture. While __NR_sys-
calls isn't strictly part of the uapi, having it as part of
the generated header to simplifies the implementation. We also
need to enclose this macro with #ifdef __KERNEL__ to avoid
side effects.

Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
---
 arch/parisc/include/asm/unistd.h      | 2 ++
 arch/parisc/include/uapi/asm/unistd.h | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index 93fd9f6..d30fdbcb 100644
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
@@ -4,6 +4,8 @@
 
 #include <uapi/asm/unistd.h>
 
+#define __NR_Linux_syscalls     __NR_syscalls
+
 #ifndef __ASSEMBLY__
 
 #define SYS_ify(syscall_name)   __NR_##syscall_name
diff --git a/arch/parisc/include/uapi/asm/unistd.h b/arch/parisc/include/uapi/asm/unistd.h
index bb52e12..f10d065 100644
--- a/arch/parisc/include/uapi/asm/unistd.h
+++ b/arch/parisc/include/uapi/asm/unistd.h
@@ -366,7 +366,9 @@
 #define __NR_statx		(__NR_Linux + 349)
 #define __NR_io_pgetevents	(__NR_Linux + 350)
 
-#define __NR_Linux_syscalls	(__NR_io_pgetevents + 1)
+#ifdef __KERNEL__
+#define __NR_syscalls           351
+#endif
 
 #define LINUX_GATEWAY_ADDR      0x100
 
-- 
1.9.1