* [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
@ 2020-08-24 3:48 Gustavo A. R. Silva
2020-08-24 18:46 ` Linus Torvalds
` (3 more replies)
0 siblings, 4 replies; 9+ messages in thread
From: Gustavo A. R. Silva @ 2020-08-24 3:48 UTC (permalink / raw)
To: Linus Torvalds; +Cc: Kees Cook, Linux Kernel Mailing List, Gustavo A. R. Silva
Hi Linus,
Not sure what the problem was with my pull-request for -rc2. So, I'm giving
this a second try because I think it is worth it.
I have build-tested this patch on 10 different architectures: x86_64, i386,
arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha (allyesconfig/
allmodconfig for all of them). This is in linux-next already and kernel
test robot has also helped me to successfully build-test early versions
of this patch[2][3][4][5]. This patch does not introduce any new warnings.
Thank you
--
Gustavo
[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
[2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%25lkp@intel.com/
[3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%25lkp@intel.com/
[4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%25lkp@intel.com/
[5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%25lkp@intel.com/
The following changes since commit d012a7190fc1fd72ed48911e77ca97ba4521bccd:
Linux 5.9-rc2 (2020-08-23 14:08:43 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git tags/fallthrough-pseudo-keyword-5.9-rc3
for you to fetch changes up to df561f6688fef775baa341a0f5d960becd248b11:
treewide: Use fallthrough pseudo-keyword (2020-08-23 17:36:59 -0500)
----------------------------------------------------------------
fallthrough pseudo-keyword macro conversions for 5.9-rc3
Hi Linus,
Please, pull the following tree-wide patch that replaces tons (2484) of
/* fall through */ comments, and its variants, with the new pseudo-keyword
macro fallthrough[1]. Also, remove unnecessary fall-through markings when
it is the case.
There are currently 1167 intances of this fallthrough pseudo-keyword
macro in mainline (5.9-rc2), that have been introduced over the last
couple of development cycles:
$ git grep -nw 'fallthrough;' | wc -l
1167
The global adoption of the fallthrough pseudo-keyword is something certain
to happen; so, better sooner than later. :) This will also save everybody's
time and thousands of lines of unnecessarily repetitive changelog text.
After applying this patch on top of 5.9-rc2, we'll have a total of 3651
instances of this macro:
$ git grep -nw 'fallthrough;' | wc -l
3651
This treewide patch doesn't address ALL fall-through markings in all
subsystems at once because I have previously sent out patches for some of
such subsystems separately, and I will follow up on them; however, this
definitely contributes most of the work needed to replace all the
fall-through markings with the fallthrough pseudo-keyword macro in the
whole codebase.
I have build-tested this patch on 10 different architectures: x86_64, i386,
arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha (allyesconfig
for all of them). This is in linux-next already and kernel test robot has
also helped me to successfully build-test early versions of this
patch[2][3][4][5].
Thanks
--
[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
[2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%25lkp@intel.com/
[3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%25lkp@intel.com/
[4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%25lkp@intel.com/
[5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%25lkp@intel.com/
----------------------------------------------------------------
Gustavo A. R. Silva (1):
treewide: Use fallthrough pseudo-keyword
arch/alpha/kernel/module.c | 2 +-
arch/alpha/kernel/signal.c | 2 +-
arch/alpha/kernel/traps.c | 4 +-
arch/arc/kernel/disasm.c | 2 +-
arch/arc/kernel/signal.c | 2 +-
arch/arc/kernel/unwind.c | 6 +-
arch/arm/kernel/hw_breakpoint.c | 10 +-
arch/arm/kernel/signal.c | 2 +-
arch/arm/mach-ep93xx/crunch.c | 2 +-
arch/arm/mach-mmp/pm-mmp2.c | 8 +-
arch/arm/mach-mmp/pm-pxa910.c | 10 +-
arch/arm/mach-omap2/id.c | 8 --
arch/arm/mach-omap2/omap_device.c | 2 +-
arch/arm/mach-orion5x/dns323-setup.c | 2 +-
arch/arm/mach-rpc/riscpc.c | 2 +-
arch/arm/mach-tegra/reset.c | 2 +-
arch/arm/mm/alignment.c | 4 +-
arch/arm/mm/proc-v7-bugs.c | 2 +-
arch/arm/plat-omap/dma.c | 6 +-
arch/arm/probes/decode.c | 2 +-
arch/arm/probes/kprobes/core.c | 2 +-
arch/arm64/kernel/acpi.c | 2 +-
arch/arm64/kernel/cpufeature.c | 2 +-
arch/arm64/kernel/cpuinfo.c | 2 +-
arch/arm64/kernel/hw_breakpoint.c | 6 +-
arch/arm64/kernel/module.c | 8 +-
arch/arm64/kernel/smp.c | 2 +-
arch/arm64/kvm/handle_exit.c | 2 +-
arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 60 +++++------
arch/arm64/kvm/hyp/vgic-v3-sr.c | 16 +--
arch/arm64/mm/context.c | 2 +-
arch/c6x/kernel/signal.c | 4 +-
arch/csky/kernel/signal.c | 2 +-
arch/h8300/kernel/signal.c | 2 +-
arch/hexagon/kernel/module.c | 2 +-
arch/hexagon/kernel/signal.c | 2 +-
arch/ia64/kernel/crash.c | 2 +-
arch/ia64/kernel/module.c | 2 +-
arch/ia64/kernel/perfmon.c | 2 +-
arch/ia64/kernel/signal.c | 2 +-
arch/ia64/kernel/unaligned.c | 6 +-
arch/ia64/kernel/unwind.c | 2 +-
arch/m68k/atari/atakeyb.c | 2 +-
arch/m68k/kernel/signal.c | 2 +-
arch/m68k/mac/config.c | 2 +-
arch/m68k/mac/via.c | 2 +-
arch/m68k/mm/fault.c | 2 +-
arch/microblaze/kernel/signal.c | 2 +-
arch/mips/include/asm/unroll.h | 64 ++++++------
arch/nds32/kernel/fpu.c | 12 +--
arch/nds32/kernel/signal.c | 4 +-
arch/openrisc/kernel/signal.c | 2 +-
arch/parisc/kernel/signal.c | 2 +-
arch/parisc/kernel/traps.c | 11 +-
arch/parisc/mm/fault.c | 4 +-
arch/powerpc/net/bpf_jit_comp.c | 2 +-
arch/riscv/kernel/signal.c | 2 +-
arch/riscv/net/bpf_jit_comp32.c | 4 +-
arch/sh/drivers/platform_early.c | 2 +-
arch/sh/kernel/disassemble.c | 4 +-
arch/sh/kernel/kgdb.c | 2 +-
arch/sh/kernel/signal_32.c | 2 +-
arch/sparc/kernel/auxio_64.c | 1 -
arch/sparc/kernel/central.c | 2 +-
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arch/sparc/kernel/kgdb_64.c | 2 +-
arch/sparc/kernel/pcr.c | 2 +-
arch/sparc/kernel/prom_32.c | 2 +-
arch/sparc/kernel/signal32.c | 4 +-
arch/sparc/kernel/signal_32.c | 4 +-
arch/sparc/kernel/signal_64.c | 4 +-
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arch/sparc/net/bpf_jit_comp_32.c | 2 +-
arch/um/kernel/signal.c | 2 +-
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arch/x86/boot/compressed/kaslr.c | 2 +-
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arch/x86/kernel/cpu/cacheinfo.c | 2 +-
arch/x86/kernel/cpu/mce/inject.c | 2 +-
arch/x86/kernel/cpu/mce/intel.c | 2 +-
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arch/x86/kernel/uprobes.c | 4 +-
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arch/x86/kvm/hyperv.c | 2 +-
arch/x86/kvm/irq_comm.c | 2 +-
arch/x86/kvm/lapic.c | 6 +-
arch/x86/kvm/mmu/mmu.c | 2 +-
arch/x86/kvm/svm/svm.c | 2 +-
arch/x86/kvm/vmx/vmx.c | 12 +--
arch/x86/kvm/x86.c | 11 +-
arch/x86/lib/cmdline.c | 8 +-
arch/x86/lib/insn-eval.c | 6 +-
arch/x86/math-emu/errors.c | 2 +-
arch/x86/math-emu/fpu_trig.c | 2 +-
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crypto/tcrypt.c | 114 ++++++++++-----------
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drivers/ata/libahci_platform.c | 2 +-
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drivers/crypto/chelsio/chcr_ktls.c | 4 +-
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drivers/crypto/ux500/cryp/cryp.c | 12 +--
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drivers/edac/amd64_edac.c | 2 +-
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drivers/gpu/drm/i915/display/intel_sdvo.c | 12 +--
drivers/gpu/drm/i915/display/intel_sprite.c | 22 ++--
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drivers/gpu/drm/i915/gem/i915_gem_mman.c | 2 +-
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drivers/gpu/drm/i915/gvt/handlers.c | 2 +-
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
drivers/gpu/drm/i915/i915_pmu.c | 2 +-
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drivers/watchdog/sc1200wdt.c | 2 +-
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include/linux/signal.h | 12 +--
include/linux/skbuff.h | 12 +--
include/math-emu/op-common.h | 10 +-
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net/9p/trans_xen.c | 2 +-
net/atm/common.c | 4 +-
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net/atm/resources.c | 8 +-
net/bpf/test_run.c | 2 +-
net/can/j1939/socket.c | 2 +-
net/can/j1939/transport.c | 20 ++--
net/ceph/ceph_hash.c | 20 ++--
net/ceph/crush/mapper.c | 2 +-
net/ceph/messenger.c | 4 +-
net/ceph/mon_client.c | 2 +-
net/ceph/osd_client.c | 4 +-
net/core/dev.c | 4 +-
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net/core/devlink.c | 4 +-
net/core/drop_monitor.c | 2 +-
net/core/filter.c | 2 +-
net/core/pktgen.c | 2 +-
net/core/skmsg.c | 1 -
net/core/sock.c | 2 +-
net/dccp/ccids/ccid3.c | 2 +-
net/dccp/feat.c | 3 +-
net/dccp/input.c | 10 +-
net/dccp/options.c | 2 +-
net/dccp/output.c | 8 +-
net/dccp/proto.c | 8 +-
net/decnet/af_decnet.c | 6 +-
net/decnet/dn_nsp_in.c | 2 +-
net/decnet/dn_table.c | 2 +-
net/decnet/sysctl_net_decnet.c | 2 +-
net/dsa/slave.c | 2 +-
net/ieee802154/6lowpan/reassembly.c | 2 +-
net/ieee802154/6lowpan/rx.c | 4 +-
net/iucv/af_iucv.c | 10 +-
net/mpls/af_mpls.c | 2 +-
net/mptcp/protocol.c | 3 +-
net/ncsi/ncsi-manage.c | 4 +-
net/netfilter/ipvs/ip_vs_proto_tcp.c | 2 +-
net/netfilter/ipvs/ip_vs_proto_udp.c | 2 +-
net/netlink/policy.c | 2 +-
net/netrom/nr_in.c | 2 +-
net/netrom/nr_route.c | 8 +-
net/openvswitch/conntrack.c | 4 +-
net/openvswitch/flow.c | 2 +-
net/packet/af_packet.c | 2 +-
net/phonet/pep.c | 10 +-
net/rds/send.c | 2 +-
net/rose/rose_in.c | 2 +-
net/rose/rose_route.c | 4 +-
net/rxrpc/af_rxrpc.c | 6 +-
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net/rxrpc/conn_client.c | 2 +-
net/rxrpc/input.c | 6 +-
net/rxrpc/local_object.c | 2 +-
net/rxrpc/peer_event.c | 2 +-
net/rxrpc/recvmsg.c | 2 +-
net/rxrpc/sendmsg.c | 6 +-
net/sched/sch_cake.c | 2 +-
net/sctp/ipv6.c | 2 +-
net/sctp/outqueue.c | 6 +-
net/sctp/sm_make_chunk.c | 2 +-
net/sctp/sm_sideeffect.c | 2 +-
net/sctp/sm_statefuns.c | 2 +-
net/smc/smc_close.c | 2 +-
net/sunrpc/auth_gss/gss_krb5_wrap.c | 2 +-
net/sunrpc/clnt.c | 22 ++--
net/sunrpc/xprt.c | 2 +-
net/sunrpc/xprtrdma/verbs.c | 2 +-
net/sunrpc/xprtsock.c | 8 +-
net/tipc/bearer.c | 2 +-
net/tipc/group.c | 2 +-
net/tipc/link.c | 2 +-
net/tipc/socket.c | 4 +-
net/unix/af_unix.c | 2 +-
net/wireless/chan.c | 4 +-
net/wireless/mlme.c | 2 +-
net/wireless/nl80211.c | 20 ++--
net/wireless/scan.c | 2 +-
net/wireless/sme.c | 4 +-
net/wireless/util.c | 4 +-
net/wireless/wext-compat.c | 4 +-
net/x25/x25_facilities.c | 2 +-
net/x25/x25_in.c | 2 +-
net/xfrm/xfrm_policy.c | 2 +-
samples/bpf/hbm.c | 2 +-
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security/tomoyo/common.c | 18 ++--
security/tomoyo/file.c | 2 +-
sound/ppc/snd_ps3.c | 4 +-
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sound/soc/codecs/jz4770.c | 2 +-
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sound/soc/intel/boards/bytcht_es8316.c | 2 +-
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sound/soc/rockchip/rockchip_pdm.c | 6 +-
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sound/soc/sof/pcm.c | 4 +-
sound/soc/ti/davinci-i2s.c | 2 +-
sound/soc/ti/n810.c | 2 +-
sound/soc/ti/omap-dmic.c | 4 +-
sound/soc/ti/omap-mcpdm.c | 8 +-
sound/soc/ti/rx51.c | 2 +-
sound/soc/zte/zx-i2s.c | 4 +-
sound/soc/zte/zx-spdif.c | 2 +-
1148 files changed, 2667 insertions(+), 2737 deletions(-)
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 3:48 [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3 Gustavo A. R. Silva
@ 2020-08-24 18:46 ` Linus Torvalds
2020-08-24 18:56 ` Joe Perches
2020-08-24 20:58 ` Gustavo A. R. Silva
2020-08-24 19:21 ` pr-tracker-bot
` (2 subsequent siblings)
3 siblings, 2 replies; 9+ messages in thread
From: Linus Torvalds @ 2020-08-24 18:46 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: Kees Cook, Linux Kernel Mailing List
On Sun, Aug 23, 2020 at 8:42 PM Gustavo A. R. Silva
<gustavoars@kernel.org> wrote:
>
> Not sure what the problem was with my pull-request for -rc2. So, I'm giving
> this a second try because I think it is worth it.
Just "a ton of lines changed across subsystems, I feel like I need to check it".
For example, you say that you remove unnecessary fall-through
markings, but I'm not sure what your pattern for that was.
You left the one in arch/arm64/kernel/cpuinfo.c:
cpuinfo_detect_icache_policy(), for example.
And you've fixed up indentation clearly by hand in places, but then
it's incorrectly done in other places (dib8096_set_param_override())
I've pulled it, but these kinds of "trivial" conversions do make me
nervous. We've had a lot of cases of them breaking things, and it's a
pain to find when it happens.
I think I'd have preferred to get this as a couple of scripts that do
the obvious 1:1 direct conversion of the simple cases that cover 90%
of it all, so then the manual fixups separately.
Oh well. I've pulled it.
Linus
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 18:46 ` Linus Torvalds
@ 2020-08-24 18:56 ` Joe Perches
2020-08-24 20:58 ` Gustavo A. R. Silva
1 sibling, 0 replies; 9+ messages in thread
From: Joe Perches @ 2020-08-24 18:56 UTC (permalink / raw)
To: Linus Torvalds, Gustavo A. R. Silva
Cc: Kees Cook, Linux Kernel Mailing List, Nick Desaulniers
On Mon, 2020-08-24 at 11:46 -0700, Linus Torvalds wrote:
> I think I'd have preferred to get this as a couple of scripts that do
> the obvious 1:1 direct conversion of the simple cases that cover 90%
> of it all, so then the manual fixups separately.
I created a script and sent it directly to you last year.
https://lore.kernel.org/lkml/9fe980f7e28242c2835ffae34914c5f68e8268a7.camel@perches.com/
I believe that Gustavo uses a different script and some
manual fixups.
It would be good if Gustavo's script was public somewhere.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 18:46 ` Linus Torvalds
2020-08-24 18:56 ` Joe Perches
@ 2020-08-24 20:58 ` Gustavo A. R. Silva
1 sibling, 0 replies; 9+ messages in thread
From: Gustavo A. R. Silva @ 2020-08-24 20:58 UTC (permalink / raw)
To: Linus Torvalds, Gustavo A. R. Silva; +Cc: Kees Cook, Linux Kernel Mailing List
On 8/24/20 13:46, Linus Torvalds wrote:
> On Sun, Aug 23, 2020 at 8:42 PM Gustavo A. R. Silva
> <gustavoars@kernel.org> wrote:
>>
>> Not sure what the problem was with my pull-request for -rc2. So, I'm giving
>> this a second try because I think it is worth it.
>
> Just "a ton of lines changed across subsystems, I feel like I need to check it".
>
Yep; you're right. These are tons of changes...
> For example, you say that you remove unnecessary fall-through
> markings, but I'm not sure what your pattern for that was.
>
fall-through markings are not necessary for consecutive case labels.
I will soon send a patch to add this info to "Implicit switch case fall-through"
in deprecated.rst
> You left the one in arch/arm64/kernel/cpuinfo.c:
> cpuinfo_detect_icache_policy(), for example.
>> And you've fixed up indentation clearly by hand in places, but then
> it's incorrectly done in other places (dib8096_set_param_override())
>
Yeah; I overlooked those two. I'll address them in a future pull-request.
> I've pulled it, but these kinds of "trivial" conversions do make me
> nervous. We've had a lot of cases of them breaking things, and it's a
> pain to find when it happens.
>
I know; don't worry, I'll be here to fix anything that has to do with
this change ASAP, like in this case:
https://lore.kernel.org/lkml/20200824203614.GA28543@embeddedor/
could you take it?
> I think I'd have preferred to get this as a couple of scripts that do
> the obvious 1:1 direct conversion of the simple cases that cover 90%
> of it all, so then the manual fixups separately.
>
I've got it. I will certainly take this into account for future PRs.
> Oh well. I've pulled it.
>
Awesome. :)
Thank you!
--
Gustavo
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 3:48 [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3 Gustavo A. R. Silva
2020-08-24 18:46 ` Linus Torvalds
@ 2020-08-24 19:21 ` pr-tracker-bot
2020-08-24 19:43 ` Nathan Chancellor
2020-08-25 23:36 ` Peter Rosin
3 siblings, 0 replies; 9+ messages in thread
From: pr-tracker-bot @ 2020-08-24 19:21 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Linus Torvalds, Kees Cook, Linux Kernel Mailing List,
Gustavo A. R. Silva
The pull request you sent on Sun, 23 Aug 2020 22:48:41 -0500:
> git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git tags/fallthrough-pseudo-keyword-5.9-rc3
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/2bf74771ca5610b10c3ac4cd17aacc389e6927ca
Thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/prtracker.html
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 3:48 [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3 Gustavo A. R. Silva
2020-08-24 18:46 ` Linus Torvalds
2020-08-24 19:21 ` pr-tracker-bot
@ 2020-08-24 19:43 ` Nathan Chancellor
2020-08-24 20:04 ` Gustavo A. R. Silva
2020-08-25 23:36 ` Peter Rosin
3 siblings, 1 reply; 9+ messages in thread
From: Nathan Chancellor @ 2020-08-24 19:43 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Linus Torvalds, Kees Cook, Linux Kernel Mailing List,
Michael Ellerman, linuxppc-dev
On Sun, Aug 23, 2020 at 10:48:41PM -0500, Gustavo A. R. Silva wrote:
> Hi Linus,
>
> Not sure what the problem was with my pull-request for -rc2. So, I'm giving
> this a second try because I think it is worth it.
>
> I have build-tested this patch on 10 different architectures: x86_64, i386,
> arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha (allyesconfig/
> allmodconfig for all of them). This is in linux-next already and kernel
> test robot has also helped me to successfully build-test early versions
> of this patch[2][3][4][5]. This patch does not introduce any new warnings.
>
> Thank you
> --
> Gustavo
>
> [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
> [2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%25lkp@intel.com/
> [3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%25lkp@intel.com/
> [4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%25lkp@intel.com/
> [5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%25lkp@intel.com/
>
>
> The following changes since commit d012a7190fc1fd72ed48911e77ca97ba4521bccd:
>
> Linux 5.9-rc2 (2020-08-23 14:08:43 -0700)
>
> are available in the Git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git tags/fallthrough-pseudo-keyword-5.9-rc3
>
> for you to fetch changes up to df561f6688fef775baa341a0f5d960becd248b11:
>
> treewide: Use fallthrough pseudo-keyword (2020-08-23 17:36:59 -0500)
>
> ----------------------------------------------------------------
> fallthrough pseudo-keyword macro conversions for 5.9-rc3
>
> Hi Linus,
>
> Please, pull the following tree-wide patch that replaces tons (2484) of
> /* fall through */ comments, and its variants, with the new pseudo-keyword
> macro fallthrough[1]. Also, remove unnecessary fall-through markings when
> it is the case.
>
> There are currently 1167 intances of this fallthrough pseudo-keyword
> macro in mainline (5.9-rc2), that have been introduced over the last
> couple of development cycles:
>
> $ git grep -nw 'fallthrough;' | wc -l
> 1167
>
> The global adoption of the fallthrough pseudo-keyword is something certain
> to happen; so, better sooner than later. :) This will also save everybody's
> time and thousands of lines of unnecessarily repetitive changelog text.
>
> After applying this patch on top of 5.9-rc2, we'll have a total of 3651
> instances of this macro:
>
> $ git grep -nw 'fallthrough;' | wc -l
> 3651
>
> This treewide patch doesn't address ALL fall-through markings in all
> subsystems at once because I have previously sent out patches for some of
> such subsystems separately, and I will follow up on them; however, this
> definitely contributes most of the work needed to replace all the
> fall-through markings with the fallthrough pseudo-keyword macro in the
> whole codebase.
>
> I have build-tested this patch on 10 different architectures: x86_64, i386,
> arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha (allyesconfig
> for all of them). This is in linux-next already and kernel test robot has
> also helped me to successfully build-test early versions of this
> patch[2][3][4][5].
>
> Thanks
> --
> [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
> [2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%25lkp@intel.com/
> [3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%25lkp@intel.com/
> [4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%25lkp@intel.com/
> [5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%25lkp@intel.com/
>
> ----------------------------------------------------------------
> Gustavo A. R. Silva (1):
> treewide: Use fallthrough pseudo-keyword
$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ
$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
...
In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
from arch/powerpc/boot/decompress.c:38:
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
586 | fallthrough;
| ^~~~~~~~~~~
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: note: each undeclared identifier is reported only once for each function it appears in
In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:235,
from arch/powerpc/boot/decompress.c:38:
arch/powerpc/boot/../../../lib/xz/xz_dec_lzma2.c: In function 'xz_dec_lzma2_run':
arch/powerpc/boot/../../../lib/xz/xz_dec_lzma2.c:1046:4: error: 'fallthrough' undeclared (first use in this function)
1046 | fallthrough;
| ^~~~~~~~~~~
make[2]: *** [arch/powerpc/boot/Makefile:215: arch/powerpc/boot/decompress.o] Error 1
make[2]: Target 'arch/powerpc/boot/zImage' not remade because of errors.
make[1]: *** [arch/powerpc/Makefile:295: zImage] Error 2
make: *** [Makefile:335: __build_one_by_one] Error 2
make: Target 'distclean' not remade because of errors.
make: Target 'powernv_defconfig' not remade because of errors.
make: Target 'zImage' not remade because of errors.
This will end up affecting distribution configurations such as Debian
and OpenSUSE according to my testing. I am not sure what the solution
is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure that
compiler_attributes.h can be safely included. Adding Michael and
linuxppc-dev to CC.
Cheers,
Nathan
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 19:43 ` Nathan Chancellor
@ 2020-08-24 20:04 ` Gustavo A. R. Silva
0 siblings, 0 replies; 9+ messages in thread
From: Gustavo A. R. Silva @ 2020-08-24 20:04 UTC (permalink / raw)
To: Nathan Chancellor, Gustavo A. R. Silva
Cc: Linus Torvalds, Kees Cook, Linux Kernel Mailing List,
Michael Ellerman, linuxppc-dev
Hi Nathan,
On 8/24/20 14:43, Nathan Chancellor wrote:
>> Gustavo A. R. Silva (1):
>> treewide: Use fallthrough pseudo-keyword
>
> $ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ
>
> $ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
> ...
> In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
> from arch/powerpc/boot/decompress.c:38:
> arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
> arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
> 586 | fallthrough;
> | ^~~~~~~~~~~
> arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: note: each undeclared identifier is reported only once for each function it appears in
> In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:235,
> from arch/powerpc/boot/decompress.c:38:
> arch/powerpc/boot/../../../lib/xz/xz_dec_lzma2.c: In function 'xz_dec_lzma2_run':
> arch/powerpc/boot/../../../lib/xz/xz_dec_lzma2.c:1046:4: error: 'fallthrough' undeclared (first use in this function)
> 1046 | fallthrough;
> | ^~~~~~~~~~~
> make[2]: *** [arch/powerpc/boot/Makefile:215: arch/powerpc/boot/decompress.o] Error 1
> make[2]: Target 'arch/powerpc/boot/zImage' not remade because of errors.
> make[1]: *** [arch/powerpc/Makefile:295: zImage] Error 2
> make: *** [Makefile:335: __build_one_by_one] Error 2
> make: Target 'distclean' not remade because of errors.
> make: Target 'powernv_defconfig' not remade because of errors.
> make: Target 'zImage' not remade because of errors.
>
> This will end up affecting distribution configurations such as Debian
> and OpenSUSE according to my testing. I am not sure what the solution
> is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure that
> compiler_attributes.h can be safely included. Adding Michael and
> linuxppc-dev to CC.
>
Thanks for the report. I think, for now, the best solution is to
use /* fall through */ comments instead of the pseudo-keyword in
lib/
I'll send a fix for that right away.
Thanks
--
Gustavo
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3
2020-08-24 3:48 [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3 Gustavo A. R. Silva
` (2 preceding siblings ...)
2020-08-24 19:43 ` Nathan Chancellor
@ 2020-08-25 23:36 ` Peter Rosin
2020-08-26 0:16 ` Gustavo A. R. Silva
3 siblings, 1 reply; 9+ messages in thread
From: Peter Rosin @ 2020-08-25 23:36 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: Kees Cook, Linux Kernel Mailing List, Linus Torvalds
On 2020-08-23 22:48, Gustavo A. R. Silva wrote:
> Hi Linus,
>
> Please, pull the following tree-wide patch that replaces tons (2484) of
> /* fall through */ comments, and its variants, with the new pseudo-keyword
> macro fallthrough[1]. Also, remove unnecessary fall-through markings when
> it is the case.
Hi.
This is the second time [1] you have messed up the reading pleasure of
drivers/iio/dac/dpot-dac.c with mindless fall through conversions.
The comments in that file no longer make sense.
With more context:
case IIO_VAL_INT:
/*
* Convert integer scale to fractional scale by
* setting the denominator (val2) to one, and...
*/
*val2 = 1;
ret = IIO_VAL_FRACTIONAL;
- /* fall through */
+ fallthrough;
case IIO_VAL_FRACTIONAL:
*val *= regulator_get_voltage(dac->vref) / 1000;
*val2 *= dac->max_ohms;
break;
}
See how the comment ending with "and..." is no longer continued? I
disliked the last change to this file [2] that (after pressure) moved
"and" from the original "...and fall through." comment away from where
it belonged (instead of just removing it) exactly because it was less
clear that the "fall through" was part of the natural comment reading.
But this latest patch just destroys the commentary completely.
I guess I should have stood my ground the last time with my
/* ...and fall through. Say it again for GCC. */
/* fall through */
suggestion, so that it would now have become
/* ...and fall through. Say it again for GCC. */
fallthrough;
with this latest change. Because that makes sense.
If it was someone else, it would be understandable, but since it was
you - again - I expect a patch fixing this. Either as I suggested above
or some other way.
Comments are important.
Cheers,
Peter
[1] https://lore.kernel.org/lkml/20181008173528.GA31787@embeddedor.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/iio/dac/dpot-dac.c?id=c65a0d84ee9c
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2020-08-26 0:10 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
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2020-08-24 3:48 [GIT PULL] fallthrough pseudo-keyword macro conversions for 5.9-rc3 Gustavo A. R. Silva
2020-08-24 18:46 ` Linus Torvalds
2020-08-24 18:56 ` Joe Perches
2020-08-24 20:58 ` Gustavo A. R. Silva
2020-08-24 19:21 ` pr-tracker-bot
2020-08-24 19:43 ` Nathan Chancellor
2020-08-24 20:04 ` Gustavo A. R. Silva
2020-08-25 23:36 ` Peter Rosin
2020-08-26 0:16 ` Gustavo A. R. Silva
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