[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250901091916.3002082-6-max.kellermann@ionos.com>
Date: Mon, 1 Sep 2025 11:19:08 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: akpm@...ux-foundation.org,
david@...hat.com,
axelrasmussen@...gle.com,
yuanchu@...gle.com,
willy@...radead.org,
hughd@...gle.com,
mhocko@...e.com,
linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
lorenzo.stoakes@...cle.com,
Liam.Howlett@...cle.com,
vbabka@...e.cz,
rppt@...nel.org,
surenb@...gle.com,
vishal.moola@...il.com,
linux@...linux.org.uk,
James.Bottomley@...senPartnership.com,
deller@....de,
agordeev@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com,
hca@...ux.ibm.com,
gor@...ux.ibm.com,
borntraeger@...ux.ibm.com,
svens@...ux.ibm.com,
davem@...emloft.net,
andreas@...sler.com,
dave.hansen@...ux.intel.com,
luto@...nel.org,
peterz@...radead.org,
tglx@...utronix.de,
mingo@...hat.com,
bp@...en8.de,
x86@...nel.org,
hpa@...or.com,
chris@...kel.net,
jcmvbkbc@...il.com,
viro@...iv.linux.org.uk,
brauner@...nel.org,
jack@...e.cz,
weixugc@...gle.com,
baolin.wang@...ux.alibaba.com,
rientjes@...gle.com,
shakeel.butt@...ux.dev,
max.kellermann@...os.com,
thuth@...hat.com,
broonie@...nel.org,
osalvador@...e.de,
jfalempe@...hat.com,
mpe@...erman.id.au,
nysal@...ux.ibm.com,
linux-arm-kernel@...ts.infradead.org,
linux-parisc@...r.kernel.org,
linux-s390@...r.kernel.org,
sparclinux@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: [PATCH v4 05/12] mm/oom_kill: add const to pointer parameter for improved const-correctness
The memory management (mm) subsystem is a fundamental low-level component
of the Linux kernel. Establishing const-correctness at this foundational
level enables higher-level subsystems, such as filesystems and drivers,
to also adopt const-correctness in their interfaces. This patch lays
the groundwork for broader const-correctness throughout the kernel
by starting with the core mm subsystem.
This patch adds const qualifiers to task_struct and mm_struct pointer
parameters in the OOM killer code that do not modify the referenced
memory, improving type safety and enabling compiler optimizations.
Functions improved:
- process_shares_mm()
Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
include/linux/mm.h | 2 +-
mm/oom_kill.c | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 18deb14cb1f5..f70c6b4d5f80 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3840,7 +3840,7 @@ static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
}
#endif /* __HAVE_ARCH_GATE_AREA */
-extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
+bool process_shares_mm(const struct task_struct *p, const struct mm_struct *mm);
void drop_slab(void);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 17650f0b516e..2620b32a8eba 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -490,7 +490,8 @@ static bool oom_killer_disabled __read_mostly;
* task's threads: if one of those is using this mm then this task was also
* using it.
*/
-bool process_shares_mm(struct task_struct *p, struct mm_struct *mm)
+bool process_shares_mm(const struct task_struct *const p,
+ const struct mm_struct *const mm)
{
struct task_struct *t;
--
2.47.2
Powered by blists - more mailing lists