Shrink stack size usage

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index e032e9404dba0bb3f0f33402e78fdb5a61ff4c4e..9de3c0794ccf43f1f0add04b3c2d02a62615eb49 100644 (file)
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -271,16 +271,18 @@ void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
        }
 }
 
+/* noinline to diminish caller stack size */
 static
 int fill_table(const struct trace_syscall_entry *table, size_t table_len,
        struct ltt_event **chan_table, struct ltt_channel *chan, void *filter)
 {
+       const struct lttng_event_desc *desc;
        unsigned int i;
 
        /* Allocate events for each syscall, insert into table */
        for (i = 0; i < table_len; i++) {
                struct lttng_kernel_event ev;
-               const struct lttng_event_desc *desc = table[i].desc;
+               desc = table[i].desc;
 
                if (!desc) {
                        /* Unknown syscall */
@@ -313,6 +315,7 @@ int fill_table(const struct trace_syscall_entry *table, size_t table_len,
 
 int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
 {
+       struct lttng_kernel_event ev;
        int ret;
 
        wrapper_vmalloc_sync_all();
@@ -335,7 +338,6 @@ int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
        }
 #endif
        if (!chan->sc_unknown) {
-               struct lttng_kernel_event ev;
                const struct lttng_event_desc *desc =
                        &__event_desc___sys_unknown;
 
@@ -351,7 +353,6 @@ int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
        }
 
        if (!chan->sc_compat_unknown) {
-               struct lttng_kernel_event ev;
                const struct lttng_event_desc *desc =
                        &__event_desc___compat_sys_unknown;
 
@@ -367,7 +368,6 @@ int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
        }
 
        if (!chan->sc_exit) {
-               struct lttng_kernel_event ev;
                const struct lttng_event_desc *desc =
                        &__event_desc___exit_syscall;