documentation: Fix riscv cmodx example

ON/OFF in the keys was swapped between the first and second argument of
the prctl. The prctl key is always PR_RISCV_SET_ICACHE_FLUSH_CTX, and
the second argument can be PR_RISCV_CTX_SW_FENCEI_ON or
PR_RISCV_CTX_SW_FENCEI_OFF.

Signed-off-by: Charlie Jenkins <[email protected]>
Fixes: 6a08e47 ("documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: charlie-rivos

Documentation/arch/riscv/cmodx.rst

@@ -62,10 +62,10 @@ cmodx.c::
 		printf("Value before cmodx: %d\n", value);
 
 		// Call prctl before first fence.i is called inside modify_instruction
-		prctl(PR_RISCV_SET_ICACHE_FLUSH_CTX_ON, PR_RISCV_CTX_SW_FENCEI, PR_RISCV_SCOPE_PER_PROCESS);
+		prctl(PR_RISCV_SET_ICACHE_FLUSH_CTX, PR_RISCV_CTX_SW_FENCEI_ON, PR_RISCV_SCOPE_PER_PROCESS);
 		modify_instruction();
 		// Call prctl after final fence.i is called in process
-		prctl(PR_RISCV_SET_ICACHE_FLUSH_CTX_OFF, PR_RISCV_CTX_SW_FENCEI, PR_RISCV_SCOPE_PER_PROCESS);
+		prctl(PR_RISCV_SET_ICACHE_FLUSH_CTX, PR_RISCV_CTX_SW_FENCEI_OFF, PR_RISCV_SCOPE_PER_PROCESS);
 
 		value = get_value();
 		printf("Value after cmodx: %d\n", value);