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documentation: Fix riscv cmodx example

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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 <charlie@rivosinc.com>
Fixes: 6a08e4709c ("documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl")
Link: https://lore.kernel.org/r/20240628-fix_cmodx_example-v1-1-e6c6523bc163@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Charlie Jenkins
2024-06-28 17:25:49 -07:00
committed by Palmer Dabbelt
parent 22a40d14b5
commit 7c5d838d70
1 changed files with 2 additions and 2 deletions
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Documentation/arch/riscv/cmodx.rst
+2 -2
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@@ -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);