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io_uring/register: guard compat syscall with CONFIG_COMPAT 

Add compat.h include to avoid a potential build issue:

io_uring/register.c:281:6: error: call to undeclared function 'in_compat_syscall'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]

if (in_compat_syscall()) {
    ^
1 warning generated.
io_uring/register.c:282:9: error: call to undeclared function 'compat_get_bitmap'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
ret = compat_get_bitmap(cpumask_bits(new_mask),
      ^

Fixes: c43203154d ("io_uring/register: move io_uring_register(2) related code to register.c")
Reported-by: Manu Bretelle <chantra@meta.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-01-16 17:08:32 -07:00
parent 3f302388d4
commit baf5977134
1 changed files with 5 additions and 3 deletions
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8
io_uring/register.c
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@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/nospec.h>
#include <linux/compat.h>
#include <linux/io_uring.h>
#include <linux/io_uring_types.h>
@ -278,13 +279,14 @@ static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx,
if (len > cpumask_size())
len = cpumask_size();
if (in_compat_syscall()) {
#ifdef CONFIG_COMPAT
if (in_compat_syscall())
ret = compat_get_bitmap(cpumask_bits(new_mask),
(const compat_ulong_t __user *)arg,
len * 8 /* CHAR_BIT */);
} else {
else
#endif
ret = copy_from_user(new_mask, arg, len);
}
if (ret) {
free_cpumask_var(new_mask);