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
..
boot	riscv: dts: starfive: Remove PMIC interrupt info for Visionfive 2 board	2024-06-16 13:47:45 +02:00
configs	Kbuild updates for v6.6	2023-09-05 11:01:47 -07:00
errata	riscv: errata: andes: Probe for IOCP only once in boot stage	2023-12-13 18:45:19 +01:00
include	riscv: Fix loading 64-bit NOMMU kernels past the start of RAM	2024-05-02 16:32:49 +02:00
kernel	kprobe/ftrace: bail out if ftrace was killed	2024-06-27 13:49:03 +02:00
kvm	RISC-V: KVM: Fix incorrect reg_subtype labels in kvm_riscv_vcpu_set_reg_isa_ext function	2024-06-21 14:38:14 +02:00
lib	riscv: uaccess: Return the number of bytes effectively not copied	2023-08-16 07:30:06 -07:00
mm	riscv: force PAGE_SIZE linear mapping if debug_pagealloc is enabled	2024-06-27 13:49:15 +02:00
net	riscv, bpf: make some atomic operations fully ordered	2024-06-12 11:11:54 +02:00
purgatory	riscv/purgatory: Disable CFI	2023-08-23 14:16:40 -07:00
tools	riscv: Check relocations at compile time	2023-04-19 07:46:32 -07:00
Kbuild	kexec: rename ARCH_HAS_KEXEC_PURGATORY	2023-08-18 10:18:54 -07:00
Kconfig	RISC-V: Drop invalid test from CONFIG_AS_HAS_OPTION_ARCH	2024-03-06 14:48:41 +00:00
Kconfig.debug
Kconfig.errata	riscv: only select DMA_DIRECT_REMAP from RISCV_ISA_ZICBOM and ERRATA_THEAD_PBMT	2023-10-26 09:42:38 +02:00
Kconfig.socs	riscv: Kconfig: Add select ARM_AMBA to SOC_STARFIVE	2023-12-13 18:45:35 +01:00
Makefile	kbuild: unify vdso_install rules	2024-06-12 11:12:32 +02:00
Makefile.postlink	riscv: Use --emit-relocs in order to move .rela.dyn in init	2023-04-19 07:46:33 -07:00