diff mbox series

[4.9,36/49] trace: Use -mcount-record for dynamic ftrace

Message ID	20210222121027.597696546@linuxfoundation.org
State	New
Headers	show Return-Path: <stable-owner@kernel.org> 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>, "Steven Rostedt (VMware)" <rostedt@goodmis.org> Subject: [PATCH 4.9 36/49] trace: Use -mcount-record for dynamic ftrace Date: Mon, 22 Feb 2021 13:36:34 +0100 Message-Id: <20210222121027.597696546@linuxfoundation.org> In-Reply-To: <20210222121022.546148341@linuxfoundation.org> References: <20210222121022.546148341@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	None \| expand [4.9,02/49] fgraph: Initialize tracing_graph_pause at task creation [4.9,03/49] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load [4.9,04/49] af_key: relax availability checks for skb size calculation [4.9,05/49] iwlwifi: mvm: take mutex for calling iwl_mvm_get_sync_time() [4.9,06/49] iwlwifi: pcie: add a NULL check in iwl_pcie_txq_unmap [4.9,07/49] iwlwifi: mvm: guard against device removal in reprobe [4.9,08/49] SUNRPC: Move simple_get_bytes and simple_get_netobj into private header [4.9,09/49] SUNRPC: Handle 0 length opaque XDR object data properly [4.9,10/49] lib/string: Add strscpy_pad() function [4.9,11/49] include/trace/events/writeback.h: fix -Wstringop-truncation warnings [4.9,12/49] memcg: fix a crash in wb_workfn when a device disappears [4.9,13/49] futex: Ensure the correct return value from futex_lock_pi() [4.9,14/49] futex: Change locking rules [4.9,15/49] futex: Cure exit race [4.9,16/49] squashfs: add more sanity checks in id lookup [4.9,17/49] squashfs: add more sanity checks in inode lookup [4.9,18/49] squashfs: add more sanity checks in xattr id lookup [4.9,19/49] tracing: Do not count ftrace events in top level enable output [4.9,20/49] tracing: Check length before giving out the filter buffer [4.9,21/49] ovl: skip getxattr of security labels [4.9,22/49] ARM: dts: lpc32xx: Revert set default clock rate of HCLK PLL [4.9,23/49] memblock: do not start bottom-up allocations with kernel_end [4.9,24/49] bpf: Check for integer overflow when using roundup_pow_of_two() [4.9,25/49] netfilter: xt_recent: Fix attempt to update deleted entry [4.9,26/49] xen/netback: avoid race in xenvif_rx_ring_slots_available() [4.9,27/49] netfilter: conntrack: skip identical origin tuple in same zone only [4.9,28/49] h8300: fix PREEMPTION build, TI_PRE_COUNT undefined [4.9,29/49] usb: dwc3: ulpi: fix checkpatch warning [4.9,30/49] usb: dwc3: ulpi: Replace CPU-based busyloop with Protocol-based one [4.9,31/49] net/vmw_vsock: improve locking in vsock_connect_timeout() [4.9,32/49] net: watchdog: hold device global xmit lock during tx disable [4.9,33/49] vsock/virtio: update credit only if socket is not closed [4.9,34/49] vsock: fix locking in vsock_shutdown() [4.9,35/49] x86/build: Disable CET instrumentation in the kernel for 32-bit too [4.9,36/49] trace: Use -mcount-record for dynamic ftrace [4.9,37/49] tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount [4.9,38/49] tracing: Avoid calling cc-option -mrecord-mcount for every Makefile [4.9,39/49] Xen/x86: dont bail early from clear_foreign_p2m_mapping() [4.9,40/49] Xen/x86: also check kernel mapping in set_foreign_p2m_mapping() [4.9,41/49] Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages() [4.9,42/49] Xen/gntdev: correct error checking in gntdev_map_grant_pages() [4.9,43/49] xen/arm: dont ignore return errors from set_phys_to_machine [4.9,44/49] xen-blkback: dont "handle" error by BUG() [4.9,45/49] xen-netback: dont "handle" error by BUG() [4.9,46/49] xen-scsiback: dont "handle" error by BUG() [4.9,47/49] xen-blkback: fix error handling in xen_blkbk_map() [4.9,48/49] scsi: qla2xxx: Fix crash during driver load on big endian machines [4.9,49/49] kvm: check tlbs_dirty directly

Commit Message

Greg KH Feb. 22, 2021, 12:36 p.m. UTC

From: Andi Kleen <ak@linux.intel.com>

commit 96f60dfa5819a065bfdd2f2ba0df7d9cbce7f4dd upstream.

gcc 5 supports a new -mcount-record option to generate ftrace
tables directly. This avoids the need to run record_mcount
manually.

Use this option when available.

So far doesn't use -mcount-nop, which also exists now.

This is needed to make ftrace work with LTO because the
normal record-mcount script doesn't run over the link
time output.

It should also improve build times slightly in the general
case.
Link: http://lkml.kernel.org/r/20171127213423.27218-12-andi@firstfloor.org

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 scripts/Makefile.build |    6 ++++++
 1 file changed, 6 insertions(+)

diff mbox series

Patch

--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -222,6 +222,11 @@  cmd_modversions_c =								\
 endif
 
 ifdef CONFIG_FTRACE_MCOUNT_RECORD
+# gcc 5 supports generating the mcount tables directly
+ifneq ($(call cc-option,-mrecord-mcount,y),y)
+KBUILD_CFLAGS += -mrecord-mcount
+else
+# else do it all manually
 ifdef BUILD_C_RECORDMCOUNT
 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
   RECORDMCOUNT_FLAGS = -w
@@ -264,6 +269,7 @@  endif
 ifdef CONFIG_GCOV_KERNEL
 objtool_args += --no-unreachable
 endif
+endif
 
 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file