linux-kernel - Re: [GIT PULL] x86/mm changes for v6.8

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Message-ID: <ZZ0DsS7LGJO0NAq6@gmail.com>
Date: Tue, 9 Jan 2024 09:28:33 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, the arch/x86 maintainers <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [GIT PULL] x86/mm changes for v6.8


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, 8 Jan 2024 at 03:35, Ingo Molnar <mingo@...nel.org> wrote:
> >
> >  - Robustify pfn_to_kaddr()
> >
> >  - Improve the __untagged_addr() code: RIP-relative addresses are fine these days
> >    and generate better code, and update misleading/outdated comments as well.
> 
> This does not even compile for me.
> 
>   arch/x86/include/asm/uaccess_64.h: In function ‘__untagged_addr’:
>   arch/x86/include/asm/uaccess_64.h:25:28: error: implicit declaration
> of function ‘__my_cpu_var’; did you mean ‘put_cpu_var’?
> [-Werror=implicit-function-declaration]
> 
> WTH?
> 
> Maybe this has worked in your tree by mistake because there was some
> branch dependency that just happened to work out because you had
> merged things in a different order.
> 
> But that would very much not be ok regardless. Those branches should
> be tested independently, and clearly they were not.

Sorry about that and agreed. Indeed the build failure was hidden by another 
branch, and while I did test-build and test-boot the x86/mm branch before 
sending it out, but my test config didn't have CONFIG_ADDRESS_MASKING=y ... 
which ... masked the build failure. The bots that do per-tree testing 
didn't catch this either.

I've now sorted it out in our trees, will send the new x86/mm in a few days.

Thanks,

	Ingo