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alpha: switch to copy_thread_tls() 

Use the copy_thread_tls() calling convention which passes tls through a
register. This is required so we can remove the copy_thread{_tls}() split
and remove the HAVE_COPY_THREAD_TLS macro.

Cc: linux-alpha@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2020-05-24 21:39:53 +02:00
parent ff2a91127b
commit 0fdfc53f24
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 5 additions and 5 deletions
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1
arch/alpha/Kconfig
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@ -38,6 +38,7 @@ config ALPHA
select OLD_SIGSUSPEND select OLD_SIGSUSPEND
select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
select MMU_GATHER_NO_RANGE select MMU_GATHER_NO_RANGE
select HAVE_COPY_THREAD_TLS
help help
The Alpha is a 64-bit general-purpose processor designed and The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory, marketed by the Digital Equipment Corporation of blessed memory,

9
arch/alpha/kernel/process.c
View File

@ -233,10 +233,9 @@ release_thread(struct task_struct *dead_task)
/* /*
* Copy architecture-specific thread state * Copy architecture-specific thread state
*/ */
int int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long kthread_arg, struct task_struct *p,
unsigned long kthread_arg, unsigned long tls)
struct task_struct *p)
{ {
extern void ret_from_fork(void); extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void); extern void ret_from_kernel_thread(void);
@ -267,7 +266,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
required for proper operation in the case of a threaded required for proper operation in the case of a threaded
application calling fork. */ application calling fork. */
if (clone_flags & CLONE_SETTLS) if (clone_flags & CLONE_SETTLS)
childti->pcb.unique = regs->r20; childti->pcb.unique = tls;
else else
regs->r20 = 0; /* OSF/1 has some strange fork() semantics. */ regs->r20 = 0; /* OSF/1 has some strange fork() semantics. */
childti->pcb.usp = usp ?: rdusp(); childti->pcb.usp = usp ?: rdusp();