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ARM: 7862/1: pcpu: replace __get_cpu_var_uses

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This is the ARM part of Christoph's patchset cleaning up the various
uses of __get_cpu_var across the tree.

The idea is to convert __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations
that use the offset. Thereby address calculations are avoided and fewer
registers are used when code is generated.

[will: fixed debug ref counting checks and pcpu array accesses]

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Christoph Lameter
2013-10-21 13:17:08 +01:00
committed by Russell King
parent 39792c7cf3
commit 1436c1aa62
7 changed files with 34 additions and 35 deletions
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22
arch/arm64/kernel/hw_breakpoint.c
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@@ -184,14 +184,14 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
/* Breakpoint */
ctrl_reg = AARCH64_DBG_REG_BCR;
val_reg = AARCH64_DBG_REG_BVR;
slots = __get_cpu_var(bp_on_reg);
slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
reg_enable = !debug_info->bps_disabled;
} else {
/* Watchpoint */
ctrl_reg = AARCH64_DBG_REG_WCR;
val_reg = AARCH64_DBG_REG_WVR;
slots = __get_cpu_var(wp_on_reg);
slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
reg_enable = !debug_info->wps_disabled;
}
@@ -230,12 +230,12 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
/* Breakpoint */
base = AARCH64_DBG_REG_BCR;
slots = __get_cpu_var(bp_on_reg);
slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
} else {
/* Watchpoint */
base = AARCH64_DBG_REG_WCR;
slots = __get_cpu_var(wp_on_reg);
slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
}
@@ -505,11 +505,11 @@ static void toggle_bp_registers(int reg, enum debug_el el, int enable)
switch (reg) {
case AARCH64_DBG_REG_BCR:
slots = __get_cpu_var(bp_on_reg);
slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
break;
case AARCH64_DBG_REG_WCR:
slots = __get_cpu_var(wp_on_reg);
slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
break;
default:
@@ -546,7 +546,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr,
struct debug_info *debug_info;
struct arch_hw_breakpoint_ctrl ctrl;
slots = (struct perf_event **)__get_cpu_var(bp_on_reg);
slots = this_cpu_ptr(bp_on_reg);
addr = instruction_pointer(regs);
debug_info = &current->thread.debug;
@@ -596,7 +596,7 @@ unlock:
user_enable_single_step(current);
} else {
toggle_bp_registers(AARCH64_DBG_REG_BCR, DBG_ACTIVE_EL1, 0);
kernel_step = &__get_cpu_var(stepping_kernel_bp);
kernel_step = this_cpu_ptr(&stepping_kernel_bp);
if (*kernel_step != ARM_KERNEL_STEP_NONE)
return 0;
@@ -623,7 +623,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr,
struct arch_hw_breakpoint *info;
struct arch_hw_breakpoint_ctrl ctrl;
slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
slots = this_cpu_ptr(wp_on_reg);
debug_info = &current->thread.debug;
for (i = 0; i < core_num_wrps; ++i) {
@@ -698,7 +698,7 @@ unlock:
user_enable_single_step(current);
} else {
toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL1, 0);
kernel_step = &__get_cpu_var(stepping_kernel_bp);
kernel_step = this_cpu_ptr(&stepping_kernel_bp);
if (*kernel_step != ARM_KERNEL_STEP_NONE)
return 0;
@@ -722,7 +722,7 @@ int reinstall_suspended_bps(struct pt_regs *regs)
struct debug_info *debug_info = &current->thread.debug;
int handled_exception = 0, *kernel_step;
kernel_step = &__get_cpu_var(stepping_kernel_bp);
kernel_step = this_cpu_ptr(&stepping_kernel_bp);
/*
* Called from single-step exception handler.