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McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, Willy Tarreau , "Paul E . McKenney" Subject: [PATCH tip/core/rcu 8/8] rcutorture: Make use of nolibc when available Date: Sun, 11 Nov 2018 12:01:43 -0800 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181111200127.GA9511@linux.ibm.com> References: <20181111200127.GA9511@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111120-0040-0000-0000-0000049089E5 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010028; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01116025; UDB=6.00577119; IPR=6.00896125; MB=3.00024114; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-11 20:01:48 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111120-0041-0000-0000-000008999293 Message-Id: <20181111200143.10177-8-paulmck@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-11_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811110191 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Willy Tarreau This reduces the size of the init executable from ~800 kB to ~800 bytes on x86_64. This is only implemented for x86_64, i386, arm and arm64. Others not tested. Signed-off-by: Willy Tarreau Signed-off-by: Paul E. McKenney --- .../selftests/rcutorture/bin/mkinitrd.sh | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/rcutorture/bin/mkinitrd.sh b/tools/testing/selftests/rcutorture/bin/mkinitrd.sh index 56a56ea06983..da298394daa2 100755 --- a/tools/testing/selftests/rcutorture/bin/mkinitrd.sh +++ b/tools/testing/selftests/rcutorture/bin/mkinitrd.sh @@ -82,8 +82,10 @@ cd $D mkdir -p initrd cd initrd cat > init.c << '___EOF___' +#ifndef NOLIBC #include #include +#endif volatile unsigned long delaycount; @@ -113,7 +115,21 @@ int main(int argc, int argv[]) return 0; } ___EOF___ -${CROSS_COMPILE}gcc -s -static -Os -o init init.c + +# build using nolibc on supported archs (smaller executable) and fall +# back to regular glibc on other ones. +if echo -e "#if __x86_64__||__i386__||__i486__||__i586__||__i686__" \ + "||__ARM_EABI__||__aarch64__\nyes\n#endif" \ + | ${CROSS_COMPILE}gcc -E -nostdlib -xc - \ + | grep -q '^yes'; then + # architecture supported by nolibc + ${CROSS_COMPILE}gcc -fno-asynchronous-unwind-tables -fno-ident \ + -nostdlib -include ../bin/nolibc.h -lgcc -s -static -Os \ + -o init init.c +else + ${CROSS_COMPILE}gcc -s -static -Os -o init init.c +fi + rm init.c echo "Done creating a statically linked C-language initrd" -- 2.17.1