Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Firoz Khan <firoz.khan@linaro.org>
To:     Michal Simek <monstr@monstr.eu>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        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 1/3] microblaze: move __NR_syscalls macro from asm/unistd.h
Date:   Tue, 13 Nov 2018 11:34:32 +0530
Message-Id: <1542089074-20027-2-git-send-email-firoz.khan@linaro.org>
In-Reply-To: <1542089074-20027-1-git-send-email-firoz.khan@linaro.org>
References: <1542089074-20027-1-git-send-email-firoz.khan@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

__NR_syscalls holds the number of system call exist in
microblaze architecture. 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 total number of system
calls information. So we have two option to update __NR-
_syscalls value.

1. Update __NR_syscalls in asm/unistd.h manually by count-
   ing the no.of system calls. No need to update NR_sys-
   calls until we either add a new system call or delete
   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 generated file. In this case we don't need to expli-
   citly 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. While __NR_syscalls 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/microblaze/include/asm/unistd.h      | 2 --
 arch/microblaze/include/uapi/asm/unistd.h | 4 ++++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h
index f42c40f..9b7c2c4 100644
--- a/arch/microblaze/include/asm/unistd.h
+++ b/arch/microblaze/include/asm/unistd.h
@@ -38,6 +38,4 @@
 
 #endif /* __ASSEMBLY__ */
 
-#define __NR_syscalls         401
-
 #endif /* _ASM_MICROBLAZE_UNISTD_H */
diff --git a/arch/microblaze/include/uapi/asm/unistd.h b/arch/microblaze/include/uapi/asm/unistd.h
index 7a9f16a..1c3f867 100644
--- a/arch/microblaze/include/uapi/asm/unistd.h
+++ b/arch/microblaze/include/uapi/asm/unistd.h
@@ -418,4 +418,8 @@
 #define __NR_io_pgetevents	399
 #define __NR_rseq		400
 
+#ifdef __KERNEL__
+#define __NR_syscalls		401
+#endif
+
 #endif /* _UAPI_ASM_MICROBLAZE_UNISTD_H */
-- 
1.9.1