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Message-ID: <0e7ad263-1ff7-446d-81fe-97cff9c0e7ed@lucifer.local>
Date: Tue, 26 Aug 2025 12:33:05 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
"David S . Miller" <davem@...emloft.net>,
Andreas Larsson <andreas@...sler.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
Kees Cook <kees@...nel.org>, David Hildenbrand <david@...hat.com>,
Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
Xu Xin <xu.xin16@....com.cn>,
Chengming Zhou <chengming.zhou@...ux.dev>,
Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
David Rientjes <rientjes@...gle.com>,
Shakeel Butt <shakeel.butt@...ux.dev>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Oleg Nesterov <oleg@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
Jason Gunthorpe <jgg@...pe.ca>, John Hubbard <jhubbard@...dia.com>,
Peter Xu <peterx@...hat.com>, Jann Horn <jannh@...gle.com>,
Pedro Falcato <pfalcato@...e.de>, Matthew Wilcox <willy@...radead.org>,
Mateusz Guzik <mjguzik@...il.com>, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
linux-trace-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 06/10] mm: update coredump logic to correctly use bitmap
mm flags
Hi Andrew,
The arc architecture with a specific randconfig does not like this, so I enclose
a fix-patch to satisfy this case.
>From 04c8084551dbbac3cd1716164e5a19a367be652e Mon Sep 17 00:00:00 2001
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Date: Tue, 26 Aug 2025 12:25:16 +0100
Subject: [PATCH] mm: abstract set_mask_bits() invocation to mm_types.h to
satisfy ARC
There's some horrible recursive header issue for ARCH whereby you can't
even apparently include very fundamental headers like compiler_types.h in
linux/sched/coredump.h.
So work around this by putting the thing that needs this (use of
ACCESS_PRIVATE()) into mm_types.h which presumably in some fashion avoids
this issue.
This also makes it consistent with __mm_flags_get_dumpable() so is a good
change to make things more consistent and neat anyway.
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508240502.frw1Krzo-lkp@intel.com/
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
include/linux/mm_types.h | 12 ++++++++++++
include/linux/sched/coredump.h | 5 +----
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0e001dbad455..205ec614171f 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1255,6 +1255,18 @@ static inline unsigned long __mm_flags_get_word(const struct mm_struct *mm)
return bitmap_read(bitmap, 0, BITS_PER_LONG);
}
+/*
+ * Update the first system word of mm flags ONLY, applying the specified mask to
+ * it, then setting all flags specified by bits.
+ */
+static inline void __mm_flags_set_mask_bits_word(struct mm_struct *mm,
+ unsigned long mask, unsigned long bits)
+{
+ unsigned long *bitmap = ACCESS_PRIVATE(&mm->_flags, __mm_flags);
+
+ set_mask_bits(bitmap, mask, bits);
+}
+
#define MM_MT_FLAGS (MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN | \
MT_FLAGS_USE_RCU)
extern struct mm_struct init_mm;
diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
index 19ecfcceb27a..b7fafe999073 100644
--- a/include/linux/sched/coredump.h
+++ b/include/linux/sched/coredump.h
@@ -2,7 +2,6 @@
#ifndef _LINUX_SCHED_COREDUMP_H
#define _LINUX_SCHED_COREDUMP_H
-#include <linux/compiler_types.h>
#include <linux/mm_types.h>
#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
@@ -20,9 +19,7 @@ static inline unsigned long __mm_flags_get_dumpable(struct mm_struct *mm)
static inline void __mm_flags_set_mask_dumpable(struct mm_struct *mm, int value)
{
- unsigned long *bitmap = ACCESS_PRIVATE(&mm->_flags, __mm_flags);
-
- set_mask_bits(bitmap, MMF_DUMPABLE_MASK, value);
+ __mm_flags_set_mask_bits_word(mm, MMF_DUMPABLE_MASK, value);
}
extern void set_dumpable(struct mm_struct *mm, int value);
--
2.50.1
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