raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2025-12-25 19:42:19 +00:00
Code Issues Projects Releases Wiki Activity

mm: introduce ctor/dtor at PGD level

Browse Source 
Following on from the introduction of P4D-level ctor/dtor, let's finish
the job and introduce ctor/dtor at PGD level.  The incurred improvement in
page accounting is minimal - the main motivation is to create a single,
generic place where construction/destruction hooks can be added for all
page table pages.

This patch should cover all architectures and all configurations where
PGDs are one or more regular pages.  This excludes any configuration where
PGDs are allocated from a kmem_cache object.

Link: https://lkml.kernel.org/r/20250103184415.2744423-7-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kevin Brodsky
2025-01-03 18:44:15 +00:00
committed by Andrew Morton
parent a9b3c355c2
commit d95936a226
5 changed files with 21 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/asm-generic/pgalloc.h
View File

@@ -271,6 +271,7 @@ static inline pgd_t *__pgd_alloc_noprof(struct mm_struct *mm, unsigned int order
if (!ptdesc)
return NULL;
pagetable_pgd_ctor(ptdesc);
return ptdesc_address(ptdesc);
}
#define __pgd_alloc(...) alloc_hooks(__pgd_alloc_noprof(__VA_ARGS__))
@@ -280,7 +281,7 @@ static inline void __pgd_free(struct mm_struct *mm, pgd_t *pgd)
struct ptdesc *ptdesc = virt_to_ptdesc(pgd);
BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
pagetable_free(ptdesc);
pagetable_dtor_free(ptdesc);
}
#ifndef __HAVE_ARCH_PGD_FREE