diff options
| author | Jayachandran C <jchandra@broadcom.com> | 2013-03-23 17:27:53 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-05-08 01:19:04 +0200 |
| commit | 33ff712aef509ff1b116a46084c96179f8da1d49 (patch) | |
| tree | 2ea35165158d82337ad19c57a7dfa88ea97d0b75 /arch | |
| parent | 042df4fa28a459ac425cea9bc81764532c267ba4 (diff) | |
| download | talos-obmc-linux-33ff712aef509ff1b116a46084c96179f8da1d49.tar.gz talos-obmc-linux-33ff712aef509ff1b116a46084c96179f8da1d49.zip | |
MIPS: Netlogic: Optimize and fix write_c0_eimr()
Remove the irq save/restore from write_c0_eimr(), as it is always called
with interrupts off.
This allows us to remove workaround in write_c0_eimr() to fix up the
flags used by local_irq_save. This fixup worked on XLR, but will break
when 32-bit support is added to r2 cpus like XLP.
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/5022/
Acked-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/netlogic/mips-extns.h | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/arch/mips/include/asm/netlogic/mips-extns.h b/arch/mips/include/asm/netlogic/mips-extns.h index 8ad2e0f81719..69d18a0e0581 100644 --- a/arch/mips/include/asm/netlogic/mips-extns.h +++ b/arch/mips/include/asm/netlogic/mips-extns.h @@ -43,16 +43,15 @@ #define write_c0_eirr(val) __write_64bit_c0_register($9, 6, val) /* - * Writing EIMR in 32 bit is a special case, the lower 8 bit of the - * EIMR is shadowed in the status register, so we cannot save and - * restore status register for split read. + * NOTE: Do not save/restore flags around write_c0_eimr(). + * On non-R2 platforms the flags has part of EIMR that is shadowed in STATUS + * register. Restoring flags will overwrite the lower 8 bits of EIMR. + * + * Call with interrupts disabled. */ #define write_c0_eimr(val) \ do { \ if (sizeof(unsigned long) == 4) { \ - unsigned long __flags; \ - \ - local_irq_save(__flags); \ __asm__ __volatile__( \ ".set\tmips64\n\t" \ "dsll\t%L0, %L0, 32\n\t" \ @@ -62,8 +61,6 @@ do { \ "dmtc0\t%L0, $9, 7\n\t" \ ".set\tmips0" \ : : "r" (val)); \ - __flags = (__flags & 0xffff00ff) | (((val) & 0xff) << 8);\ - local_irq_restore(__flags); \ } else \ __write_64bit_c0_register($9, 7, (val)); \ } while (0) |
