Messages in this thread | | | Subject | Re: [PATCH 1/3] riscv: Fix memory_limit for 64-bit kernel | From | Alex Ghiti <> | Date | Thu, 1 Jul 2021 21:01:10 +0200 |
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Le 1/07/2021 à 12:44, Kefeng Wang a écrit : > > On 2021/6/29 17:13, Alexandre Ghiti wrote: >> As described in Documentation/riscv/vm-layout.rst, the end of the >> virtual address space for 64-bit kernel is occupied by the modules/BPF/ >> kernel mappings so this actually reduces the amount of memory we are able >> to map and then use in the linear mapping. So make sure this limit is >> correctly set. >> >> Fixes: c9811e379b21 ("riscv: Add mem kernel parameter support") > > > Should the Fixes tag be de043da0b9e7 (“RISC-V: Fix usage of > memblock_enforce_memory_limit“), > > The -PAGE_OFFSET is set to the maximal physical memory from this point :)
Oops, thank you!
Alex
> >> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> >> --- >> arch/riscv/mm/init.c | 11 +++++++++-- >> 1 file changed, 9 insertions(+), 2 deletions(-) >> >> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c >> index 12f956b3a674..04a5db3a9788 100644 >> --- a/arch/riscv/mm/init.c >> +++ b/arch/riscv/mm/init.c >> @@ -124,10 +124,17 @@ void __init mem_init(void) >> } >> /* >> - * The default maximal physical memory size is -PAGE_OFFSET, >> - * limit the memory size via mem. >> + * The default maximal physical memory size is -PAGE_OFFSET for >> 32-bit kernel, >> + * whereas for 64-bit kernel, the end of the virtual address space is >> occupied >> + * by the modules/BPF/kernel mappings which reduces the available >> size of the >> + * linear mapping. >> + * Limit the memory size via mem. >> */ >> +#ifdef CONFIG_64BIT >> +static phys_addr_t memory_limit = -PAGE_OFFSET - SZ_4G; >> +#else >> static phys_addr_t memory_limit = -PAGE_OFFSET; >> +#endif >> static int __init early_mem(char *p) >> { > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
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