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fgraph: Use BUILD_BUG_ON() to make sure we have structures divisible by long

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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>
This commit is contained in:
Steven Rostedt (VMware) 2024-06-03 15:07:06 -04:00 committed by Steven Rostedt (Google)
parent 42675b723b
commit 59e5f04e41
1 changed files with 5 additions and 1 deletions
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6
kernel/trace/fgraph.c
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@ -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;