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0043ecea23
mirror_ubuntu-kernels/arch/sparc/kernel
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Rong Xu 0043ecea23 vmlinux.lds.h: Adjust symbol ordering in text output section 
When the -ffunction-sections compiler option is enabled, each function
is placed in a separate section named .text.function_name rather than
putting all functions in a single .text section.

However, using -function-sections can cause problems with the
linker script. The comments included in include/asm-generic/vmlinux.lds.h
note these issues.:
  “TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
   code elimination is enabled, so these sections should be converted
   to use ".." first.”

It is unclear whether there is a straightforward method for converting
a suffix to "..".

This patch modifies the order of subsections within the text output
section. Specifically, it changes current order:
  .text.hot, .text, .text_unlikely, .text.unknown, .text.asan
to the new order:
  .text.asan, .text.unknown, .text_unlikely, .text.hot, .text

Here is the rationale behind the new layout:

The majority of the code resides in three sections: .text.hot, .text,
and .text.unlikely, with .text.unknown containing a negligible amount.
.text.asan is only generated in ASAN builds.

The primary goal is to group code segments based on their execution
frequency (hotness).

First, we want to place .text.hot adjacent to .text. Since we cannot put
.text.hot after .text (Due to constraints with -ffunction-sections,
placing .text.hot after .text is problematic), we need to put
.text.hot before .text.

Then it comes to .text.unlikely, we cannot put it after .text (same
-ffunction-sections issue) . Therefore, we position .text.unlikely
before .text.hot.

.text.unknown and .tex.asan follow the same logic.

This revised ordering effectively reverses the original arrangement (for
.text.unlikely, .text.unknown, and .tex.asan), maintaining a similar level
of affinity between sections.

It also places .text.hot section at the beginning of a page to better
utilize the TLB entry.

Note that the limitation arises because the linker script employs glob
patterns instead of regular expressions for string matching. While there
is a method to maintain the current order using complex patterns, this
significantly complicates the pattern and increases the likelihood of
errors.

This patch also changes vmlinux.lds.S for the sparc64 architecture to
accommodate specific symbol placement requirements.

Co-developed-by: Han Shen <shenhan@google.com>
Signed-off-by: Han Shen <shenhan@google.com>
Signed-off-by: Rong Xu <xur@google.com>
Suggested-by: Sriraman Tallam <tmsriram@google.com>
Suggested-by: Krzysztof Pszeniczny <kpszeniczny@google.com>
Tested-by: Yonghong Song <yonghong.song@linux.dev>
Tested-by: Yabin Cui <yabinc@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2024-11-27 09:38:27 +09:00
..
syscalls sparc: fix compat recv/recvfrom syscalls 2024-06-25 15:57:25 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
adi_64.c sparc64: Fix prototype warnings in adi_64.c 2024-04-22 15:33:06 +02:00
apc.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
asm-offsets.c arch: fix asm-offsets.c building with -Wmissing-prototypes 2023-11-23 11:32:31 +01:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
auxio_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
auxio_64.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
btext.c sparc: Use shared font data 2024-02-16 16:49:58 +01:00
central.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
cherrs.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chmc.c sparc: chmc: Convert to platform remove callback returning void 2024-04-22 16:51:57 +02:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
cpu.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
cpumap.c sparc: Annotate struct cpuinfo_tree with __counted_by 2023-10-06 13:25:17 -07:00
cpumap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
devices.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ds.c Normalise "name (ad@dr)" MODULE_AUTHORs to "name <ad@dr>" 2024-03-06 13:07:39 -08:00
dtlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dtlb_prot.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ebus.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
entry.h sparc64: Add support for ADI register fields, ASIs and traps 2018-03-18 07:38:45 -07:00
entry.S sparc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-22 18:12:25 +09:00
etrap_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
etrap_64.S sparc64: Add support for ADI (Application Data Integrity) 2018-03-18 07:38:48 -07:00
fpu_traps.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace.c ftrace: Cleanup ftrace_dyn_arch_init() 2021-10-08 19:41:39 -04:00
getsetcc.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head_32.S sparc32: Fix truncated relocation errors when linking large kernels 2024-07-11 15:58:18 +02:00
head_64.S sparc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-22 18:12:25 +09:00
helpers.S treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
hvapi.c sparc64: Oracle DAX infrastructure 2018-01-22 08:17:15 -08:00
hvcalls.S sparc64: Oracle DAX infrastructure 2018-01-22 08:17:15 -08:00
hvtramp.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idprom.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iommu_common.h sparc: remove the mapping_error dma_map_ops method 2018-12-06 06:56:40 -08:00
iommu-common.c dma-mapping: introduce dma_get_seg_boundary_nr_pages() 2020-09-03 18:12:15 +02:00
iommu.c sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR 2021-08-09 17:13:06 +02:00
ioport.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
irq_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
irq_64.c sparc/irq: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
itlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ivec.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
kernel.h sparc64: Fix prototype warning for uprobe_trap 2024-04-22 15:33:06 +02:00
kgdb_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
kgdb_64.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
kprobes.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
kstack.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ktlb.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
ldc.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
led.c proc: make the proc_create[_data]() stubs static inlines 2022-01-20 08:52:52 +02:00
leon_kernel.c sparc/leon: Remove on-stack cpumask var 2024-05-08 19:42:16 +02:00
leon_pci_grpci1.c sparc32: Fix section mismatch in leon_pci_grpci 2024-03-08 21:21:00 +01:00
leon_pci_grpci2.c sparc32: Fix section mismatch in leon_pci_grpci 2024-03-08 21:21:00 +01:00
leon_pci.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
leon_pmc.c arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled 2023-01-13 11:48:15 +01:00
leon_smp.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
Makefile arch: turn off -Werror for architectures with known warnings 2023-12-10 17:21:33 -08:00
mdesc.c sparc: avoid stringop-overread errors 2021-09-15 13:42:33 -07:00
misctrap.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
nmi.c sparc64: NMI watchdog: fix return value of __setup handler 2024-02-16 16:50:25 +01:00
of_device_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
of_device_64.c sparc/of: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
of_device_common.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
of_device_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_common.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_fire.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_impl.h sparc: Fix typos 2024-02-16 16:50:25 +01:00
pci_msi.c sparc/pci_msi: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
pci_psycho.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_sabre.c sparc: Use device_get_match_data() 2024-01-19 08:08:53 -06:00
pci_schizo.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pci_sun4v_asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_sun4v.c sparc64: Fix prototype warning for dma_4v_iotsb_bind 2024-04-22 15:33:06 +02:00
pci_sun4v.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pcic.c PCI: Introduce pci_dev_for_each_resource() 2023-04-04 10:43:52 -05:00
pcr.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
perf_event.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pmc.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
power.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
process_32.c arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled 2023-01-13 11:48:15 +01:00
process_64.c TTY/Serial driver changes for 6.6-rc1 2023-09-01 09:38:00 -07:00
process.c sparc: switch to kernel_clone() 2020-08-20 13:12:58 +02:00
prom_32.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
prom_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
prom_common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
prom_irqtrans.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
prom.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
psycho_common.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
psycho_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ptrace_32.c sparc: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:41 -08:00
ptrace_64.c sparc: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:41 -08:00
reboot.c sparc: Use device_type helpers to access the node type 2018-11-18 13:35:21 -08:00
rtrap_32.S sparc32: Preserve clone syscall flags argument for restarts due to signals 2021-02-18 16:15:11 -08:00
rtrap_64.S context_tracking: Split user tracking Kconfig 2022-06-29 17:04:09 -07:00
sbus.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
setup_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
setup_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
signal32.c x86/shstk: Add user control-protection fault handler 2023-08-02 15:01:50 -07:00
signal_32.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
signal_64.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
sigutil_32.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
sigutil_64.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigutil.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp_32.c treewide: Trace IPIs sent via smp_send_reschedule() 2023-03-24 11:01:28 +01:00
smp_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
sparc_ksyms.c sparc: move exports to definitions 2016-08-07 23:55:43 -04:00
spiterrs.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sstate.c kernel.h: split out panic and oops helpers 2021-07-01 11:06:04 -07:00
stacktrace.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
starfire.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sun4d_irq.c sparc: Use of_node_name_eq for node name comparisons 2018-11-18 13:35:21 -08:00
sun4d_smp.c sparc: Unbreak the build 2022-09-29 19:21:10 -07:00
sun4m_irq.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
sun4m_smp.c sparc: Unbreak the build 2022-09-29 19:21:10 -07:00
sun4v_ivec.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sun4v_mcd.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482 2019-06-19 17:09:52 +02:00
sun4v_tlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys32.S sparc: fix compat recv/recvfrom syscalls 2024-06-25 15:57:25 +02:00
sys_sparc32.c sparc: remove unused header file nfs_fs.h 2020-06-02 18:41:48 -07:00
sys_sparc_32.c mm: make arch_get_unmapped_area() take vm_flags by default 2024-09-09 16:39:13 -07:00
sys_sparc_64.c mm: make arch_get_unmapped_area() take vm_flags by default 2024-09-09 16:39:13 -07:00
syscalls.S sparc64: enable HAVE_COPY_THREAD_TLS 2020-06-23 10:49:54 +02:00
sysfs.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
systbls_32.S sparc: syscalls: switch to generic syscalltbl.sh 2021-05-02 00:43:34 +09:00
systbls_64.S sparc: syscalls: switch to generic syscalltbl.sh 2021-05-02 00:43:34 +09:00
systbls.h sparc: get rid of asm wrapper for nis_syscall() 2018-03-20 12:05:17 -04:00
termios.c termios: start unifying non-UAPI parts of asm/termios.h 2022-09-09 10:44:34 +02:00
time_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
time_64.c sparc64: Fix prototype warning for sched_clock 2024-04-22 15:33:06 +02:00
trampoline_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trampoline_64.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
traps_32.c arch: include linux/cpu.h for trap_init() prototype 2023-11-23 11:32:31 +01:00
traps_64.c sparc64: Fix prototype warnings in traps_64.c 2024-04-22 15:33:06 +02:00
tsb.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttable_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttable_64.S sparc64: Add support for ADI register fields, ASIs and traps 2018-03-18 07:38:45 -07:00
una_asm_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
una_asm_64.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unaligned_32.c signal/sparc: si_trapno is only used with SIGILL ILL_ILLTRP 2021-07-23 13:08:57 -05:00
unaligned_64.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uprobes.c sparc64: Fix prototype warning for uprobe_trap 2024-04-22 15:33:06 +02:00
urtt_fill.S sparc64: Add support for ADI (Application Data Integrity) 2018-03-18 07:38:48 -07:00
utrap.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.c locking/seqlock, headers: Untangle the spaghetti monster 2020-08-06 16:13:13 +02:00
vio.c driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
viohs.c sparc64: viohs: Use struct_size() helper 2020-06-22 15:43:16 -07:00
visemul.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmlinux.lds.S vmlinux.lds.h: Adjust symbol ordering in text output section 2024-11-27 09:38:27 +09:00
windows.c signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-19 09:15:58 -06:00
winfixup.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wof.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wuf.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00