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sysctl: Create macro for user-to-kernel uint converter 

Replace sysctl_user_to_kern_uint_conv function with
SYSCTL_USER_TO_KERN_UINT_CONV macro that accepts u_ptr_op parameter for
value transformation. Replacing sysctl_kern_to_user_uint_conv is not
needed as it will only be used from within sysctl.c. This is a
preparation commit for creating a custom converter in fs/pipe.c. No
Functional changes are intended.

Signed-off-by: Joel Granados <joel.granados@kernel.org>
This commit is contained in:
Joel Granados 2025-10-16 10:22:16 +02:00
parent 0c1d2dc7cc
commit c3102febf4
1 changed files with 11 additions and 7 deletions
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18
kernel/sysctl.c
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@ -462,15 +462,19 @@ static SYSCTL_INT_CONV_CUSTOM(_ms_jiffies_minmax,
sysctl_user_to_kern_int_conv_ms, sysctl_user_to_kern_int_conv_ms,
sysctl_kern_to_user_int_conv_ms, true) sysctl_kern_to_user_int_conv_ms, true)
static int sysctl_user_to_kern_uint_conv(const unsigned long *u_ptr, #define SYSCTL_USER_TO_KERN_UINT_CONV(name, u_ptr_op) \
unsigned int *k_ptr) int sysctl_user_to_kern_uint_conv##name(const unsigned long *u_ptr,\
{ unsigned int *k_ptr) \
if (*u_ptr > UINT_MAX) { \
return -EINVAL; unsigned long u = u_ptr_op(*u_ptr); \
WRITE_ONCE(*k_ptr, *u_ptr); if (u > UINT_MAX) \
return 0; return -EINVAL; \
WRITE_ONCE(*k_ptr, u); \
return 0; \
} }
static SYSCTL_USER_TO_KERN_UINT_CONV(, SYSCTL_CONV_IDENTITY)
static int sysctl_kern_to_user_uint_conv(unsigned long *u_ptr, static int sysctl_kern_to_user_uint_conv(unsigned long *u_ptr,
const unsigned int *k_ptr) const unsigned int *k_ptr)
{ {