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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-11 11:34:25 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-25 18:08:51 +0200 |
| commit | 819671ff849b07b9831b91de879ddc5da4b333d4 (patch) | |
| tree | 0d2e9bb2765af669be7e29f00fe48b30261cdbc3 /include/linux/syscalls.h | |
| parent | 0c8efd610b58cb23cefdfa12015799079aef94ae (diff) | |
| download | lwn-819671ff849b07b9831b91de879ddc5da4b333d4.tar.gz lwn-819671ff849b07b9831b91de879ddc5da4b333d4.zip | |
syscalls: define and explain goal to not call syscalls in the kernel
The syscall entry points to the kernel defined by SYSCALL_DEFINEx()
and COMPAT_SYSCALL_DEFINEx() should only be called from userspace
through kernel entry points, but not from the kernel itself. This
will allow cleanups and optimizations to the entry paths *and* to
the parts of the kernel code which currently need to pretend to be
userspace in order to make use of syscalls.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'include/linux/syscalls.h')
| -rw-r--r-- | include/linux/syscalls.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index a78186d826d7..0526286a0314 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -941,4 +941,11 @@ asmlinkage long sys_pkey_free(int pkey); asmlinkage long sys_statx(int dfd, const char __user *path, unsigned flags, unsigned mask, struct statx __user *buffer); + +/* + * Kernel code should not call syscalls (i.e., sys_xyzyyz()) directly. + * Instead, use one of the functions which work equivalently, such as + * the ksys_xyzyyz() functions prototyped below. + */ + #endif |