6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dimitris Vlachos dvlachos@ics.forth.gr
[ Upstream commit a11dd49dcb9376776193e15641f84fcc1e5980c9 ]
Offset vmemmap so that the first page of vmemmap will be mapped to the first page of physical memory in order to ensure that vmemmap’s bounds will be respected during pfn_to_page()/page_to_pfn() operations. The conversion macros will produce correct SV39/48/57 addresses for every possible/valid DRAM_BASE inside the physical memory limits.
v2:Address Alex's comments
Suggested-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Dimitris Vlachos dvlachos@ics.forth.gr Reported-by: Dimitris Vlachos dvlachos@ics.forth.gr Closes: https://lore.kernel.org/linux-riscv/20240202135030.42265-1-csd4492@csd.uoc.g... Fixes: d95f1a542c3d ("RISC-V: Implement sparsemem") Reviewed-by: Alexandre Ghiti alexghiti@rivosinc.com Link: https://lore.kernel.org/r/20240229191723.32779-1-dvlachos@ics.forth.gr Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 93c1664361143..c00bd5377db9a 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -84,7 +84,7 @@ * Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled. */ -#define vmemmap ((struct page *)VMEMMAP_START) +#define vmemmap ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT))
#define PCI_IO_SIZE SZ_16M #define PCI_IO_END VMEMMAP_START