path: root/fs
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2019-04-05 13:15:57 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2019-04-05 13:15:57 -1000
commit970b766cfd3f3cb7275bf51144b1678c547882fc (patch)
treea849cc6dd0f74f412a2c6ee5ceb9443d11221a56 /fs
parent7f46774c6480174eb869a3c15167eafac467a6af (diff)
parent32d92586629a8b3637a3c9361709818e25f327ad (diff)
Merge tag 'trace-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull syscall-get-arguments cleanup and fixes from Steven Rostedt: "Andy Lutomirski approached me to tell me that the syscall_get_arguments() implementation in x86 was horrible and gcc certainly gets it wrong. He said that since the tracepoints only pass in 0 and 6 for i and n repectively, it should be optimized for that case. Inspecting the kernel, I discovered that all users pass in 0 for i and only one file passing in something other than 6 for the number of arguments. That code happens to be my own code used for the special syscall tracing. That can easily be converted to just using 0 and 6 as well, and only copying what is needed. Which is probably the faster path anyway for that case. Along the way, a couple of real fixes came from this as the syscall_get_arguments() function was incorrect for csky and riscv. x86 has been optimized to for the new interface that removes the variable number of arguments, but the other architectures could still use some loving and take more advantage of the simpler interface" * tag 'trace-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: syscalls: Remove start and number from syscall_set_arguments() args syscalls: Remove start and number from syscall_get_arguments() args csky: Fix syscall_get_arguments() and syscall_set_arguments() riscv: Fix syscall_get_arguments() and syscall_set_arguments() tracing/syscalls: Pass in hardcoded 6 into syscall_get_arguments() ptrace: Remove maxargs from task_current_syscall()
Diffstat (limited to 'fs')
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ddef482f1334..6a803a0b75df 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -616,24 +616,25 @@ static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
- long nr;
- unsigned long args[6], sp, pc;
+ struct syscall_info info;
+ u64 *args = &info.data.args[0];
int res;
res = lock_trace(task);
if (res)
return res;
- if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
+ if (task_current_syscall(task, &info))
seq_puts(m, "running\n");
- else if (nr < 0)
- seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
+ else if (info.data.nr < 0)
+ seq_printf(m, "%d 0x%llx 0x%llx\n",
+ info.data.nr, info.sp, info.data.instruction_pointer);
- "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
- nr,
+ "%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n",
+ info.data.nr,
args[0], args[1], args[2], args[3], args[4], args[5],
- sp, pc);
+ info.sp, info.data.instruction_pointer);
return 0;