From: Peter Zijlstra <peterz@infradead.org>
To: "Uwe Kleine-König" <ukleinek@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
linux-tip-commits@vger.kernel.org, linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
x86@kernel.org
Subject: Re: [tip: objtool/urgent] objtool, pwm: mediatek: Prevent theoretical divide-by-zero in pwm_mediatek_config()
Date: Wed, 26 Mar 2025 12:11:29 +0100 [thread overview]
Message-ID: <20250326111129.GC5880@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <4avdt2nru6cpypssyw5chxiuadh74qcobfboopwsske2ycr565@qnb6utlyxuj4>
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On Wed, Mar 26, 2025 at 11:35:28AM +0100, Uwe Kleine-König wrote:
> and the build works fine for me and there is no warning about
> drivers/pwm/pwm-mediatek.o. What am I missing?
Could be compiler related; IIRC it is mostly clang that does this. When
it finds /0 it simply stops code-gen.
I *really* dislike this behaviour, but since C declares this UB, they're
basically free to do whatever.
IMO it should just emit the code; kernel has exceptions to deal with
this and userspace gets signals.
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next prev parent reply other threads:[~2025-03-26 11:11 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-24 21:55 [PATCH 00/22] objtool: CONFIG_OBJTOOL_WERROR fixes and cleanups Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 01/22] objtool: Fix detection of consecutive jump tables Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] objtool: Fix detection of consecutive jump tables on Clang 20 tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 02/22] objtool: Warn when disabling unreachable warnings Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 03/22] objtool: Ignore entire functions rather than instructions Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 04/22] objtool: Fix X86_FEATURE_SMAP alternative handling Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 05/22] objtool: Fix CONFIG_OBJTOOL_WERROR for vmlinux.o Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 06/22] objtool: Fix init_module() handling Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 07/22] objtool: Silence more KCOV warnings Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 08/22] objtool: Properly disable uaccess validation Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:55 ` [PATCH 09/22] objtool: Improve error handling Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 10/22] objtool: Reduce CONFIG_OBJTOOL_WERROR verbosity Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 11/22] objtool: Fix up some outdated references to ENTRY/ENDPROC Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 12/22] objtool: Remove --no-unreachable for noinstr-only vmlinux.o runs Josh Poimboeuf
2025-03-25 8:35 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 13/22] objtool: Remove redundant opts.noinstr dependency Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 14/22] spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, " tip-bot2 for Josh Poimboeuf
2025-03-25 13:13 ` Mark Brown
2025-03-25 22:10 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 15/22] nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, " tip-bot2 for Josh Poimboeuf
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-25 22:20 ` Chaitanya Kulkarni
2025-03-24 21:56 ` [PATCH 16/22] media: dib8000: Prevent divide-by-zero in dib8000_set_dds() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, " tip-bot2 for Josh Poimboeuf
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-25 22:42 ` Mauro Carvalho Chehab
2025-03-26 1:46 ` Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 17/22] panic: Disable SMAP in __stack_chk_fail() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, " tip-bot2 for Josh Poimboeuf
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 18/22] Input: cyapa - remove undefined behavior in cyapa_update_fw_store() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, Input: cyapa - Remove " tip-bot2 for Josh Poimboeuf
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 19/22] ASoC: codecs: wcd934x: Remove undefined behavior in wcd934x_slim_irq_handler() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, ASoC: codecs: wcd934x: Remove potential " tip-bot2 for Josh Poimboeuf
2025-03-25 11:32 ` Mark Brown
2025-03-25 11:36 ` Ingo Molnar
2025-03-25 13:12 ` Mark Brown
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 20/22] regulator: rk808: Remove undefined behavior in rk806_set_mode_dcdc() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, regulator: rk808: Remove potential " tip-bot2 for Josh Poimboeuf
2025-03-25 13:17 ` Mark Brown
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 21/22] pwm: mediatek: Prevent divide-by-zero in pwm_mediatek_config() Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, pwm: mediatek: Prevent theoretical " tip-bot2 for Josh Poimboeuf
2025-03-26 10:35 ` Uwe Kleine-König
2025-03-26 11:11 ` Peter Zijlstra [this message]
2025-03-27 5:44 ` Josh Poimboeuf
2025-03-27 8:27 ` Uwe Kleine-König
[not found] ` <m7pgkp3ueo7iqgqf74upjrihr3mpmb3sqhwegnjxxwsrgx2jsw@dnec5iqiyobh>
[not found] ` <Z-Uv60sD_S2xYVB1@gmail.com>
2025-03-27 18:14 ` Uwe Kleine-König
2025-03-27 21:21 ` Ingo Molnar
2025-03-28 10:24 ` Uwe Kleine-König
2025-03-28 13:45 ` Ingo Molnar
2025-03-28 18:19 ` Uwe Kleine-König
2025-03-25 22:09 ` tip-bot2 for Josh Poimboeuf
2025-03-27 11:06 ` tip-bot2 for Josh Poimboeuf
2025-03-24 21:56 ` [PATCH 22/22] lkdtm: Obfuscate do_nothing() pointer Josh Poimboeuf
2025-03-25 8:34 ` [tip: objtool/urgent] objtool, lkdtm: Obfuscate the " tip-bot2 for Josh Poimboeuf
2025-03-25 19:39 ` [PATCH 22/22] lkdtm: Obfuscate " Kees Cook
2025-03-25 22:09 ` [tip: objtool/urgent] objtool, lkdtm: Obfuscate the " tip-bot2 for Josh Poimboeuf
2025-03-27 11:06 ` tip-bot2 for Josh Poimboeuf
2025-03-28 13:48 ` tip-bot2 for Josh Poimboeuf
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