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powerpc/signal: Call get_tm_stackpointer() from get_sigframe() 

Instead of calling get_tm_stackpointer() from the caller, call it
directly from get_sigframe(). This avoids a double call and
allows get_tm_stackpointer() to become static and be inlined
into get_sigframe() by GCC.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/abfdc105b8b28c4eb3ab9a26297d17f302b600ea.1597770847.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-08-18 17:19:22 +00:00 committed by Michael Ellerman
parent 0ecbc6ad18
commit c180cb305c
4 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/powerpc/kernel/signal.c
View File

@ -144,10 +144,13 @@ int show_unhandled_signals = 1;
/*
* Allocate space for the signal frame
*/
void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
size_t frame_size, int is_32)
static unsigned long get_tm_stackpointer(struct task_struct *tsk);
void __user *get_sigframe(struct ksignal *ksig, struct task_struct *tsk,
size_t frame_size, int is_32)
{
unsigned long oldsp, newsp;
unsigned long sp = get_tm_stackpointer(tsk);
/* Default to using normal stack */
if (is_32)
@ -300,7 +303,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
user_enter();
}
unsigned long get_tm_stackpointer(struct task_struct *tsk)
static unsigned long get_tm_stackpointer(struct task_struct *tsk)
{
/* When in an active transaction that takes a signal, we need to be
* careful with the stack. It's possible that the stack has moved back

6
arch/powerpc/kernel/signal.h
View File

@ -10,8 +10,8 @@
#ifndef _POWERPC_ARCH_SIGNAL_H
#define _POWERPC_ARCH_SIGNAL_H
extern void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
size_t frame_size, int is_32);
void __user *get_sigframe(struct ksignal *ksig, struct task_struct *tsk,
size_t frame_size, int is_32);
extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
struct task_struct *tsk);
@ -19,8 +19,6 @@ extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
extern int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
struct task_struct *tsk);
extern unsigned long get_tm_stackpointer(struct task_struct *tsk);
#ifdef CONFIG_VSX
extern unsigned long copy_vsx_to_user(void __user *to,
struct task_struct *task);

4
arch/powerpc/kernel/signal_32.c
View File

@ -766,7 +766,7 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
/* Set up Signal Frame */
/* Put a Real Time Context onto stack */
rt_sf = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*rt_sf), 1);
rt_sf = get_sigframe(ksig, tsk, sizeof(*rt_sf), 1);
addr = rt_sf;
if (!access_ok(rt_sf, sizeof(*rt_sf)))
goto badframe;
@ -1226,7 +1226,7 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
#endif
/* Set up Signal Frame */
frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 1);
frame = get_sigframe(ksig, tsk, sizeof(*frame), 1);
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
sc = (struct sigcontext __user *) &frame->sctx;

2
arch/powerpc/kernel/signal_64.c
View File

@ -822,7 +822,7 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
unsigned long msr = regs->msr;
#endif
frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 0);
frame = get_sigframe(ksig, tsk, sizeof(*frame), 0);
if (!access_ok(frame, sizeof(*frame)))
goto badframe;