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init/modpost: conditionally check section mismatch to __meminit*

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This reverts commit eb8f689046 ("Use separate sections for __dev/
_cpu/__mem code/data").

Check section mismatch to __meminit* only when CONFIG_MEMORY_HOTPLUG=n.

With this change, the linker script and modpost become simpler, and we
can get rid of the __ref annotations from the memory hotplug code.

[sfr@canb.auug.org.au: remove MEM_KEEP from arch/powerpc/kernel/vmlinux.lds.S]
  Link: https://lkml.kernel.org/r/20240710093213.2aefb25f@canb.auug.org.au
Link: https://lkml.kernel.org/r/20240706160511.2331061-2-masahiroy@kernel.org
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Masahiro Yamada 2024-07-07 01:05:06 +09:00 committed by Andrew Morton
parent 7a7127aa33
commit 73db3abdca
4 changed files with 15 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kernel/vmlinux.lds.S
View File

@ -123,8 +123,6 @@ SECTIONS
*/
*(.sfpr);
*(.text.asan.* .text.tsan.*)
MEM_KEEP(init.text)
MEM_KEEP(exit.text)
} :text
. = ALIGN(PAGE_SIZE);

18
include/asm-generic/vmlinux.lds.h
View File

@ -141,14 +141,6 @@
* often happens at runtime)
*/
#if defined(CONFIG_MEMORY_HOTPLUG)
#define MEM_KEEP(sec) *(.mem##sec)
#define MEM_DISCARD(sec)
#else
#define MEM_KEEP(sec)
#define MEM_DISCARD(sec) *(.mem##sec)
#endif
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries))
#define PATCHABLE_DISCARDS
@ -357,7 +349,6 @@
*(.data..decrypted) \
*(.ref.data) \
*(.data..shared_aligned) /* percpu related */ \
MEM_KEEP(init.data*) \
*(.data.unlikely) \
__start_once = .; \
*(.data.once) \
@ -542,7 +533,6 @@
/* __*init sections */ \
__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
*(.ref.rodata) \
MEM_KEEP(init.rodata) \
} \
\
/* Built-in module parameters. */ \
@ -593,8 +583,7 @@
*(.text.unknown .text.unknown.*) \
NOINSTR_TEXT \
*(.ref.text) \
*(.text.asan.* .text.tsan.*) \
MEM_KEEP(init.text*) \
*(.text.asan.* .text.tsan.*)
/* sched.text is aling to function alignment to secure we have same
@ -701,7 +690,6 @@
#define INIT_DATA \
KEEP(*(SORT(___kentry+*))) \
*(.init.data .init.data.*) \
MEM_DISCARD(init.data*) \
KERNEL_CTORS() \
MCOUNT_REC() \
*(.init.rodata .init.rodata.*) \
@ -709,7 +697,6 @@
TRACE_SYSCALLS() \
KPROBE_BLACKLIST() \
ERROR_INJECT_WHITELIST() \
MEM_DISCARD(init.rodata) \
CLK_OF_TABLES() \
RESERVEDMEM_OF_TABLES() \
TIMER_OF_TABLES() \
@ -727,8 +714,7 @@
#define INIT_TEXT \
*(.init.text .init.text.*) \
*(.text.startup) \
MEM_DISCARD(init.text*)
*(.text.startup)
#define EXIT_DATA \
*(.exit.data .exit.data.*) \

14
include/linux/init.h
View File

@ -84,11 +84,15 @@
#define __exit __section(".exit.text") __exitused __cold notrace
/* Used for MEMORY_HOTPLUG */
#define __meminit __section(".meminit.text") __cold notrace \
__latent_entropy
#define __meminitdata __section(".meminit.data")
#define __meminitconst __section(".meminit.rodata")
#ifdef CONFIG_MEMORY_HOTPLUG
#define __meminit
#define __meminitdata
#define __meminitconst
#else
#define __meminit __init
#define __meminitdata __initdata
#define __meminitconst __initconst
#endif
/* For assembly routines */
#define __HEAD .section ".head.text","ax"

19
scripts/mod/modpost.c
View File

@ -776,17 +776,14 @@ static void check_section(const char *modname, struct elf_info *elf,
#define ALL_INIT_DATA_SECTIONS \
".init.setup", ".init.rodata", ".meminit.rodata", \
".init.data", ".meminit.data"
".init.setup", ".init.rodata", ".init.data"
#define ALL_PCI_INIT_SECTIONS \
".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
".pci_fixup_enable", ".pci_fixup_resume", \
".pci_fixup_resume_early", ".pci_fixup_suspend"
#define ALL_XXXINIT_SECTIONS ".meminit.*"
#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
#define ALL_INIT_SECTIONS ".init.*"
#define ALL_EXIT_SECTIONS ".exit.*"
#define DATA_SECTIONS ".data", ".data.rel"
@ -797,9 +794,7 @@ static void check_section(const char *modname, struct elf_info *elf,
".fixup", ".entry.text", ".exception.text", \
".coldtext", ".softirqentry.text"
#define INIT_SECTIONS ".init.*"
#define ALL_TEXT_SECTIONS ".init.text", ".meminit.text", ".exit.text", \
#define ALL_TEXT_SECTIONS ".init.text", ".exit.text", \
TEXT_SECTIONS, OTHER_TEXT_SECTIONS
enum mismatch {
@ -839,12 +834,6 @@ static const struct sectioncheck sectioncheck[] = {
.bad_tosec = { ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL },
.mismatch = TEXTDATA_TO_ANY_INIT_EXIT,
},
/* Do not reference init code/data from meminit code/data */
{
.fromsec = { ALL_XXXINIT_SECTIONS, NULL },
.bad_tosec = { INIT_SECTIONS, NULL },
.mismatch = XXXINIT_TO_SOME_INIT,
},
/* Do not use exit code/data from init code */
{
.fromsec = { ALL_INIT_SECTIONS, NULL },
@ -859,7 +848,7 @@ static const struct sectioncheck sectioncheck[] = {
},
{
.fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
.bad_tosec = { INIT_SECTIONS, NULL },
.bad_tosec = { ALL_INIT_SECTIONS, NULL },
.mismatch = ANY_INIT_TO_ANY_EXIT,
},
{