diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2024-06-03 15:07:06 -0400 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-06-04 10:35:40 -0400 |
| commit | 59e5f04e4184181227889663618e01dce676e671 (patch) | |
| tree | 481e60e325affeb762ef9f8214b35aa0771f1d55 /kernel | |
| parent | function_graph: Convert ret_stack to a series of longs (diff) | |
| download | linux-59e5f04e4184181227889663618e01dce676e671.tar.gz linux-59e5f04e4184181227889663618e01dce676e671.zip | |
fgraph: Use BUILD_BUG_ON() to make sure we have structures divisible by long
Instead of using "ALIGN()", use BUILD_BUG_ON() as the structures should
always be divisible by sizeof(long).
Co-developed with Masami Hiramatsu:
Link: https://lore.kernel.org/linux-trace-kernel/171509093949.162236.14518699447151894536.stgit@devnote2
Link: http://lkml.kernel.org/r/20190524111144.GI2589@hirez.programming.kicks-ass.net
Link: https://lore.kernel.org/linux-trace-kernel/20240603190821.232168933@goodmis.org
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Florent Revest <revest@chromium.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: bpf <bpf@vger.kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alan Maguire <alan.maguire@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Guo Ren <guoren@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/fgraph.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index c62e6db718a0..fdb206aeffe3 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -33,7 +33,7 @@ * SHADOW_STACK_MAX_OFFSET: The max offset of the stack for a new frame to be added */ #define FGRAPH_FRAME_SIZE sizeof(struct ftrace_ret_stack) -#define FGRAPH_FRAME_OFFSET (ALIGN(FGRAPH_FRAME_SIZE, sizeof(long)) / sizeof(long)) +#define FGRAPH_FRAME_OFFSET DIV_ROUND_UP(FGRAPH_FRAME_SIZE, sizeof(long)) #define SHADOW_STACK_SIZE (PAGE_SIZE) #define SHADOW_STACK_OFFSET \ (ALIGN(SHADOW_STACK_SIZE, sizeof(long)) / sizeof(long)) @@ -103,6 +103,8 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, if (!current->ret_stack) return -EBUSY; + BUILD_BUG_ON(SHADOW_STACK_SIZE % sizeof(long)); + /* * We must make sure the ret_stack is tested before we read * anything else. @@ -326,6 +328,8 @@ ftrace_graph_get_ret_stack(struct task_struct *task, int idx) { int index = task->curr_ret_stack; + BUILD_BUG_ON(FGRAPH_FRAME_SIZE % sizeof(long)); + index -= FGRAPH_FRAME_OFFSET * (idx + 1); if (index < 0) return NULL; |