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| author | Heiko Carstens <hca@linux.ibm.com> | 2023-10-06 16:42:42 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2023-10-16 14:04:09 +0300 |
| commit | 802ba53eefc592a6a82231f74e19bafe3256f172 (patch) | |
| tree | 2c9fa712b9d5c17f8a83a7800c64c471534dd143 /arch/s390/mm/extable.c | |
| parent | 76292d7243f809486ec26dd6cd3436dbcb9e5319 (diff) | |
| download | linux-802ba53eefc592a6a82231f74e19bafe3256f172.tar.xz | |
s390: add support for DCACHE_WORD_ACCESS
Implement load_unaligned_zeropad() and enable DCACHE_WORD_ACCESS to
speed up string operations in fs/dcache.c and fs/namei.c.
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/mm/extable.c')
| -rw-r--r-- | arch/s390/mm/extable.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/mm/extable.c b/arch/s390/mm/extable.c index fe87291df95d..0a0738a473af 100644 --- a/arch/s390/mm/extable.c +++ b/arch/s390/mm/extable.c @@ -61,6 +61,22 @@ static bool ex_handler_ua_load_reg(const struct exception_table_entry *ex, return true; } +static bool ex_handler_zeropad(const struct exception_table_entry *ex, struct pt_regs *regs) +{ + unsigned int reg_addr = FIELD_GET(EX_DATA_REG_ADDR, ex->data); + unsigned int reg_data = FIELD_GET(EX_DATA_REG_ERR, ex->data); + unsigned long data, addr, offset; + + addr = regs->gprs[reg_addr]; + offset = addr & (sizeof(unsigned long) - 1); + addr &= ~(sizeof(unsigned long) - 1); + data = *(unsigned long *)addr; + data <<= BITS_PER_BYTE * offset; + regs->gprs[reg_data] = data; + regs->psw.addr = extable_fixup(ex); + return true; +} + bool fixup_exception(struct pt_regs *regs) { const struct exception_table_entry *ex; @@ -81,6 +97,8 @@ bool fixup_exception(struct pt_regs *regs) return ex_handler_ua_load_reg(ex, false, regs); case EX_TYPE_UA_LOAD_REGPAIR: return ex_handler_ua_load_reg(ex, true, regs); + case EX_TYPE_ZEROPAD: + return ex_handler_zeropad(ex, regs); } panic("invalid exception table entry"); } |