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perf: Have get_perf_callchain() return NULL if crosstask and user are set

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[ Upstream commit 153f9e74dec230f2e070e16fa061bc7adfd2c450 ]

get_perf_callchain() doesn't support cross-task unwinding for user space
stacks, have it return NULL if both the crosstask and user arguments are
set.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250820180428.426423415@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josh Poimboeuf
2025-08-20 14:03:40 -04:00
committed by Greg Kroah-Hartman
parent 34b5aba851
commit 89fbfc799e
1 changed files with 5 additions and 5 deletions
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10
kernel/events/callchain.c
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@@ -184,6 +184,10 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
struct perf_callchain_entry_ctx ctx;
int rctx;
/* crosstask is not supported for user stacks */
if (crosstask && user && !kernel)
return NULL;
entry = get_callchain_entry(&rctx);
if (!entry)
return NULL;
@@ -200,7 +204,7 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
perf_callchain_kernel(&ctx, regs);
}
if (user) {
if (user && !crosstask) {
if (!user_mode(regs)) {
if (current->flags & (PF_KTHREAD | PF_USER_WORKER))
regs = NULL;
@@ -209,9 +213,6 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
}
if (regs) {
if (crosstask)
goto exit_put;
if (add_mark)
perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
@@ -219,7 +220,6 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
}
}
exit_put:
put_callchain_entry(rctx);
return entry;