5.15-stable review patch. If anyone has any objections, please let me know.
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From: WangYuli wangyuli@uniontech.com
[ Upstream commit 550c2aa787d1b06efcb11de1877354502a1237f2 ]
[ Quoting Samuel Holland: ]
This is a separate issue, but using ".option rvc" here is a bug. It will unconditionally enable the C extension for the rest of the file, even if the kernel is being built with CONFIG_RISCV_ISA_C=n.
[ Quoting Palmer Dabbelt: ]
We're just looking at the address of kgdb_compiled_break, so it's fine if it ends up as a c.ebreak.
[ Quoting Alexandre Ghiti: ]
.option norvc is used to prevent the assembler from using compressed instructions, but it's generally used when we need to ensure the size of the instructions that are used, which is not the case here as noted by Palmer since we only care about the address. So yes it will work fine with C enabled :)
So let's just remove them all.
Link: https://lore.kernel.org/all/4b4187c1-77e5-44b7-885f-d6826723dd9a@sifive.com/ Link: https://lore.kernel.org/all/mhng-69513841-5068-441d-be8f-2aeebdc56a08@palmer... Link: https://lore.kernel.org/all/23693e7f-4fff-40f3-a437-e06d827278a5@ghiti.fr/ Fixes: fe89bd2be866 ("riscv: Add KGDB support") Cc: Samuel Holland samuel.holland@sifive.com Cc: Palmer Dabbelt palmer@dabbelt.com Cc: Alexandre Ghiti alex@ghiti.fr Signed-off-by: WangYuli wangyuli@uniontech.com Link: https://lore.kernel.org/r/8B431C6A4626225C+20250411073222.56820-2-wangyuli@u... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kernel/kgdb.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/riscv/kernel/kgdb.c b/arch/riscv/kernel/kgdb.c index b0db3350d243b..1d83b36967212 100644 --- a/arch/riscv/kernel/kgdb.c +++ b/arch/riscv/kernel/kgdb.c @@ -276,9 +276,7 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) noinline void arch_kgdb_breakpoint(void) { asm(".global kgdb_compiled_break\n" - ".option norvc\n" - "kgdb_compiled_break: ebreak\n" - ".option rvc\n"); + "kgdb_compiled_break: ebreak\n"); }
void kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,