[PATCH 2/2] x86/unwind/orc: Remove unwind_init() from x86 boot

Huaixin Chang
2020-04-29T06:46:50Z

All preparation has been moved to scripts/sorttable tool. No need to
init unwind on boot now.

Signed-off-by: Huaixin Chang <changhuaixin@linux.alibaba.com>
Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
---
arch/x86/include/asm/unwind.h | 2 --
arch/x86/kernel/setup.c | 2 --
arch/x86/kernel/unwind_orc.c | 51 -------------------------------------------
3 files changed, 55 deletions(-)

diff --git a/arch/x86/include/asm/unwind.h b/arch/x86/include/asm/unwind.h
index 499578f7e6d7..db5aea8c9d98 100644
--- a/arch/x86/include/asm/unwind.h
+++ b/arch/x86/include/asm/unwind.h
@@ -89,11 +89,9 @@ static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state,
#endif

#ifdef CONFIG_UNWINDER_ORC
-void unwind_init(void);
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
void *orc, size_t orc_size);
#else
-static inline void unwind_init(void) {}
static inline
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
void *orc, size_t orc_size) {}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 4b3fa6cd3106..4a17026c6550 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1243,8 +1243,6 @@ void __init setup_arch(char **cmdline_p)
if (efi_enabled(EFI_BOOT))
efi_apply_memmap_quirks();
#endif
-
- unwind_init();
}

#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index e9cc182aa97e..3db43e6e75f2 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -20,7 +20,6 @@ int *cur_orc_ip_table = __start_orc_unwind_ip;
struct orc_entry *cur_orc_table = __start_orc_unwind;

unsigned int lookup_num_blocks;
-bool orc_init;

static inline unsigned long orc_ip(const int *ip)
{
@@ -142,9 +141,6 @@ static struct orc_entry *orc_find(unsigned long ip)
{
static struct orc_entry *orc;

- if (!orc_init)
- return NULL;
-
if (ip == 0)
return &null_orc_entry;

@@ -259,53 +255,6 @@ void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
}
#endif

-void __init unwind_init(void)
-{
- size_t orc_ip_size = (void *)__stop_orc_unwind_ip - (void *)__start_orc_unwind_ip;
- size_t orc_size = (void *)__stop_orc_unwind - (void *)__start_orc_unwind;
- size_t num_entries = orc_ip_size / sizeof(int);
- struct orc_entry *orc;
- int i;
-
- if (!num_entries || orc_ip_size % sizeof(int) != 0 ||
- orc_size % sizeof(struct orc_entry) != 0 ||
- num_entries != orc_size / sizeof(struct orc_entry)) {
- orc_warn("WARNING: Bad or missing .orc_unwind table. Disabling unwinder.\n");
- return;
- }
-
- /*
- * Note, the orc_unwind and orc_unwind_ip tables were already
- * sorted at build time via the 'sorttable' tool.
- * It's ready for binary search straight away, no need to sort it.
- */
-
- /* Initialize the fast lookup table: */
- lookup_num_blocks = orc_lookup_end - orc_lookup;
- for (i = 0; i < lookup_num_blocks-1; i++) {
- orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
- num_entries,
- LOOKUP_START_IP + (LOOKUP_BLOCK_SIZE * i));
- if (!orc) {
- orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
- return;
- }
-
- orc_lookup[i] = orc - __start_orc_unwind;
- }
-
- /* Initialize the ending block: */
- orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind, num_entries,
- LOOKUP_STOP_IP);
- if (!orc) {
- orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
- return;
- }
- orc_lookup[lookup_num_blocks-1] = orc - __start_orc_unwind;
-
- orc_init = true;
-}
-
unsigned long unwind_get_return_address(struct unwind_state *state)
{
if (unwind_done(state))
--
2.14.4.44.g2045bb6