diff mbox series

[10/15] csky, hexagon: fix broken sys_sync_file_range

Message ID 20240620162316.3674955-11-arnd@kernel.org
State New
Headers show
Series linux system call fixes | expand

Commit Message

Arnd Bergmann June 20, 2024, 4:23 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

Both of these architectures require u64 function arguments to be
passed in even/odd pairs of registers or stack slots, which in case of
sync_file_range would result in a seven-argument system call that is
not currently possible. The system call is therefore incompatible with
all existing binaries.

While it would be possible to implement support for seven arguments
like on mips, it seems better to use a six-argument version, either
with the normal argument order but misaligned as on most architectures
or with the reordered sync_file_range2() calling conventions as on
arm and powerpc.

Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/csky/include/uapi/asm/unistd.h    | 1 +
 arch/hexagon/include/uapi/asm/unistd.h | 1 +
 2 files changed, 2 insertions(+)

Comments

Guo Ren June 23, 2024, 5:10 p.m. UTC | #1 
On Fri, Jun 21, 2024 at 12:24 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> Both of these architectures require u64 function arguments to be
> passed in even/odd pairs of registers or stack slots, which in case of
> sync_file_range would result in a seven-argument system call that is
> not currently possible. The system call is therefore incompatible with
> all existing binaries.
>
> While it would be possible to implement support for seven arguments
> like on mips, it seems better to use a six-argument version, either
> with the normal argument order but misaligned as on most architectures
> or with the reordered sync_file_range2() calling conventions as on
> arm and powerpc.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/csky/include/uapi/asm/unistd.h    | 1 +
>  arch/hexagon/include/uapi/asm/unistd.h | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/csky/include/uapi/asm/unistd.h b/arch/csky/include/uapi/asm/unistd.h
> index 7ff6a2466af1..e0594b6370a6 100644
> --- a/arch/csky/include/uapi/asm/unistd.h
> +++ b/arch/csky/include/uapi/asm/unistd.h
> @@ -6,6 +6,7 @@
>  #define __ARCH_WANT_SYS_CLONE3
>  #define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2
For csky part.
Acked-by: Guo Ren <guoren@kernel.org>

>  #include <asm-generic/unistd.h>
>
>  #define __NR_set_thread_area   (__NR_arch_specific_syscall + 0)
> diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
> index 432c4db1b623..21ae22306b5d 100644
> --- a/arch/hexagon/include/uapi/asm/unistd.h
> +++ b/arch/hexagon/include/uapi/asm/unistd.h
> @@ -36,5 +36,6 @@
>  #define __ARCH_WANT_SYS_VFORK
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2
>
>  #include <asm-generic/unistd.h>
> --
> 2.39.2
>
diff mbox series

Patch

diff --git a/arch/csky/include/uapi/asm/unistd.h b/arch/csky/include/uapi/asm/unistd.h
index 7ff6a2466af1..e0594b6370a6 100644
--- a/arch/csky/include/uapi/asm/unistd.h
+++ b/arch/csky/include/uapi/asm/unistd.h
@@ -6,6 +6,7 @@ 
 #define __ARCH_WANT_SYS_CLONE3
 #define __ARCH_WANT_SET_GET_RLIMIT
 #define __ARCH_WANT_TIME32_SYSCALLS
+#define __ARCH_WANT_SYNC_FILE_RANGE2
 #include <asm-generic/unistd.h>
 
 #define __NR_set_thread_area	(__NR_arch_specific_syscall + 0)
diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
index 432c4db1b623..21ae22306b5d 100644
--- a/arch/hexagon/include/uapi/asm/unistd.h
+++ b/arch/hexagon/include/uapi/asm/unistd.h
@@ -36,5 +36,6 @@ 
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_TIME32_SYSCALLS
+#define __ARCH_WANT_SYNC_FILE_RANGE2
 
 #include <asm-generic/unistd.h>