On Thu, Jan 10, 2019 at 05:24:27PM +0100, Arnd Bergmann wrote: > A couple of architectures including arm64 already implement the > kexec_file_load system call, on many others we have assigned a system > call number for it, but not implemented it yet. > > Adding the number in arch/arm/ lets us use the system call on arm64 > systems in compat mode, and also reduces the number of differences > between architectures. If we want to implement kexec_file_load on ARM > in the future, the number assignment means that kexec tools can already > be built with the now current set of kernel headers. > > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > --- > arch/arm/tools/syscall.tbl | 1 + > arch/arm64/include/asm/unistd.h | 2 +- > arch/arm64/include/asm/unistd32.h | 2 ++ > 3 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl > index 86de9eb34296..20ed7e026723 100644 > --- a/arch/arm/tools/syscall.tbl > +++ b/arch/arm/tools/syscall.tbl > @@ -415,3 +415,4 @@ > 398 common rseq sys_rseq > 399 common io_pgetevents sys_io_pgetevents > 400 common migrate_pages sys_migrate_pages > +401 common kexec_file_load sys_kexec_file_load > diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h > index 261216c3336e..2c30e6f145ff 100644 > --- a/arch/arm64/include/asm/unistd.h > +++ b/arch/arm64/include/asm/unistd.h > @@ -44,7 +44,7 @@ > #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5) > #define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800) > > -#define __NR_compat_syscalls 401 > +#define __NR_compat_syscalls 402 > #endif > > #define __ARCH_WANT_SYS_CLONE > diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h > index 355fe2bc035b..19f3f58b6146 100644 > --- a/arch/arm64/include/asm/unistd32.h > +++ b/arch/arm64/include/asm/unistd32.h > @@ -823,6 +823,8 @@ __SYSCALL(__NR_rseq, sys_rseq) > __SYSCALL(__NR_io_pgetevents, compat_sys_io_pgetevents) > #define __NR_migrate_pages 400 > __SYSCALL(__NR_migrate_pages, sys_migrate_pages) > +#define __NR_kexec_file_load 401 > +__SYSCALL(__NR_kexec_file_load, sys_kexec_file_load) Hmm, I wonder if we need a compat wrapper for this, or are we assuming that the early entry code has already zero-extended the long and pointer arguments? Will
