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SubjectRe: [PATCH] initity: try to improve __nocapture annotations
On Wed, Feb 1, 2017 at 5:11 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> There are some additional declarations that got missed in the original patch,
> and some annotated functions that use the pointer is a correct but nonobvious
> way:
>
> mm/kasan/kasan.c: In function 'memmove':
> mm/kasan/kasan.c:346:7: error: 'memmove' captures its 2 ('src') parameter, please remove it from the nocapture attribute. [-Werror]
> void *memmove(void *dest, const void *src, size_t len)
> ^~~~~~~
> mm/kasan/kasan.c: In function 'memcpy':
> mm/kasan/kasan.c:355:7: error: 'memcpy' captures its 2 ('src') parameter, please remove it from the nocapture attribute. [-Werror]
> void *memcpy(void *dest, const void *src, size_t len)
> ^~~~~~
> drivers/acpi/acpica/utdebug.c: In function 'acpi_debug_print':
> drivers/acpi/acpica/utdebug.c:158:1: error: 'acpi_debug_print' captures its 3 ('function_name') parameter, please remove it from the nocapture attribute. [-Werror]
>
> lib/string.c:893:7: error: 'memchr_inv' captures its 1 ('start') parameter, please remove it from the nocapture attribute. [-Werror]
> void *memchr_inv(const void *start, int c, size_t bytes)
> lib/string.c: In function 'strnstr':
> lib/string.c:832:7: error: 'strnstr' captures its 1 ('s1') parameter, please remove it from the nocapture attribute. [-Werror]
> char *strnstr(const char *s1, const char *s2, size_t len)
> ^~~~~~~
> lib/string.c:832:7: error: 'strnstr' captures its 2 ('s2') parameter, please remove it from the nocapture attribute. [-Werror]
>
> I'm not sure if these are all appropriate fixes, please have a careful look
>
> Fixes: c2bc07665495 ("initify: Mark functions with the __nocapture attribute")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> drivers/acpi/acpica/utdebug.c | 2 +-
> include/acpi/acpixf.h | 2 +-
> include/asm-generic/asm-prototypes.h | 8 ++++----
> include/linux/string.h | 2 +-
> lib/string.c | 2 +-
> mm/kasan/kasan.c | 4 ++--
> 6 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/acpi/acpica/utdebug.c b/drivers/acpi/acpica/utdebug.c
> index 044df9b0356e..de3c9cb305a2 100644
> --- a/drivers/acpi/acpica/utdebug.c
> +++ b/drivers/acpi/acpica/utdebug.c
> @@ -154,7 +154,7 @@ static const char *acpi_ut_trim_function_name(const char *function_name)
> *
> ******************************************************************************/
>
> -void ACPI_INTERNAL_VAR_XFACE
> +void __unverified_nocapture(3) ACPI_INTERNAL_VAR_XFACE

Generally speaking, there is a problem with adding annotations like
this to ACPICA code.

We get that code from an external project (upstream ACPICA) and the
more Linux-specific stuff is there in it, the more difficult to
maintain it becomes.

Thanks,
Rafael

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