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    • Sebastian Andrzej Siewior's avatar
      kbuild: add -fno-PIE · 39f99860
      Sebastian Andrzej Siewior authored
      [ Upstream commit 8ae94224 ]
      
      Debian started to build the gcc with -fPIE by default so the kernel
      build ends before it starts properly with:
      |kernel/bounds.c:1:0: error: code model kernel does not support PIC mode
      
      Also add to KBUILD_AFLAGS due to:
      
      |gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S
      |arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic
      
      Tagging it stable so it is possible to compile recent stable kernels as
      well.
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
      Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
      39f99860
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  22. 06 Jun, 2016 3 commits
    • Sasha Levin's avatar
      Linux 4.1.26 · 88817286
      Sasha Levin authored
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      88817286
    • Arnd Bergmann's avatar
      kbuild: move -Wunused-const-variable to W=1 warning level · 4cfbd219
      Arnd Bergmann authored
      [ Upstream commit c9c6837d ]
      
      gcc-6 started warning by default about variables that are not
      used anywhere and that are marked 'const', generating many
      false positives in an allmodconfig build, e.g.:
      
      arch/arm/mach-davinci/board-da830-evm.c:282:20: warning: 'da830_evm_emif25_pins' defined but not used [-Wunused-const-variable=]
      arch/arm/plat-omap/dmtimer.c:958:34: warning: 'omap_timer_match' defined but not used [-Wunused-const-variable=]
      drivers/bluetooth/hci_bcm.c:625:39: warning: 'acpi_bcm_default_gpios' defined but not used [-Wunused-const-variable=]
      drivers/char/hw_random/omap-rng.c:92:18: warning: 'reg_map_omap4' defined but not used [-Wunused-const-variable=]
      drivers/devfreq/exynos/exynos5_bus.c:381:32: warning: 'exynos5_busfreq_int_pm' defined but not used [-Wunused-const-variable=]
      drivers/dma/mv_xor.c:1139:34: warning: 'mv_xor_dt_ids' defined but not used [-Wunused-const-variable=]
      
      This is similar to the existing -Wunused-but-set-variable warning
      that was added in an earlier release and that we disable by default
      now and only enable when W=1 is set, so it makes sense to do
      the same here. Once we have eliminated the majority of the
      warnings for both, we can put them back into the default list.
      
      We probably want this in backport kernels as well, to allow building
      them with gcc-6 without introducing extra warnings.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarOlof Johansson <olof@lixom.net>
      Acked-by: default avatarLee Jones <lee.jones@linaro.org>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      4cfbd219
    • Arnd Bergmann's avatar
      gcov: disable tree-loop-im to reduce stack usage · ff0ee291
      Arnd Bergmann authored
      [ Upstream commit c87bf431 ]
      
      Enabling CONFIG_GCOV_PROFILE_ALL produces us a lot of warnings like
      
      lib/lz4/lz4hc_compress.c: In function 'lz4_compresshcctx':
      lib/lz4/lz4hc_compress.c:514:1: warning: the frame size of 1504 bytes is larger than 1024 bytes [-Wframe-larger-than=]
      
      After some investigation, I found that this behavior started with gcc-4.9,
      and opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69702.
      A suggested workaround for it is to use the -fno-tree-loop-im
      flag that turns off one of the optimization stages in gcc, so the
      code runs a little slower but does not use excessive amounts
      of stack.
      
      We could make this conditional on the gcc version, but I could not
      find an easy way to do this in Kbuild and the benefit would be
      fairly small, given that most of the gcc version in production are
      affected now.
      
      I'm marking this for 'stable' backports because it addresses a bug
      with code generation in gcc that exists in all kernel versions
      with the affected gcc releases.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      ff0ee291
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