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kill signal_pt_regs()

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Once upon at it was used on hot paths, but that had not been
true since 2013.  IOW, there's no point for arch-optimized
equivalent of task_pt_regs(current) - remaining two users are
not worth bothering with.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-08 12:21:07 -04:00
parent 9abf2313ad
commit 6a542d1d5f
4 changed files with 2 additions and 12 deletions
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1
arch/alpha/include/asm/ptrace.h
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@ -16,7 +16,6 @@
#define current_pt_regs() \
((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1)
#define signal_pt_regs current_pt_regs
#define force_successful_syscall_return() (current_pt_regs()->r0 = 0)

2
fs/coredump.c
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@ -525,7 +525,7 @@ void do_coredump(const kernel_siginfo_t *siginfo)
static atomic_t core_dump_count = ATOMIC_INIT(0);
struct coredump_params cprm = {
.siginfo = siginfo,
.regs = signal_pt_regs(),
.regs = task_pt_regs(current),
.limit = rlimit(RLIMIT_CORE),
/*
* We must use the same mm->flags while dumping core to avoid

9
include/linux/ptrace.h
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@ -389,15 +389,6 @@ static inline void user_single_step_report(struct pt_regs *regs)
#define current_pt_regs() task_pt_regs(current)
#endif
/*
* unlike current_pt_regs(), this one is equal to task_pt_regs(current)
* on *all* architectures; the only reason to have a per-arch definition
* is optimisation.
*/
#ifndef signal_pt_regs
#define signal_pt_regs() task_pt_regs(current)
#endif
#ifndef current_user_stack_pointer
#define current_user_stack_pointer() user_stack_pointer(current_pt_regs())
#endif

2
kernel/signal.c
View File

@ -1255,7 +1255,7 @@ int send_signal_locked(int sig, struct kernel_siginfo *info,
static void print_fatal_signal(int signr)
{
struct pt_regs *regs = signal_pt_regs();
struct pt_regs *regs = task_pt_regs(current);
pr_info("potentially unexpected fatal signal %d.\n", signr);
#if defined(__i386__) && !defined(__arch_um__)