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Date:   Tue, 10 Aug 2021 19:29:30 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, "H. Nikolaus Schaller" <>,
        Masahiro Yamada <>,
        Sasha Levin <>
Subject: [PATCH 5.13 062/175] mips: Fix non-POSIX regexp

From: H. Nikolaus Schaller <>

[ Upstream commit 28bbbb9875a35975904e46f9b06fa689d051b290 ]

When cross compiling a MIPS kernel on a BSD based HOSTCC leads
to errors like

  SYNC    include/config/auto.conf.cmd - due to: .config
egrep: empty (sub)expression
  UPD     include/config/kernel.release
  HOSTCC  scripts/dtc/dtc.o - due to target missing

It turns out that egrep uses this egrep pattern:


This is not valid syntax or gives undefined results according
to POSIX 9.5.3 ERE Grammar

It seems to be silently accepted by the Linux egrep implementation
while a BSD host complains.

Such patterns can be replaced by a transformation like

	"(|p1|p2)" -> "(p1|p2)?"

Fixes: 48c35b2d245f ("[MIPS] There is no __GNUC_MAJOR__")
Signed-off-by: H. Nikolaus Schaller <>
Signed-off-by: Masahiro Yamada <>
Signed-off-by: Sasha Levin <>
 arch/mips/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 258234c35a09..674f68d16a73 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -321,7 +321,7 @@ KBUILD_LDFLAGS		+= -m $(ld-emul)
 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
-	egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \
+	egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')

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