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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:42 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:16:06 +0300
commit9b32105ec6b13d32d5db6a6e7992c97ce54b5ea7 (patch)
treec3a07615fb95216020d87c65638c55deb47b45ac /kernel
parent70f68ee81e2e9ad5105b8d2bd324e890e94c6ad9 (diff)
downloadlinux-9b32105ec6b13d32d5db6a6e7992c97ce54b5ea7.tar.xz
kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()
Using this helper allows us to avoid the in-kernel calls to the sys_unshare() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_unshare(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index b1e031aac9db..f71b67dc156d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2354,7 +2354,7 @@ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp
* constructed. Here we are modifying the current, active,
* task_struct.
*/
-SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
+int ksys_unshare(unsigned long unshare_flags)
{
struct fs_struct *fs, *new_fs = NULL;
struct files_struct *fd, *new_fd = NULL;
@@ -2470,6 +2470,11 @@ bad_unshare_out:
return err;
}
+SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
+{
+ return ksys_unshare(unshare_flags);
+}
+
/*
* Helper to unshare the files of the current task.
* We don't want to expose copy_files internals to