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| author | Claudio Imbrenda <imbrenda@linux.ibm.com> | 2024-06-25 17:13:30 +0200 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-07-02 10:17:16 +0200 |
| commit | 02ee149198b4e4ad1a5b9e4c7806f924609b5fb3 (patch) | |
| tree | fff256ed20b152f5001b2aaf16d745629de73232 | |
| parent | s390/topology: Remove CPU KOBJ_CHANGE uevents (diff) | |
| download | linux-02ee149198b4e4ad1a5b9e4c7806f924609b5fb3.tar.xz linux-02ee149198b4e4ad1a5b9e4c7806f924609b5fb3.zip | |
s390/pgtable: Make crdte() and cspg() return a value
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>
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 0fd5a9c7e901..b5632dbe5438 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -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; } /* |