Patch "riscv: Implement copy_thread_tls" has been added to the 5.4-stable tree

Patch "riscv: Implement copy_thread_tls" has been added to the 5.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    riscv: Implement copy_thread_tls

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     riscv-implement-copy_thread_tls.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 20bda4ed62f507ed72e30e817b43c65fdba60be7 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Thu, 2 Jan 2020 18:24:11 +0100
Subject: riscv: Implement copy_thread_tls

From: Amanieu d'Antras <amanieu@gmail.com>

commit 20bda4ed62f507ed72e30e817b43c65fdba60be7 upstream.

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: linux-riscv@lists.infradead.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-6-amanieu@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/riscv/Kconfig          |    1 +
 arch/riscv/kernel/process.c |    6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -61,6 +61,7 @@ config RISCV
 	select SPARSEMEM_STATIC if 32BIT
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select HAVE_ARCH_MMAP_RND_BITS
+	select HAVE_COPY_THREAD_TLS
 
 config ARCH_MMAP_RND_BITS_MIN
 	default 18 if 64BIT
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -99,8 +99,8 @@ int arch_dup_task_struct(struct task_str
 	return 0;
 }
 
-int copy_thread(unsigned long clone_flags, unsigned long usp,
-	unsigned long arg, struct task_struct *p)
+int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
+	unsigned long arg, struct task_struct *p, unsigned long tls)
 {
 	struct pt_regs *childregs = task_pt_regs(p);
 
@@ -120,7 +120,7 @@ int copy_thread(unsigned long clone_flag
 		if (usp) /* User fork */
 			childregs->sp = usp;
 		if (clone_flags & CLONE_SETTLS)
-			childregs->tp = childregs->a5;
+			childregs->tp = tls;
 		childregs->a0 = 0; /* Return value of fork() */
 		p->thread.ra = (unsigned long)ret_from_fork;
 	}


Patches currently in stable-queue which might be from amanieu@gmail.com are

queue-5.4/arm-implement-copy_thread_tls.patch
queue-5.4/arm64-implement-copy_thread_tls.patch
queue-5.4/xtensa-implement-copy_thread_tls.patch
queue-5.4/arm64-move-__arch_want_sys_clone3-definition-to-uapi-headers.patch
queue-5.4/parisc-implement-copy_thread_tls.patch
queue-5.4/clone3-ensure-copy_thread_tls-is-implemented.patch
queue-5.4/riscv-implement-copy_thread_tls.patch
queue-5.4/um-implement-copy_thread_tls.patch