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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-18 20:57:18 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-18 20:57:18 (GMT) |
commit | d05d82f7110b08fd36178a641b69a1f206e1142b (patch) | |
tree | a274bb136f5ed336fb7a12bb86ea24cc5daffdc9 /arch/tile/include/asm/jump_label.h | |
parent | d90f351a9bec6af3e8e7cefbbff94072461c3c9a (diff) | |
parent | 00d27c6336b00345724b2510f7c5b8cee3055f02 (diff) | |
download | linux-d05d82f7110b08fd36178a641b69a1f206e1142b.tar.xz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
Pull arch/tile updates from Chris Metcalf:
"This is a grab bag of changes that includes some NOHZ and
context-tracking related changes, some debugging improvements,
JUMP_LABEL support, and some fixes for tilepro allmodconfig support.
We also remove the now-unused node_has_online_mem() definitions both
for tile's asm/topology.h as well as in linux/topology.h itself"
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
numa: remove stale node_has_online_mem() define
arch/tile: move user_exit() to early kernel entry sequence
tile: fix bug in setting PT_FLAGS_DISABLE_IRQ on kernel entry
tile: fix tilepro casts for readl, writel, etc
tile: fix a -Wframe-larger-than warning
tile: include the syscall number in the backtrace
MAINTAINERS: add git URL for tile
arch/tile: adopt prepare_exit_to_usermode() model from x86
tile/jump_label: add jump label support for TILE-Gx
tile: define a macro ktext_writable_addr to get writable kernel text address
Diffstat (limited to 'arch/tile/include/asm/jump_label.h')
-rw-r--r-- | arch/tile/include/asm/jump_label.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/tile/include/asm/jump_label.h b/arch/tile/include/asm/jump_label.h new file mode 100644 index 0000000..cde7573 --- /dev/null +++ b/arch/tile/include/asm/jump_label.h @@ -0,0 +1,58 @@ +/* + * Copyright 2015 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_JUMP_LABEL_H +#define _ASM_TILE_JUMP_LABEL_H + +#include <arch/opcode.h> + +#define JUMP_LABEL_NOP_SIZE TILE_BUNDLE_SIZE_IN_BYTES + +static __always_inline bool arch_static_branch(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "nop" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "j %l[l_yes]" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +typedef u64 jump_label_t; + +struct jump_entry { + jump_label_t code; + jump_label_t target; + jump_label_t key; +}; + +#endif /* _ASM_TILE_JUMP_LABEL_H */ |