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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-19 00:26:41 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-19 00:26:41 (GMT) |
| commit | 22943a6a6ba3bbbf5cc11cec409e779374e88107 (patch) | |
| tree | 9cd343f44c81bc0ca404948707a05604ccbc90ec /arch/arc/include | |
| parent | 39757e7351f874a614a46d634c415ca69e154e53 (diff) | |
| parent | 7a70bf797a587205991b8e3153d764561de867de (diff) | |
| download | linux-22943a6a6ba3bbbf5cc11cec409e779374e88107.tar.xz | |
Merge tag 'arc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull arch/arc updates from Vineet Gupta:
"Minor updates for ARC for 3.19"
* tag 'arc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
ARC: rename default defconfig
ARC: [nsimosci] move peripherals to match model to FPGA
ARC: document memory clobber in irq control macros
ARC: R-M-W assist locks only needed for !LLSC
ARC: add power management options
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/asm/irqflags.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arc/include/asm/irqflags.h b/arch/arc/include/asm/irqflags.h index 742816f..27ecc69 100644 --- a/arch/arc/include/asm/irqflags.h +++ b/arch/arc/include/asm/irqflags.h @@ -41,6 +41,15 @@ /****************************************************************** * IRQ Control Macros + * + * All of them have "memory" clobber (compiler barrier) which is needed to + * ensure that LD/ST requiring irq safetly (R-M-W when LLSC is not available) + * are redone after IRQs are re-enabled (and gcc doesn't reuse stale register) + * + * Noted at the time of Abilis Timer List corruption + * Orig Bug + Rejected solution : https://lkml.org/lkml/2013/3/29/67 + * Reasoning : https://lkml.org/lkml/2013/4/8/15 + * ******************************************************************/ /* |