Nam Cao 05f263c166 riscv: force PAGE_SIZE linear mapping if debug_pagealloc is enabled ... [ Upstream commit c67ddf59ac ] debug_pagealloc is a debug feature which clears the valid bit in page table entry for freed pages to detect illegal accesses to freed memory. For this feature to work, virtual mapping must have PAGE_SIZE resolution. (No, we cannot map with huge pages and split them only when needed; because pages can be allocated/freed in atomic context and page splitting cannot be done in atomic context) Force linear mapping to use small pages if debug_pagealloc is enabled. Note that it is not necessary to force the entire linear mapping, but only those that are given to memory allocator. Some parts of memory can keep using huge page mapping (for example, kernel's executable code). But these parts are minority, so keep it simple. This is just a debug feature, some extra overhead should be acceptable. Fixes: 5fde3db5eb ("riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support") Signed-off-by: Nam Cao <namcao@linutronix.de> Cc: stable@vger.kernel.org Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/2e391fa6c6f9b3fcf1b41cefbace02ee4ab4bf59.1715750938.git.namcao@linutronix.de Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-27 13:49:15 +02:00
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cache-ops.c	riscv: split cache ops out of dma-noncoherent.c	2023-11-28 17:19:49 +00:00
cacheflush.c	riscv: implement the new page table range API	2023-08-24 16:20:23 -07:00
context.c	riscv: mm: use bitmap_zero() API	2023-08-31 00:18:29 -07:00
dma-noncoherent.c	riscv: split cache ops out of dma-noncoherent.c	2023-11-28 17:19:49 +00:00
extable.c	riscv: extable: fix err reg writing in dedicated uaccess handler	2022-02-08 17:02:47 -08:00
fault.c	riscv: handle VM_FAULT_[HWPOISON|HWPOISON_LARGE] faults instead of panicking	2023-10-06 14:11:38 -07:00
hugetlbpage.c	riscv: Fix build error if !CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION	2024-03-06 14:48:37 +00:00
init.c	riscv: force PAGE_SIZE linear mapping if debug_pagealloc is enabled	2024-06-27 13:49:15 +02:00
kasan_init.c	RISC-V Patches for the 6.6 Merge Window, Part 1	2023-09-01 08:09:48 -07:00
Makefile	riscv: split cache ops out of dma-noncoherent.c	2023-11-28 17:19:49 +00:00
pageattr.c	riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context	2024-06-21 14:38:42 +02:00
pgtable.c	riscv: mm: Implement pmdp_collapse_flush for THP	2023-02-01 20:52:09 -08:00
physaddr.c	riscv: Use PUD/P4D/PGD pages for the linear mapping	2023-04-18 20:43:04 -07:00
pmem.c	riscv: mm: dma-noncoherent: nonstandard cache operations support	2023-09-01 09:08:57 -07:00
ptdump.c	riscv: correct pt_level name via pgtable_l5/4_enabled	2023-11-28 17:20:13 +00:00
tlbflush.c	riscv: mm: execute local TLB flush after populating vmemmap	2024-02-16 19:10:52 +01:00