linux-kernel - Re: [PATCH v3 23/38] x86/resctrl: Allow an architecture to disable pseudo lock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87frsfd362.fsf@rasp.cworth.amperemail.amperecomputing.com>
Date: Thu, 11 Jul 2024 14:33:41 -0700
From: Carl Worth <carl@...amperecomputing.com>
To: James Morse <james.morse@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>, Reinette Chatre
 <reinette.chatre@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo
 Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, H Peter Anvin
 <hpa@...or.com>, Babu Moger <Babu.Moger@....com>, James Morse
 <james.morse@....com>, shameerali.kolothum.thodi@...wei.com, D Scott
 Phillips OS <scott@...amperecomputing.com>, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>, Xin
 Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com, David Hildenbrand
 <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>, Dave Martin
 <dave.martin@....com>, Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v3 23/38] x86/resctrl: Allow an architecture to disable
 pseudo lock

James Morse <james.morse@....com> writes:
> diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
> index 4a06c37b9cf1..0c13b0befd8a 100644
> --- a/arch/x86/kernel/cpu/resctrl/Makefile
> +++ b/arch/x86/kernel/cpu/resctrl/Makefile
> @@ -1,4 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -obj-$(CONFIG_X86_CPU_RESCTRL)	+= core.o rdtgroup.o monitor.o
> -obj-$(CONFIG_X86_CPU_RESCTRL)	+= ctrlmondata.o pseudo_lock.o
> +obj-$(CONFIG_X86_CPU_RESCTRL)		+= core.o rdtgroup.o monitor.o
> +obj-$(CONFIG_X86_CPU_RESCTRL)		+= ctrlmondata.o
> +obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
>  CFLAGS_pseudo_lock.o = -I$(src)

Now that pseudo_lock.c is only conditionally compiled, the work it's
doing to define tracepoints, (that is, #define CREATE_TRACE_POINTS),
should be moved to monitor.c which is unconditionally compiled.

And then, the CFLAGS line above should be adjusted to apply to
the compilation of monitor.c, that is:

CFLAGS_monitor.o = -I$(src)

Without these changes, compiling without CONFIG_RESCTRL_FS_PSEUDO_LOCK
will fail due to undefined tracepoint functions.

-Carl