github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-31 02:24:24 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

kernel: ftrace: export ftrace_sync_ipi

Browse Source 
The following ftrace patch for riscv uses a data store to update ftrace
function. Therefore, a romote fence is required to order it against
function_trace_op updates. The mechanism is similar to the fence between
function_trace_op and update_ftrace_func in the generic ftrace, so we
leverage the same ftrace_sync_ipi function.

[ alex: Fix build warning when !CONFIG_DYNAMIC_FTRACE ]

Signed-off-by: Andy Chiu <andybnac@gmail.com>
Link: https://lore.kernel.org/r/20250407180838.42877-4-andybnac@gmail.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
This commit is contained in:
Andy Chiu 2025-04-08 02:08:28 +08:00 committed by Palmer Dabbelt
parent c41bf4326c
commit 500e626c4a
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
2 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/ftrace.h
View File

@ -635,6 +635,8 @@ enum {
#define ftrace_get_symaddr(fentry_ip) (0)
#endif
void ftrace_sync_ipi(void *data);
#ifdef CONFIG_DYNAMIC_FTRACE
void ftrace_arch_code_modify_prepare(void);

2
kernel/trace/ftrace.c
View File

@ -188,7 +188,7 @@ static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
op->saved_func(ip, parent_ip, op, fregs);
}
static void ftrace_sync_ipi(void *data)
void ftrace_sync_ipi(void *data)
{
/* Probably not needed, but do it anyway */
smp_rmb();