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arch: remove HAVE_COPY_THREAD_TLS

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All architectures support copy_thread_tls() now, so remove the legacy
copy_thread() function and the HAVE_COPY_THREAD_TLS config option. Everyone
uses the same process creation calling convention based on
copy_thread_tls() and struct kernel_clone_args. This will make it easier to
maintain the core process creation code under kernel/, simplifies the
callpaths and makes the identical for all architectures.

Cc: linux-arch@vger.kernel.org
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Acked-by: Greentime Hu <green.hu@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2020-05-24 23:34:20 +02:00
parent 8496da092a
commit 140c8180eb
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GPG key ID: 91C61BC06578DCA2
28 changed files with 0 additions and 54 deletions
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9
kernel/fork.c
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@ -2577,15 +2577,6 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
#ifdef __ARCH_WANT_SYS_CLONE3
/*
* copy_thread implementations handle CLONE_SETTLS by reading the TLS value from
* the registers containing the syscall arguments for clone. This doesn't work
* with clone3 since the TLS value is passed in clone_args instead.
*/
#ifndef CONFIG_HAVE_COPY_THREAD_TLS
#error clone3 requires copy_thread_tls support in arch
#endif
noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
struct clone_args __user *uargs,
size_t usize)