[PATCH] compiler-clang: remove version check for BPF Tracing

[Nick Desaulniers]

bpftrace parses the kernel headers and uses Clang under the hood. Remove
the version check when __BPF_TRACING__ is defined (as bpftrace does) so
that this tool can continue to parse kernel headers, even with older
clang sources.

Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: commit 1f7a44f63e6c ("compiler-clang: add build check for clang 10.0.1")
Reported-by: Chen Yu <yu.chen.surf@xxxxxxxxx>
Reported-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
---
 include/linux/compiler-clang.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index dd7233c48bf3..98cff1b4b088 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -8,8 +8,10 @@
 		     + __clang_patchlevel__)
 
 #if CLANG_VERSION < 100001
+#ifndef __BPF_TRACING__
 # error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
 #endif
+#endif
 
 /* Compiler specific definitions for Clang compiler */
 
-- 
2.29.1.341.ge80a0c044ae-goog