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Warn for unused results

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Imbus 2025-08-18 11:17:10 +02:00
parent 1aed6c0715
commit ee2ddd7e8c
2 changed files with 2 additions and 1 deletions
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1
Makefile
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@ -12,6 +12,7 @@ LDFLAGS = -Tkernel.ld
LDFLAGS += -m elf64lriscv LDFLAGS += -m elf64lriscv
CFLAGS = -Wall -Werror -O CFLAGS = -Wall -Werror -O
CFLAGS += -Wno-unused-result
CFLAGS += -mcmodel=medany CFLAGS += -mcmodel=medany
CFLAGS += -march=rv64gc -mabi=lp64 CFLAGS += -march=rv64gc -mabi=lp64
CFLAGS += -ffreestanding -fno-common -nostdlib -mno-relax CFLAGS += -ffreestanding -fno-common -nostdlib -mno-relax

2
kern/ispinlock.c
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@ -4,7 +4,7 @@ void spinlock_init(spinlock_t *l) {
l->v = 0; l->v = 0;
} }
bool spin_trylock(spinlock_t *l) { __attribute__((warn_unused_result)) bool spin_trylock(spinlock_t *l) {
uint32_t old; uint32_t old;
// old = xchg_acquire(&l->v, 1) using AMO // old = xchg_acquire(&l->v, 1) using AMO
__asm__ volatile("amoswap.w.aq %0, %2, (%1)\n" : "=&r"(old) : "r"(&l->v), "r"(1u) : "memory"); __asm__ volatile("amoswap.w.aq %0, %2, (%1)\n" : "=&r"(old) : "r"(&l->v), "r"(1u) : "memory");