mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 17:46:15 +07:00
e9666d10a5
Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label". The jump label is controlled by HAVE_JUMP_LABEL, which is defined like this: #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) # define HAVE_JUMP_LABEL #endif We can improve this by testing 'asm goto' support in Kconfig, then make JUMP_LABEL depend on CC_HAS_ASM_GOTO. Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will match to the real kernel capability. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2013 Huawei Ltd.
|
|
* Author: Jiang Liu <liuj97@gmail.com>
|
|
*
|
|
* Based on arch/arm/kernel/jump_label.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/jump_label.h>
|
|
#include <asm/insn.h>
|
|
|
|
void arch_jump_label_transform(struct jump_entry *entry,
|
|
enum jump_label_type type)
|
|
{
|
|
void *addr = (void *)jump_entry_code(entry);
|
|
u32 insn;
|
|
|
|
if (type == JUMP_LABEL_JMP) {
|
|
insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry),
|
|
jump_entry_target(entry),
|
|
AARCH64_INSN_BRANCH_NOLINK);
|
|
} else {
|
|
insn = aarch64_insn_gen_nop();
|
|
}
|
|
|
|
aarch64_insn_patch_text_nosync(addr, insn);
|
|
}
|
|
|
|
void arch_jump_label_transform_static(struct jump_entry *entry,
|
|
enum jump_label_type type)
|
|
{
|
|
/*
|
|
* We use the architected A64 NOP in arch_static_branch, so there's no
|
|
* need to patch an identical A64 NOP over the top of it here. The core
|
|
* will call arch_jump_label_transform from a module notifier if the
|
|
* NOP needs to be replaced by a branch.
|
|
*/
|
|
}
|