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authorSteven Rostedt <rostedt@goodmis.org>2017-06-26 18:17:49 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-06-27 11:01:26 -0400
commitfbb789f0d631473585d17afb120d07561d329689 (patch)
tree8caafd1649ac1fd05b2d37f2f8a08c81b8bbc06b /arch/sh
parent8c08f0d5c6fb10ff93ffb1cbf416f4f1c3a52a80 (diff)
downloadlinux-fbb789f0d631473585d17afb120d07561d329689.tar.bz2
sh/ftrace: Remove only user of ftrace_arch_read_dyn_info()
I noticed that there's only one user of ftrace_arch_read_dyn_info(). That was used a while ago during the NMI updating in x86, and superh copied it to implement its version of handling NMIs during stop_machine(). But that is a debug feature, and this code hasn't been touched since 2009. Also, x86 no longer does the ftrace updates with stop_machine() and instead uses breakpoints. If superh needs to modify its code, it should implement the breakpoint conversion, and remove stop_machine(). Which also gets rid of the NMI issue. Anyway, I want to nuke ftrace_arch_read_dyn_info() and this gets rid of the one user, which is for an arch that shouldn't need it anymore. Link: http://lkml.kernel.org/r/20170626181749.2ce954d1@gandalf.local.home Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: linux-sh@vger.kernel.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/ftrace.c18
1 files changed, 0 insertions, 18 deletions
diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
index 53783978162e..d18724d186f3 100644
--- a/arch/sh/kernel/ftrace.c
+++ b/arch/sh/kernel/ftrace.c
@@ -96,19 +96,6 @@ static int mod_code_status; /* holds return value of text write */
static void *mod_code_ip; /* holds the IP to write to */
static void *mod_code_newcode; /* holds the text to write to the IP */
-static unsigned nmi_wait_count;
-static atomic_t nmi_update_count = ATOMIC_INIT(0);
-
-int ftrace_arch_read_dyn_info(char *buf, int size)
-{
- int r;
-
- r = snprintf(buf, size, "%u %u",
- nmi_wait_count,
- atomic_read(&nmi_update_count));
- return r;
-}
-
static void clear_mod_flag(void)
{
int old = atomic_read(&nmi_running);
@@ -144,7 +131,6 @@ void arch_ftrace_nmi_enter(void)
if (atomic_inc_return(&nmi_running) & MOD_CODE_WRITE_FLAG) {
smp_rmb();
ftrace_mod_code();
- atomic_inc(&nmi_update_count);
}
/* Must have previous changes seen before executions */
smp_mb();
@@ -165,8 +151,6 @@ static void wait_for_nmi_and_set_mod_flag(void)
do {
cpu_relax();
} while (atomic_cmpxchg(&nmi_running, 0, MOD_CODE_WRITE_FLAG));
-
- nmi_wait_count++;
}
static void wait_for_nmi(void)
@@ -177,8 +161,6 @@ static void wait_for_nmi(void)
do {
cpu_relax();
} while (atomic_read(&nmi_running));
-
- nmi_wait_count++;
}
static int