linux-kernel - [PATCH 4.4 86/86] Makefile: disallow data races on gcc-10 as well

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Message-Id: <20200518173507.969280760@linuxfoundation.org>
Date:   Mon, 18 May 2020 19:36:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sergei Trofimovich <slyfox@...too.org>,
        Jiri Kosina <jkosina@...e.cz>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Thomas Backlund <tmb@...eia.org>
Subject: [PATCH 4.4 86/86] Makefile: disallow data races on gcc-10 as well

From: Sergei Trofimovich <slyfox@...too.org>

commit b1112139a103b4b1101d0d2d72931f2d33d8c978 upstream.

gcc-10 will rename --param=allow-store-data-races=0
to -fno-allow-store-data-races.

The flag change happened at https://gcc.gnu.org/PR92046.

Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
Acked-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Cc: Thomas Backlund <tmb@...eia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 Makefile |    1 +
 1 file changed, 1 insertion(+)

--- a/Makefile
+++ b/Makefile
@@ -650,6 +650,7 @@ endif
 
 # Tell gcc to never replace conditional load with a non-conditional one
 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
+KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
 
 # check for 'asm goto'
 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)