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: a35707c ("riscv: add memory-type errata for T-Head")
Reviewed-by: Heiko Stuebner <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: smaeul

arch/riscv/mm/physaddr.c

@@ -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.