sparc: unconditionally enable HAVE_COPY_THREAD_TLS

Now that both sparc and sparc64 support copy_thread_tls() and don't rely
on do_fork() anymore, turn on HAVE_COPY_THREAD_TLS unconditionally. Once
all architectures are switched over this macro will be removed and
the old do_fork() calling convention fully abandoned in favor of the
cleaner struct kernel_clone_args one.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: linux-csky@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Link: https://lore.kernel.org/r/20200512171527.570109-4-christian.brauner@ubuntu.com

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index e2bb495..66213c0 100644 (file)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -48,6 +48,7 @@ config SPARC
        select LOCKDEP_SMALL if LOCKDEP
        select NEED_DMA_MAP_STATE
        select NEED_SG_DMA_LENGTH
+       select HAVE_COPY_THREAD_TLS
 
 config SPARC32
        def_bool !64BIT
@@ -94,7 +95,6 @@ config SPARC64
        select ARCH_HAS_PTE_SPECIAL
        select PCI_DOMAINS if PCI
        select ARCH_HAS_GIGANTIC_PAGE
-       select HAVE_COPY_THREAD_TLS
 
 config ARCH_PROC_KCORE_TEXT
        def_bool y

diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 229a10b..3e1f7b6 100644 (file)
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -273,8 +273,9 @@ clone_stackframe(struct sparc_stackf __user *dst,
 extern void ret_from_fork(void);
 extern void ret_from_kernel_thread(void);
 
-int copy_thread(unsigned long clone_flags, unsigned long sp,
-               unsigned long arg, struct task_struct *p)
+int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
+                   unsigned long arg, struct task_struct *p,
+                   unsigned long tls)
 {
        struct thread_info *ti = task_thread_info(p);
        struct pt_regs *childregs, *regs = current_pt_regs();
@@ -376,7 +377,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
        regs->u_regs[UREG_I1] = 0;
 
        if (clone_flags & CLONE_SETTLS)
-               childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
+               childregs->u_regs[UREG_G7] = tls;
 
        return 0;
 }