linux-kernel - Re: [BUG] vmlinux.o: warning: objtool: iommu_dma_sw_msi() falls through to next function alloc_io_pgtable

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Message-ID: <6iqec5chiqlsysp2vb7qlfkebzyrdreb3rtm7t7nx3ppiywqya@xj7w7y5r7twh>
Date: Wed, 26 Mar 2025 22:44:54 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org, 
	Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev
Subject: Re: [BUG] vmlinux.o: warning: objtool: iommu_dma_sw_msi() falls
 through to next function alloc_io_pgtable_ops()

On Wed, Mar 26, 2025 at 04:45:52PM -0700, Paul E. McKenney wrote:
> On Wed, Mar 26, 2025 at 04:18:51PM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > Building next-20250326 using clang version 19.1.7 (CentOS 19.1.7-1.el9)
> > gets me the following warning:
> 
> Apologies, but make that gcc version 11.5.0 20240719 (Red Hat 11.5.0-5) (GCC).
> (Hey, it has almost always been clang in the past...)
> 
> Also, the runs that have this problem are the ones whose kernels are
> built with CONFIG_DEBUG_LOCK_ALLOC=y, but that do *not* enable KASAN.
> For rcutorture, these are scenarios SRCU-P, TREE02, TREE05, TASKS01,
> TRACE02, RUDE01, SRCU-T, and TINY02.

Thanks, I posted a fix here:

https://lore.kernel.org/0c801ae017ec078cacd39f8f0898fc7780535f85.1743053325.git.jpoimboe@kernel.org

-- 
Josh