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authorMichael Ellerman <mpe@ellerman.id.au>2014-06-17 06:15:34 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-06-24 04:05:41 (GMT)
commitb7b348c682fac04cade7b860c49d4a17f158dad4 (patch)
tree04bad7718ceab3cf4a6f6479a0295f4bfedab8e7 /arch/powerpc
parentdfc382a19a2478768ef09d1c745b116e4fca9b4e (diff)
downloadlinux-b7b348c682fac04cade7b860c49d4a17f158dad4.tar.xz
powerpc/ftrace: Fix inverted check of create_branch()
In commit 24a1bdc35, "Fix ABIv2 issues with __ftrace_make_call", Anton changed the logic that creates and patches the branch, and added a thinko in the check of create_branch(). create_branch() returns the instruction that was generated, so if we get zero then it succeeded. The result is we can't ftrace modules: Branch out of range WARNING: at ../kernel/trace/ftrace.c:1638 ftrace failed to modify [<d000000004ba001c>] fuse_req_init_context+0x1c/0x90 [fuse] We should probably fix patch_instruction() to do that check and make the API saner, but that's a separate patch. For now just invert the test. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/ftrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index f5d1a34..8fc0c17 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -320,7 +320,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
}
/* Ensure branch is within 24 bits */
- if (create_branch(ip, rec->arch.mod->arch.tramp, BRANCH_SET_LINK)) {
+ if (!create_branch(ip, rec->arch.mod->arch.tramp, BRANCH_SET_LINK)) {
printk(KERN_ERR "Branch out of range");
return -EINVAL;
}