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riscv: mm: stub extable related functions/macros for !MMU

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extable relies on the MMU to work properly, so it's useless to
include __ex_table sections and build extable related functions for
!MMU case.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20230509152641.805-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Jisheng Zhang 2023-05-09 23:26:41 +08:00 committed by Palmer Dabbelt
parent c818fea83d
commit de658bcf03
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
3 changed files with 11 additions and 2 deletions
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6
arch/riscv/include/asm/asm-extable.h
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@ -7,6 +7,8 @@
#define EX_TYPE_BPF 2
#define EX_TYPE_UACCESS_ERR_ZERO 3
#ifdef CONFIG_MMU
#ifdef __ASSEMBLY__
#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
@ -62,4 +64,8 @@
#endif /* __ASSEMBLY__ */
#else /* CONFIG_MMU */
#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)
#endif /* CONFIG_MMU */
#endif /* __ASM_ASM_EXTABLE_H */

4
arch/riscv/include/asm/extable.h
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@ -32,7 +32,11 @@ do { \
(b)->data = (tmp).data; \
} while (0)
#ifdef CONFIG_MMU
bool fixup_exception(struct pt_regs *regs);
#else
static inline bool fixup_exception(struct pt_regs *regs) { return false; }
#endif
#if defined(CONFIG_BPF_JIT) && defined(CONFIG_ARCH_RV64I)
bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs);

3
arch/riscv/mm/Makefile
View File

@ -13,8 +13,7 @@ endif
KCOV_INSTRUMENT_init.o := n
obj-y += init.o
obj-y += extable.o
obj-$(CONFIG_MMU) += fault.o pageattr.o
obj-$(CONFIG_MMU) += extable.o fault.o pageattr.o
obj-y += cacheflush.o
obj-y += context.o
obj-y += pgtable.o