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riscv: Fix crash during early errata patching 

The patch function for the T-Head PBMT errata calls __pa_symbol() before
relocation. This crashes when CONFIG_DEBUG_VIRTUAL is enabled, because
__pa_symbol() forwards to __phys_addr_symbol(), and __phys_addr_symbol()
checks against the absolute kernel start/end address.

Fix this by checking against the kernel map instead of a symbol address.

Fixes: a35707c3d8 ("riscv: add memory-type errata for T-Head")
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20221126060920.65009-1-samuel@sholland.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Samuel Holland 2022-11-26 00:09:19 -06:00 committed by Palmer Dabbelt
parent 9abf2313ad
commit 0c49688174
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1 changed files with 1 additions and 1 deletions
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2
arch/riscv/mm/physaddr.c
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@ -22,7 +22,7 @@ EXPORT_SYMBOL(__virt_to_phys);
phys_addr_t __phys_addr_symbol(unsigned long x)
{
unsigned long kernel_start = kernel_map.virt_addr;
unsigned long kernel_end = (unsigned long)_end;
unsigned long kernel_end = kernel_start + kernel_map.size;
/*
* Boundary checking aginst the kernel image mapping.