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Message-ID: <d0ed628f-709e-484d-bfda-3c4410a21e40@lucifer.local>
Date: Tue, 2 Sep 2025 07:15:26 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Max Kellermann <max.kellermann@...os.com>
Cc: 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,
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,
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dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
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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: Re: [PATCH v6 08/12] mm: constify arch_pick_mmap_layout() for
improved const-correctness
On Mon, Sep 01, 2025 at 10:50:17PM +0200, Max Kellermann wrote:
> This function only reads from the rlimit pointer (but writes to the
> mm_struct pointer which is kept without `const`).
>
> All callees are already const-ified or (internal functions) are being
> constified by this patch.
>
> Signed-off-by: Max Kellermann <max.kellermann@...os.com>
> Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
LGTM, so:
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> ---
> arch/s390/mm/mmap.c | 4 ++--
> arch/sparc/kernel/sys_sparc_64.c | 2 +-
> arch/x86/mm/mmap.c | 6 +++---
> include/linux/sched/mm.h | 4 ++--
> mm/util.c | 6 +++---
> 5 files changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
> index e188cb6d4946..197c1d9497a7 100644
> --- a/arch/s390/mm/mmap.c
> +++ b/arch/s390/mm/mmap.c
> @@ -47,7 +47,7 @@ static unsigned long mmap_base_legacy(unsigned long rnd)
> }
>
> static inline unsigned long mmap_base(unsigned long rnd,
> - struct rlimit *rlim_stack)
> + const struct rlimit *rlim_stack)
> {
> unsigned long gap = rlim_stack->rlim_cur;
> unsigned long pad = stack_maxrandom_size() + stack_guard_gap;
> @@ -169,7 +169,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad
> * This function, called very early during the creation of a new
> * process VM image, sets up which VM layout function to use:
> */
> -void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> +void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack)
> {
> unsigned long random_factor = 0UL;
>
> diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
> index 785e9909340f..55faf2effa46 100644
> --- a/arch/sparc/kernel/sys_sparc_64.c
> +++ b/arch/sparc/kernel/sys_sparc_64.c
> @@ -294,7 +294,7 @@ static unsigned long mmap_rnd(void)
> return rnd << PAGE_SHIFT;
> }
>
> -void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> +void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack)
> {
> unsigned long random_factor = mmap_rnd();
> unsigned long gap;
> diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
> index 708f85dc9380..82f3a987f7cf 100644
> --- a/arch/x86/mm/mmap.c
> +++ b/arch/x86/mm/mmap.c
> @@ -80,7 +80,7 @@ unsigned long arch_mmap_rnd(void)
> }
>
> static unsigned long mmap_base(unsigned long rnd, unsigned long task_size,
> - struct rlimit *rlim_stack)
> + const struct rlimit *rlim_stack)
> {
> unsigned long gap = rlim_stack->rlim_cur;
> unsigned long pad = stack_maxrandom_size(task_size) + stack_guard_gap;
> @@ -110,7 +110,7 @@ static unsigned long mmap_legacy_base(unsigned long rnd,
> */
> static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
> unsigned long random_factor, unsigned long task_size,
> - struct rlimit *rlim_stack)
> + const struct rlimit *rlim_stack)
> {
> *legacy_base = mmap_legacy_base(random_factor, task_size);
> if (mmap_is_legacy())
> @@ -119,7 +119,7 @@ static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
> *base = mmap_base(random_factor, task_size, rlim_stack);
> }
>
> -void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> +void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack)
> {
> if (mmap_is_legacy())
> mm_flags_clear(MMF_TOPDOWN, mm);
> diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
> index 2201da0afecc..0232d983b715 100644
> --- a/include/linux/sched/mm.h
> +++ b/include/linux/sched/mm.h
> @@ -178,7 +178,7 @@ static inline void mm_update_next_owner(struct mm_struct *mm)
> #endif
>
> extern void arch_pick_mmap_layout(struct mm_struct *mm,
> - struct rlimit *rlim_stack);
> + const struct rlimit *rlim_stack);
>
> unsigned long
> arch_get_unmapped_area(struct file *filp, unsigned long addr,
> @@ -211,7 +211,7 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
> unsigned long flags, vm_flags_t vm_flags);
> #else
> static inline void arch_pick_mmap_layout(struct mm_struct *mm,
> - struct rlimit *rlim_stack) {}
> + const struct rlimit *rlim_stack) {}
> #endif
>
> static inline bool in_vfork(struct task_struct *tsk)
> diff --git a/mm/util.c b/mm/util.c
> index 241d2eaf26ca..77462027ad24 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -431,7 +431,7 @@ static int mmap_is_legacy(const struct rlimit *rlim_stack)
> #define MIN_GAP (SZ_128M)
> #define MAX_GAP (STACK_TOP / 6 * 5)
>
> -static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
> +static unsigned long mmap_base(const unsigned long rnd, const struct rlimit *rlim_stack)
> {
> #ifdef CONFIG_STACK_GROWSUP
> /*
> @@ -462,7 +462,7 @@ static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
> #endif
> }
>
> -void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> +void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack)
> {
> unsigned long random_factor = 0UL;
>
> @@ -478,7 +478,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> }
> }
> #elif defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
> -void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> +void arch_pick_mmap_layout(struct mm_struct *mm, const struct rlimit *rlim_stack)
> {
> mm->mmap_base = TASK_UNMAPPED_BASE;
> mm_flags_clear(MMF_TOPDOWN, mm);
> --
> 2.47.2
>
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