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s390/pgtable: Make crdte() and cspg() return a value

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Make the crdte() and cspg() wrappers return a boolean to indicate
success, like the other already existing "compare and swap" type of
wrappers.

Add documentation for those functions as well.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2024-06-25 17:13:30 +02:00 committed by Alexander Gordeev
parent d6d1aa519c
commit 02ee149198
1 changed files with 23 additions and 2 deletions
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25
arch/s390/include/asm/pgtable.h
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@ -609,7 +609,15 @@ static inline void csp(unsigned int *ptr, unsigned int old, unsigned int new)
: "cc");
}
static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new)
/**
* cspg() - Compare and Swap and Purge (CSPG)
* @ptr: Pointer to the value to be exchanged
* @old: The expected old value
* @new: The new value
*
* Return: True if compare and swap was successful, otherwise false.
*/
static inline bool cspg(unsigned long *ptr, unsigned long old, unsigned long new)
{
union register_pair r1 = { .even = old, .odd = new, };
unsigned long address = (unsigned long)ptr | 1;
@ -619,6 +627,7 @@ static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new
: [r1] "+&d" (r1.pair), "+m" (*ptr)
: [address] "d" (address)
: "cc");
return old == r1.even;
}
#define CRDTE_DTT_PAGE 0x00UL
@ -627,7 +636,18 @@ static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new
#define CRDTE_DTT_REGION2 0x18UL
#define CRDTE_DTT_REGION1 0x1cUL
static inline void crdte(unsigned long old, unsigned long new,
/**
* crdte() - Compare and Replace DAT Table Entry
* @old: The expected old value
* @new: The new value
* @table: Pointer to the value to be exchanged
* @dtt: Table type of the table to be exchanged
* @address: The address mapped by the entry to be replaced
* @asce: The ASCE of this entry
*
* Return: True if compare and replace was successful, otherwise false.
*/
static inline bool crdte(unsigned long old, unsigned long new,
unsigned long *table, unsigned long dtt,
unsigned long address, unsigned long asce)
{
@ -638,6 +658,7 @@ static inline void crdte(unsigned long old, unsigned long new,
: [r1] "+&d" (r1.pair)
: [r2] "d" (r2.pair), [asce] "a" (asce)
: "memory", "cc");
return old == r1.even;
}
/*