linux-kernel - [PATCH] modpost: Skip .llvm.call-graph-profile section check

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Message-ID: <20230822065256.163660-1-denik@chromium.org>
Date:   Mon, 21 Aug 2023 23:52:55 -0700
From:   Denis Nikitin <denik@...omium.org>
To:     linux-kbuild@...r.kernel.org
Cc:     denik@...omium.org, Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH] modpost: Skip .llvm.call-graph-profile section check

.llvm.call-graph-profile section is added when the kernel is built with
profiles (e.g. -fprofile-sample-use=<llvm.profile>). The section holds
metadata for symbols beloning to other sections and hence doesn't need
modpost checks.

This change fixes the kernel build with sample profiles which fails
with:
"FATAL: modpost: Please add code to calculate addend for this architecture"

Signed-off-by: Denis Nikitin <denik@...omium.org>
---
 scripts/mod/modpost.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index b29b29707f10..64bd13f7199c 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -761,6 +761,7 @@ static const char *const section_white_list[] =
 	".fmt_slot*",			/* EZchip */
 	".gnu.lto*",
 	".discard.*",
+	".llvm.call-graph-profile",	/* call graph */
 	NULL
 };
 
-- 
2.42.0.rc1.204.g551eb34607-goog