On Sat, 27 Jun 2020 16:20:02 +0000
guoren@xxxxxxxxxx wrote:
> From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
>
> Unfortunately, the current code couldn't be compiled, because
> BUILD_BUG_ON needs a static defined value, not a dynamic
> variable with a0 regs. Just use it inline as a solution.
>
> CC arch/riscv/kernel/patch.o
> In file included from ./include/linux/kernel.h:11,
> from ./include/linux/list.h:9,
> from ./include/linux/preempt.h:11,
> from ./include/linux/spinlock.h:51,
> from arch/riscv/kernel/patch.c:6:
> In function ‘fix_to_virt’,
> inlined from ‘patch_map’ at arch/riscv/kernel/patch.c:37:17:
> ./include/linux/compiler.h:392:38: error: call to ‘__compiletime_assert_205’ declared with attribute error: BUILD_BUG_ON failed: idx >= __end_of_fixed_addresses
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^
> ./include/linux/compiler.h:373:4: note: in definition of macro ‘__compiletime_assert’
> prefix ## suffix(); \
> ^~~~~~
> ./include/linux/compiler.h:392:2: note: in expansion of macro ‘_compiletime_assert’
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:50:2: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
> ^~~~~~~~~~~~~~~~
> ./include/asm-generic/fixmap.h:32:2: note: in expansion of macro ‘BUILD_BUG_ON’
> BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
> ^~~~~~~~~~~~
>
> Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> Cc: Zong Li <zong.li@xxxxxxxxxx>
> ---
> arch/riscv/kernel/patch.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
> index d4a64df..f8e84f2 100644
> --- a/arch/riscv/kernel/patch.c
> +++ b/arch/riscv/kernel/patch.c
> @@ -20,7 +20,7 @@ struct patch_insn {
> };
>
> #ifdef CONFIG_MMU
> -static void *patch_map(void *addr, int fixmap)
> +static inline void *patch_map(void *addr, int fixmap)
Would we be better to use "__always_inline" as same as fix_to_virt?
And also, could you add a comment why we need to make it inline?
Thank you,
> {
> uintptr_t uintaddr = (uintptr_t) addr;
> struct page *page;
> @@ -37,7 +37,6 @@ static void *patch_map(void *addr, int fixmap)
> return (void *)set_fixmap_offset(fixmap, page_to_phys(page) +
> (uintaddr & ~PAGE_MASK));
> }
> -NOKPROBE_SYMBOL(patch_map);
>
> static void patch_unmap(int fixmap)
> {
> --
> 2.7.4
>
--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>
