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[2/3] bpf/trampoline: Allow ftrace location to differ from trampoline attach address

Message ID 2a32e4723f7e56c675ffd6aa0762789e56dce2e1.1645096227.git.naveen.n.rao@linux.vnet.ibm.com (mailing list archive)
State Changes Requested
Headers show
Series powerpc/ftrace: Reserve instructions from function entry for ftrace | expand

Commit Message

Naveen N. Rao Feb. 17, 2022, 11:36 a.m. UTC 
On some architectures, ftrace location can include multiple
instructions, and does not necessarily match the function entry address
returned by kallsyms_lookup(). Drop the check in is_ftrace_location() to
accommodate the same.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 kernel/bpf/trampoline.c | 2 --
 1 file changed, 2 deletions(-)
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Patch

diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index 4b6974a195c138..c47c80874bee3f 100644
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -124,8 +124,6 @@  static int is_ftrace_location(void *ip)
 	addr = ftrace_location((long)ip);
 	if (!addr)
 		return 0;
-	if (WARN_ON_ONCE(addr != (long)ip))
-		return -EFAULT;
 	return 1;
 }