| Message ID | 1542169930-24118-2-git-send-email-firoz.khan@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | sh: system call table generation support | expand |
On Wed, Nov 14, 2018 at 5:32 AM Firoz Khan <firoz.khan@linaro.org> wrote: > > NR_syscalls macro holds the number of system call exist > in sh 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_sy- > scalls 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 > added the __NR_syscalls macro in uapi/asm/unistd_32/64.h > along with NR_syscalls which is moved 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> Looks correct to me, but since there are only three references to 'NR_syscalls' in arch/sh, I wonder if we should just replace it with __NR_syscalls in the same patch. Arnd
Hi Arnd, On Mon, 19 Nov 2018 at 22:21, Arnd Bergmann <arnd@arndb.de> wrote: > > On Wed, Nov 14, 2018 at 5:32 AM Firoz Khan <firoz.khan@linaro.org> wrote: > > > > NR_syscalls macro holds the number of system call exist > > in sh 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_sy- > > scalls 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 > > added the __NR_syscalls macro in uapi/asm/unistd_32/64.h > > along with NR_syscalls which is moved 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> > > Looks correct to me, but since there are only three references to > 'NR_syscalls' in arch/sh, I wonder if we should just replace it with > __NR_syscalls in the same patch. This is the approach I had initially, But someone pointed out that doing this way - #define NR_syscalls __NR_syscalls would be better. The only difference is here the number of occurrence 3 and there 5-7 occurrence of NR_syscalls. Thanks Firoz > > Arnd
diff --git a/arch/sh/include/asm/unistd.h b/arch/sh/include/asm/unistd.h index a99234b..a97f93c 100644 --- a/arch/sh/include/asm/unistd.h +++ b/arch/sh/include/asm/unistd.h @@ -5,6 +5,8 @@ # include <asm/unistd_64.h> # endif +#define NR_syscalls __NR_syscalls + # define __ARCH_WANT_NEW_STAT # define __ARCH_WANT_OLD_READDIR # define __ARCH_WANT_OLD_STAT diff --git a/arch/sh/include/uapi/asm/unistd_32.h b/arch/sh/include/uapi/asm/unistd_32.h index 58f04cf..31c85aa 100644 --- a/arch/sh/include/uapi/asm/unistd_32.h +++ b/arch/sh/include/uapi/asm/unistd_32.h @@ -396,6 +396,8 @@ #define __NR_preadv2 381 #define __NR_pwritev2 382 -#define NR_syscalls 383 +#ifdef __KERNEL__ +#define __NR_syscalls 383 +#endif #endif /* __ASM_SH_UNISTD_32_H */ diff --git a/arch/sh/include/uapi/asm/unistd_64.h b/arch/sh/include/uapi/asm/unistd_64.h index 6f809a5..75da548 100644 --- a/arch/sh/include/uapi/asm/unistd_64.h +++ b/arch/sh/include/uapi/asm/unistd_64.h @@ -416,6 +416,8 @@ #define __NR_preadv2 392 #define __NR_pwritev2 393 -#define NR_syscalls 394 +#ifdef __KERNEL__ +#define __NR_syscalls 394 +#endif #endif /* __ASM_SH_UNISTD_64_H */
NR_syscalls macro holds the number of system call exist in sh 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_sy- scalls 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 added the __NR_syscalls macro in uapi/asm/unistd_32/64.h along with NR_syscalls which is moved 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/sh/include/asm/unistd.h | 2 ++ arch/sh/include/uapi/asm/unistd_32.h | 4 +++- arch/sh/include/uapi/asm/unistd_64.h | 4 +++- 3 files changed, 8 insertions(+), 2 deletions(-)