From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
To: Arnd Bergmann <arnd@arndb.de>, <linux-kernel@vger.kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH RESEND 0/2] kbuild: dead code elimination: ftrace fixes
Date: Thu, 22 Dec 2016 09:51:45 +0100 [thread overview]
Message-ID: <1482396707-14349-1-git-send-email-marcin.nowakowski@imgtec.com> (raw)
Enabling dead code & data elimination currently breaks ftrace operation,
as the __mcount_loc section is removed (as it is not referenced directly
anywhere in the code).
Moreover, there are a lot of entries missing in the __mcount_loc section
as the recordmcount tool doesn't currently properly handle the section
names as created by the use of -ffunction-sections.
The following 2 patches fix that behaviour.
They are based on next-20161208.
Marcin Nowakowski (2):
kbuild: keep __mcount_loc table through dead code elimination
recordmcount: fix mcount recording with -ffunction-sections
include/asm-generic/vmlinux.lds.h | 2 +-
scripts/Makefile | 5 +++++
scripts/recordmcount.c | 26 +++++++++++++++++++++++++-
3 files changed, 31 insertions(+), 2 deletions(-)
--
2.7.4
next reply other threads:[~2016-12-22 9:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-22 8:51 Marcin Nowakowski [this message]
2016-12-22 8:51 ` [PATCH 1/2] kbuild: keep __mcount_loc table through dead code elimination Marcin Nowakowski
2016-12-22 8:51 ` [PATCH 2/2] recordmcount: fix mcount recording with -ffunction-sections Marcin Nowakowski
2016-12-22 9:08 ` [PATCH RESEND 0/2] kbuild: dead code elimination: ftrace fixes Nicholas Piggin
2016-12-22 9:15 ` Marcin Nowakowski
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