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kernel: ftrace: export ftrace_sync_ipi

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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
2 changed files with 3 additions and 1 deletions
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2
include/linux/ftrace.h
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@@ -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);