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regset(): kill ->get_size()

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not used anymore

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-17 09:57:08 -04:00
parent 1e6986c9db
commit c522401e06
2 changed files with 1 additions and 60 deletions
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13
arch/arm64/kernel/ptrace.c
View File

@ -740,18 +740,6 @@ static unsigned int sve_size_from_header(struct user_sve_header const *header)
return ALIGN(header->size, SVE_VQ_BYTES);
}
static unsigned int sve_get_size(struct task_struct *target,
const struct user_regset *regset)
{
struct user_sve_header header;
if (!system_supports_sve())
return 0;
sve_init_header_from_task(&header, target);
return sve_size_from_header(&header);
}
static int sve_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
@ -1130,7 +1118,6 @@ static const struct user_regset aarch64_regsets[] = {
.align = SVE_VQ_BYTES,
.regset_get = sve_get,
.set = sve_set,
.get_size = sve_get_size,
},
#endif
#ifdef CONFIG_ARM64_PTR_AUTH

48
include/linux/regset.h
View File

@ -132,28 +132,6 @@ typedef int user_regset_writeback_fn(struct task_struct *target,
const struct user_regset *regset,
int immediate);
/**
* user_regset_get_size_fn - type of @get_size function in &struct user_regset
* @target: thread being examined
* @regset: regset being examined
*
* This call is optional; usually the pointer is %NULL.
*
* When provided, this function must return the current size of regset
* data, as observed by the @get function in &struct user_regset. The
* value returned must be a multiple of @size. The returned size is
* required to be valid only until the next time (if any) @regset is
* modified for @target.
*
* This function is intended for dynamically sized regsets. A regset
* that is statically sized does not need to implement it.
*
* This function should not be called directly: instead, callers should
* call regset_size() to determine the current size of a regset.
*/
typedef unsigned int user_regset_get_size_fn(struct task_struct *target,
const struct user_regset *regset);
/**
* struct user_regset - accessible thread CPU state
* @n: Number of slots (registers).
@ -165,7 +143,6 @@ typedef unsigned int user_regset_get_size_fn(struct task_struct *target,
* @set: Function to store values.
* @active: Function to report if regset is active, or %NULL.
* @writeback: Function to write data back to user memory, or %NULL.
* @get_size: Function to return the regset's size, or %NULL.
*
* This data structure describes a machine resource we call a register set.
* This is part of the state of an individual thread, not necessarily
@ -173,12 +150,7 @@ typedef unsigned int user_regset_get_size_fn(struct task_struct *target,
* similar slots, given by @n. Each slot is @size bytes, and aligned to
* @align bytes (which is at least @size). For dynamically-sized
* regsets, @n must contain the maximum possible number of slots for the
* regset, and @get_size must point to a function that returns the
* current regset size.
*
* Callers that need to know only the current size of the regset and do
* not care about its internal structure should call regset_size()
* instead of inspecting @n or calling @get_size.
* regset.
*
* For backward compatibility, the @get and @set methods must pad to, or
* accept, @n * @size bytes, even if the current regset size is smaller.
@ -218,7 +190,6 @@ struct user_regset {
user_regset_set_fn *set;
user_regset_active_fn *active;
user_regset_writeback_fn *writeback;
user_regset_get_size_fn *get_size;
unsigned int n;
unsigned int size;
unsigned int align;
@ -422,21 +393,4 @@ static inline int copy_regset_from_user(struct task_struct *target,
return regset->set(target, regset, offset, size, NULL, data);
}
/**
* regset_size - determine the current size of a regset
* @target: thread to be examined
* @regset: regset to be examined
*
* Note that the returned size is valid only until the next time
* (if any) @regset is modified for @target.
*/
static inline unsigned int regset_size(struct task_struct *target,
const struct user_regset *regset)
{
if (!regset->get_size)
return regset->n * regset->size;
else
return regset->get_size(target, regset);
}
#endif /* <linux/regset.h> */