/** * @file backtrace.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon * @author David Smith * Modified for Xen by Amitabha Roy * */ #include #include #include #include struct frame_head { struct frame_head * ebp; unsigned long ret; } __attribute__((packed)); static struct frame_head * dump_hypervisor_backtrace(struct domain *d, struct vcpu *vcpu, struct frame_head * head, int mode) { if (!xenoprof_add_trace(d, vcpu, head->ret, mode)) return 0; /* frame pointers should strictly progress back up the stack * (towards higher addresses) */ if (head >= head->ebp) return NULL; return head->ebp; } static struct frame_head * dump_guest_backtrace(struct domain *d, struct vcpu *vcpu, struct frame_head * head, int mode) { struct frame_head bufhead[2]; XEN_GUEST_HANDLE(char) guest_head = guest_handle_from_ptr(head, char); /* Also check accessibility of one struct frame_head beyond */ if (!guest_handle_okay(guest_head, sizeof(bufhead))) return 0; if (__copy_from_guest_offset((char *)bufhead, guest_head, 0, sizeof(bufhead))) return 0; if (!xenoprof_add_trace(d, vcpu, bufhead[0].ret, mode)) return 0; /* frame pointers should strictly progress back up the stack * (towards higher addresses) */ if (head >= bufhead[0].ebp) return NULL; return bufhead[0].ebp; } /* * | | /\ Higher addresses * | | * --------------- stack base (address of current_thread_info) * | thread info | * . . * | stack | * --------------- saved regs->ebp value if valid (frame_head address) * . . * --------------- saved regs->rsp value if x86_64 * | | * --------------- struct pt_regs * stored on stack if 32-bit * | | * . . * | | * --------------- %esp * | | * | | \/ Lower addresses * * Thus, regs (or regs->rsp for x86_64) <-> stack base restricts the * valid(ish) ebp values. Note: (1) for x86_64, NMI and several other * exceptions use special stacks, maintained by the interrupt stack table * (IST). These stacks are set up in trap_init() in * arch/x86_64/kernel/traps.c. Thus, for x86_64, regs now does not point * to the kernel stack; instead, it points to some location on the NMI * stack. On the other hand, regs->rsp is the stack pointer saved when the * NMI occurred. (2) For 32-bit, regs->esp is not valid because the * processor does not save %esp on the kernel stack when interrupts occur * in the kernel mode. */ #if defined(CONFIG_FRAME_POINTER) static int valid_hypervisor_stack(struct frame_head * head, struct cpu_user_regs * regs) { unsigned long headaddr = (unsigned long)head; #ifdef CONFIG_X86_64 unsigned long stack = (unsigned long)regs->rsp; #else unsigned long stack = (unsigned long)regs; #endif unsigned long stack_base = (stack & ~(STACK_SIZE - 1)) + STACK_SIZE; return headaddr > stack && headaddr < stack_base; } #else /* without fp, it's just junk */ static int valid_hypervisor_stack(struct frame_head * head, struct cpu_user_regs * regs) { return 0; } #endif void xenoprof_backtrace(struct domain *d, struct vcpu *vcpu, struct cpu_user_regs * const regs, unsigned long depth, int mode) { struct frame_head *head; head = (struct frame_head *)regs->ebp; if (mode > 1) { while (depth-- && valid_hypervisor_stack(head, regs)) head = dump_hypervisor_backtrace(d, vcpu, head, mode); return; } while (depth-- && head) head = dump_guest_backtrace(d, vcpu, head, mode); } t/upstream/tree/target/linux/generic/hack-4.9?id=252c8ddf146f196faaa34cf7af9b3eacb79e6add'>hack-4.9/259-regmap_dynamic.patch
blob: 85c9d791593dbe64e954cb95635236ae03e4818c (plain) 
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From 811d9e2268a62b830cfe93cd8bc929afcb8b198b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Sat, 15 Jul 2017 21:12:38 +0200
Subject: kernel: move regmap bloat out of the kernel image if it is only being used in modules

lede-commit: 96f39119815028073583e4fca3a9c5fe9141e998
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/base/regmap/Kconfig  | 15 ++++++++++-----
 drivers/base/regmap/Makefile | 12 ++++++++----
 drivers/base/regmap/regmap.c |  3 +++
 include/linux/regmap.h       |  2 +-
 4 files changed, 22 insertions(+), 10 deletions(-)

--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -3,9 +3,8 @@
 # subsystems should select the appropriate symbols.
 
 config REGMAP
-	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
 	select IRQ_DOMAIN if REGMAP_IRQ
-	bool
+	tristate "Regmap"
 
 config REGCACHE_COMPRESSED
 	select LZO_COMPRESS
@@ -16,19 +15,25 @@ config REGMAP_AC97
 	tristate
 
 config REGMAP_I2C
-	tristate
+	tristate "Regmap I2C"
+	select REGMAP
 	depends on I2C
 
 config REGMAP_SPI
-	tristate
+	tristate "Regmap SPI"
+	select REGMAP
+	depends on SPI_MASTER
 	depends on SPI
 
 config REGMAP_SPMI
+	select REGMAP
 	tristate
 	depends on SPMI
 
 config REGMAP_MMIO
-	tristate
+	tristate "Regmap MMIO"
+	select REGMAP
 
 config REGMAP_IRQ
+	select REGMAP
 	bool
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -1,10 +1,14 @@
 # For include/trace/define_trace.h to include trace.h
 CFLAGS_regmap.o := -I$(src)
 
-obj-$(CONFIG_REGMAP) += regmap.o regcache.o
-obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
-obj-$(CONFIG_REGCACHE_COMPRESSED) += regcache-lzo.o
-obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
+regmap-core-objs = regmap.o regcache.o regcache-rbtree.o regcache-flat.o
+ifdef CONFIG_DEBUG_FS
+regmap-core-objs += regmap-debugfs.o
+endif
+ifdef CONFIG_REGCACHE_COMPRESSED
+regmap-core-objs += regcache-lzo.o
+endif
+obj-$(CONFIG_REGMAP) += regmap-core.o
 obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
 obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
 obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -13,6 +13,7 @@
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/export.h>
+#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <linux/of.h>
@@ -2913,3 +2914,5 @@ static int __init regmap_initcall(void)
 	return 0;
 }
 postcore_initcall(regmap_initcall);
+
+MODULE_LICENSE("GPL");
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -135,7 +135,7 @@ struct reg_sequence {
 	pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
 })
 
-#ifdef CONFIG_REGMAP
+#if IS_ENABLED(CONFIG_REGMAP)
 
 enum regmap_endian {
 	/* Unspecified -> 0 -> Backwards compatible default */
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-17 04:21:15 +0000