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RISC-V: Define sys_riscv_flush_icache when SMP=n 

This would be necessary to make non-SMP builds work, but there is
another error in the implementation of our syscall linkage that actually
just causes sys_riscv_flush_icache to never build.  I've build tested
this on allnoconfig and allnoconfig+SMP=y, as well as defconfig like
normal.

CC: Christoph Hellwig <hch@infradead.org>
CC: Guenter Roeck <linux@roeck-us.net>
In-Reply-To: <20180809055830.GA17533@infradead.org>
In-Reply-To: <20180809132612.GA31058@roeck-us.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Palmer Dabbelt 2018-08-09 12:53:57 -07:00
parent 1009aa1205
commit 7847e7052f
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
2 changed files with 10 additions and 4 deletions
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2
arch/riscv/include/asm/vdso.h
View File

@ -38,8 +38,6 @@ struct vdso_data {
(void __user *)((unsigned long)(base) + __vdso_##name); \
})
#ifdef CONFIG_SMP
asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
#endif
#endif /* _ASM_RISCV_VDSO_H */

12
arch/riscv/kernel/sys_riscv.c
View File

@ -48,7 +48,6 @@ SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
}
#endif /* !CONFIG_64BIT */
#ifdef CONFIG_SMP
/*
* Allows the instruction cache to be flushed from userspace. Despite RISC-V
* having a direct 'fence.i' instruction available to userspace (which we
@ -66,15 +65,24 @@ SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
SYSCALL_DEFINE3(riscv_flush_icache, uintptr_t, start, uintptr_t, end,
uintptr_t, flags)
{
#ifdef CONFIG_SMP
struct mm_struct *mm = current->mm;
bool local = (flags & SYS_RISCV_FLUSH_ICACHE_LOCAL) != 0;
#endif
/* Check the reserved flags. */
if (unlikely(flags & ~SYS_RISCV_FLUSH_ICACHE_ALL))
return -EINVAL;
/*
* Without CONFIG_SMP flush_icache_mm is a just a flush_icache_all(),
* which generates unused variable warnings all over this function.
*/
#ifdef CONFIG_SMP
flush_icache_mm(mm, local);
#else
flush_icache_all();
#endif
return 0;
}
#endif