Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
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kernel/sysctl.c
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-7
kernel/sysctl.c
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sysctl_user_to_kern_int_conv_ms,
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sysctl_kern_to_user_int_conv_ms, true)
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static int sysctl_user_to_kern_uint_conv(const unsigned long *u_ptr,
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unsigned int *k_ptr)
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{
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if (*u_ptr > UINT_MAX)
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return -EINVAL;
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WRITE_ONCE(*k_ptr, *u_ptr);
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return 0;
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#define SYSCTL_USER_TO_KERN_UINT_CONV(name, u_ptr_op) \
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int sysctl_user_to_kern_uint_conv##name(const unsigned long *u_ptr,\
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unsigned int *k_ptr) \
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{ \
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unsigned long u = u_ptr_op(*u_ptr); \
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if (u > UINT_MAX) \
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return -EINVAL; \
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WRITE_ONCE(*k_ptr, u); \
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return 0; \
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}
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static SYSCTL_USER_TO_KERN_UINT_CONV(, SYSCTL_CONV_IDENTITY)
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static int sysctl_kern_to_user_uint_conv(unsigned long *u_ptr,
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const unsigned int *k_ptr)