mirror of https://github.com/torvalds/linux.git
a9b3c355c2
We already have a generic implementation of alloc/free up to P4D level, as
well as pgd_free(). Let's finish the work and add a generic PGD-level
alloc helper as well.
Unlike at lower levels, almost all architectures need some specific magic
at PGD level (typically initialising PGD entries), so introducing a
generic pgd_alloc() isn't worth it. Instead we introduce two new helpers,
__pgd_alloc() and __pgd_free(), and make use of them in the arch-specific
pgd_alloc() and pgd_free() wherever possible. To accommodate as many arch
as possible, __pgd_alloc() takes a page allocation order.
Because pagetable_alloc() allocates zeroed pages, explicit zeroing in
pgd_alloc() becomes redundant and we can get rid of it. Some trivial
implementations of pgd_free() also become unnecessary once __pgd_alloc()
is used; remove them.
Another small improvement is consistent accounting of PGD pages by using
GFP_PGTABLE_{USER,KERNEL} as appropriate.
Not all PGD allocations can be handled by the generic helpers. In
particular, multiple architectures allocate PGDs from a kmem_cache, and
those PGDs may not be page-sized.
Link: https://lkml.kernel.org/r/20250103184415.2744423-6-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>
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| .. | ||
| Kbuild | ||
| asm-compat.h | ||
| asm-offsets.h | ||
| barrier.h | ||
| cache.h | ||
| cacheflush.h | ||
| checksum.h | ||
| cpuinfo.h | ||
| current.h | ||
| delay.h | ||
| dma.h | ||
| elf.h | ||
| entry.h | ||
| exceptions.h | ||
| fixmap.h | ||
| flat.h | ||
| ftrace.h | ||
| futex.h | ||
| hash.h | ||
| highmem.h | ||
| io.h | ||
| irq.h | ||
| irqflags.h | ||
| kgdb.h | ||
| mmu.h | ||
| mmu_context.h | ||
| mmu_context_mm.h | ||
| module.h | ||
| page.h | ||
| pci-bridge.h | ||
| pci.h | ||
| pgalloc.h | ||
| pgtable.h | ||
| processor.h | ||
| ptrace.h | ||
| pvr.h | ||
| registers.h | ||
| seccomp.h | ||
| sections.h | ||
| setup.h | ||
| string.h | ||
| switch_to.h | ||
| syscall.h | ||
| thread_info.h | ||
| timex.h | ||
| tlbflush.h | ||
| uaccess.h | ||
| unistd.h | ||
| unwind.h | ||
| vmalloc.h | ||
| xilinx_mb_manager.h | ||