From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
Vasily Gorbik <gor@linux.ibm.com>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [PATCH 4.9 38/49] tracing: Avoid calling cc-option -mrecord-mcount for every Makefile
Date: Mon, 22 Feb 2021 13:36:36 +0100 [thread overview]
Message-ID: <20210222121027.756184104@linuxfoundation.org> (raw)
In-Reply-To: <20210222121022.546148341@linuxfoundation.org>
From: Vasily Gorbik <gor@linux.ibm.com>
commit 07d0408120216b60625c9a5b8012d1c3a907984d upstream.
Currently if CONFIG_FTRACE_MCOUNT_RECORD is enabled -mrecord-mcount
compiler flag support is tested for every Makefile.
Top 4 cc-option usages:
511 -mrecord-mcount
11 -fno-stack-protector
9 -Wno-override-init
2 -fsched-pressure
To address that move cc-option from scripts/Makefile.build to top Makefile
and export CC_USING_RECORD_MCOUNT to be used in original place.
While doing that also add -mrecord-mcount to CC_FLAGS_FTRACE (if gcc
actually supports it).
Link: http://lkml.kernel.org/r/patch-2.thread-aa7b8d.git-de935bace15a.your-ad-here.call-01533557518-ext-9465@work.hours
Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Makefile | 7 +++++++
scripts/Makefile.build | 9 +++------
2 files changed, 10 insertions(+), 6 deletions(-)
--- a/Makefile
+++ b/Makefile
@@ -762,6 +762,13 @@ ifdef CONFIG_FUNCTION_TRACER
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
+ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ # gcc 5 supports generating the mcount tables directly
+ ifeq ($(call cc-option-yn,-mrecord-mcount),y)
+ CC_FLAGS_FTRACE += -mrecord-mcount
+ export CC_USING_RECORD_MCOUNT := 1
+ endif
+endif
export CC_FLAGS_FTRACE
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -222,11 +222,8 @@ cmd_modversions_c = \
endif
ifdef CONFIG_FTRACE_MCOUNT_RECORD
-# gcc 5 supports generating the mcount tables directly
-ifneq ($(call cc-option,-mrecord-mcount,y),y)
-KBUILD_CFLAGS += -mrecord-mcount
-else
-# else do it all manually
+ifndef CC_USING_RECORD_MCOUNT
+# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
RECORDMCOUNT_FLAGS = -w
@@ -255,7 +252,7 @@ cmd_record_mcount = \
"$(CC_FLAGS_FTRACE)" ]; then \
$(sub_cmd_record_mcount) \
fi;
-endif # -record-mcount
+endif # CC_USING_RECORD_MCOUNT
endif
ifdef CONFIG_STACK_VALIDATION
next prev parent reply other threads:[~2021-02-22 13:52 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 12:35 [PATCH 4.9 00/49] 4.9.258-rc1 review Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.9 01/49] mm: memcontrol: fix NULL pointer crash in test_clear_page_writeback() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 02/49] fgraph: Initialize tracing_graph_pause at task creation Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 03/49] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 04/49] af_key: relax availability checks for skb size calculation Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 05/49] iwlwifi: mvm: take mutex for calling iwl_mvm_get_sync_time() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 06/49] iwlwifi: pcie: add a NULL check in iwl_pcie_txq_unmap Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 07/49] iwlwifi: mvm: guard against device removal in reprobe Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 08/49] SUNRPC: Move simple_get_bytes and simple_get_netobj into private header Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 09/49] SUNRPC: Handle 0 length opaque XDR object data properly Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 10/49] lib/string: Add strscpy_pad() function Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 11/49] include/trace/events/writeback.h: fix -Wstringop-truncation warnings Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 12/49] memcg: fix a crash in wb_workfn when a device disappears Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 13/49] futex: Ensure the correct return value from futex_lock_pi() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 14/49] futex: Change locking rules Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 15/49] futex: Cure exit race Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 16/49] squashfs: add more sanity checks in id lookup Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 17/49] squashfs: add more sanity checks in inode lookup Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 18/49] squashfs: add more sanity checks in xattr id lookup Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 19/49] tracing: Do not count ftrace events in top level enable output Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 20/49] tracing: Check length before giving out the filter buffer Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 21/49] ovl: skip getxattr of security labels Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 22/49] ARM: dts: lpc32xx: Revert set default clock rate of HCLK PLL Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 23/49] memblock: do not start bottom-up allocations with kernel_end Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 24/49] bpf: Check for integer overflow when using roundup_pow_of_two() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 25/49] netfilter: xt_recent: Fix attempt to update deleted entry Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 26/49] xen/netback: avoid race in xenvif_rx_ring_slots_available() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 27/49] netfilter: conntrack: skip identical origin tuple in same zone only Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 28/49] h8300: fix PREEMPTION build, TI_PRE_COUNT undefined Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 29/49] usb: dwc3: ulpi: fix checkpatch warning Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 30/49] usb: dwc3: ulpi: Replace CPU-based busyloop with Protocol-based one Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 31/49] net/vmw_vsock: improve locking in vsock_connect_timeout() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 32/49] net: watchdog: hold device global xmit lock during tx disable Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 33/49] vsock/virtio: update credit only if socket is not closed Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 34/49] vsock: fix locking in vsock_shutdown() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 35/49] x86/build: Disable CET instrumentation in the kernel for 32-bit too Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 36/49] trace: Use -mcount-record for dynamic ftrace Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 37/49] tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount Greg Kroah-Hartman
2021-02-22 12:36 ` Greg Kroah-Hartman [this message]
2021-02-22 12:36 ` [PATCH 4.9 39/49] Xen/x86: dont bail early from clear_foreign_p2m_mapping() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 40/49] Xen/x86: also check kernel mapping in set_foreign_p2m_mapping() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 41/49] Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 42/49] Xen/gntdev: correct error checking " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 43/49] xen/arm: dont ignore return errors from set_phys_to_machine Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 44/49] xen-blkback: dont "handle" error by BUG() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 45/49] xen-netback: " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 46/49] xen-scsiback: " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 47/49] xen-blkback: fix error handling in xen_blkbk_map() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 48/49] scsi: qla2xxx: Fix crash during driver load on big endian machines Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.9 49/49] kvm: check tlbs_dirty directly Greg Kroah-Hartman
2021-02-22 18:24 ` [PATCH 4.9 00/49] 4.9.258-rc1 review Florian Fainelli
2021-02-22 21:27 ` Guenter Roeck
2021-02-23 12:04 ` Naresh Kamboju
2021-02-23 21:19 ` Shuah Khan
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