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 qualifier to the rlimit pointer parameter in
parisc's mmap_upper_limit() function that does not modify the referenced
memory, improving type safety and enabling compiler optimizations.
Functions improved:
- mmap_upper_limit()
Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
---
arch/parisc/include/asm/processor.h | 2 +-
arch/parisc/kernel/sys_parisc.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h
index 4c14bde39aac..dd0b5e199559 100644
--- a/arch/parisc/include/asm/processor.h
+++ b/arch/parisc/include/asm/processor.h
@@ -48,7 +48,7 @@
#ifndef __ASSEMBLER__
struct rlimit;
-unsigned long mmap_upper_limit(struct rlimit *rlim_stack);
+unsigned long mmap_upper_limit(const struct rlimit *rlim_stack);
unsigned long calc_max_stack_size(unsigned long stack_max);
/*
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index f852fe274abe..c2bbaef7e6b7 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -77,7 +77,7 @@ unsigned long calc_max_stack_size(unsigned long stack_max)
* indicating that "current" should be used instead of a passed-in
* value from the exec bprm as done with arch_pick_mmap_layout().
*/
-unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
+unsigned long mmap_upper_limit(const struct rlimit *const rlim_stack)
{
unsigned long stack_base;
--
2.47.2
