Vincent Chen f70da80a86 riscv: avoid the PIC offset of static percpu data in module beyond 2G limits ... [ Upstream commit 0cff8bff7af886af0923d5c91776cd51603e531f ] The compiler uses the PIC-relative method to access static variables instead of GOT when the code model is PIC. Therefore, the limitation of the access range from the instruction to the symbol address is +-2GB. Under this circumstance, the kernel cannot load a kernel module if this module has static per-CPU symbols declared by DEFINE_PER_CPU(). The reason is that kernel relocates the .data..percpu section of the kernel module to the end of kernel's .data..percpu. Hence, the distance between the per-CPU symbols and the instruction will exceed the 2GB limits. To solve this problem, the kernel should place the loaded module in the memory area [&_end-2G, VMALLOC_END]. Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Suggested-by: Alexandre Ghiti <alex@ghiti.fr> Suggested-by: Anup Patel <anup@brainfault.org> Tested-by: Alexandre Ghiti <alex@ghiti.fr> Tested-by: Carlos de Paula <me@carlosedp.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-03-25 08:06:07 +01:00
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configs	irqchip: add a SiFive PLIC driver	2018-08-13 08:31:32 -07:00
include	riscv: Make __fstate_clean() work correctly.	2019-08-25 10:47:51 +02:00
kernel	riscv: avoid the PIC offset of static percpu data in module beyond 2G limits	2020-03-25 08:06:07 +01:00
lib	riscv: Fix udelay in RV32.	2019-07-14 08:11:09 +02:00
mm	RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap	2019-12-01 09:16:53 +01:00
Kconfig	kconfig: include kernel/Kconfig.preempt from init/Kconfig	2018-08-02 08:06:54 +09:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	riscv: add missing vdso_install target	2018-12-01 09:37:33 +01:00